Djvu ransomware – a malware family of over 250 members that expands weekly
Djvu ransomware is a risky file locking cyber threat which adds the .djvu, .djvus, .tfude, .adobe or .pdff appendix to each blocked document and displays the _openme.txt ransom message.
Djvu, also known as .djvu files virus, is a crypto-malware variant that belongs to one of the most prominent ransomware families – STOP. The infections started spreading around in December 2018, and the success of the strain encouraged its developers to expand their operation and release sub-variants regularly. As soon as Djvu ransomware infects the host machine, it applies a proper AES or another asymmetric encryption algorithm to lock up pictures, videos, music, document, and other files.
Users can immediately spot the infection as all their files are appended with particular extensions that indicate the name of the virus, in most cases. To achieve a prompt result, Djvu ransomware virus modifies various system files and deletes Shadow Volume Copies to prevent recovery, alters Windows registry entries and other system files to interfere with particular data recovery and security functions. It is also known that the virus created all alters host files to keep users from security sites and AV tool providers.
Note that numerous expert teams are working really hard on closing the virus, so you can store encrypted files and other data related to the cryptovirus on your computer and wait for the decryption tool. It is especially difficult and takes time, so rely on malware removal, do not expect to get your files back easily. This is a known family that keeps on releasing new versions every few weeks. The recent times in 2020 shows extremely active criminals because new versions come out pretty much every week. The most recent ones being .pezi, .zipe, .nlah, .zwer, .kuus, .erif .mmpa, .efji and .iiss which share many similarities with the other ones released the same year.
Researches have disabled the previously known decryption tool STOPDecrypter that worked for many variants before August 2019. Some of the versions can be decrypted still but the fact that can indicate whether or not your files can get decrypted is online or offline keys. Victims' IDs get generated for each victim, so when online keys are used those IDs are unique for each person and the device. This means that there are tons of different decryption keys too.
Questions about Djvu ransomware
When offline IDs are used, there are many similar IDs because there is no connection to the remote server and each version with the same file extension on encoded files has the same identification key. If you see t1 at the end of your ID in the ransom note, you may have the opportunity to get those files restored, but there are no Djvu decryption tools besides Emsisoft decrypted that works with offline keys only.
|Appendixes||.djvu, .djvus, .djvuu, .udjvu, .uudjvu, .djvuq, .djvur, .pdff, .tro, .tfude, .tfudeq, .tfudet, .adobe, .adobee, .blower, .promorad, .promock, .bufas, .dotmap, .sarut, .verasto, .seto, .peta, .karl, .kvag, .nesa, .mado, . jope, .nopsk, .opqz, .mpaj, .lalo, .lezp, .qewe, .mpal., .sqpc, .koti, .covm, .pezi, .zipe, .nlah, .usam, .tabe, .moba, .pykw, .zida, .maas, .repl, .kuus, .erif, .kook, .nile, .oonn, .vari, .boop, .geno, .kasp, .ogdo, .npph, .kolz, .copa, .lyli, .moss, .foqe, .mmpa, .efji, .nypg, etc.|
|Ransom message||_openme.txt, _readme.txt files appear on the desktop after the file encryption process. These ransom notes contain message about the encryption and further details|
|Contact email examples||
|About the ransom||Crooks offer a 50% discount for the price if the victims contact them in 72 hours. However, this is created to fake trust between criminals and victims|
|System modification||The virus also deletes shadow volume copies, modifies windows registry, starts/stops various processes, creates scheduled tasks, etc.|
|Distribution techniques||Rogue email attachments, cracks, and keygens, adware bundles. In most cases, this ransomware family distributes its versions via torrent sites and services using infected files placed in software crack packages (cracked software, Video games, and so on)|
|Virus removal||Djvu ransomware termination requires anti-malware tools that can detect the threat and have updated databases of malware. This is the most important step because you cannot recover files on the insecure system|
|Decryptable?||Some versions are decryptable. You can try this decryption tool to check if your versions are older or use the offline IDs. In other cases, threat affects files in a more significant way and files are not decryptable|
|Repair process||ReimageIntego program is required to fight malicious files and fix virus damage completely|
While, initially, it was not much known about Djvu ransomware distribution, researchers spotted that victims let the virus into their systems after downloading and executing the so-called software cracks or keygens. These tools allow users to use the paid software for free, although they are often laden with malware. These cracks and cheats are typically available on torrent sites and remain the main vector for Djvu distribution, especially for the last versions.
As soon as the encryption process is complete, users are introduced with a ransom note which is usually named _readme.txt or _openme.txt. The message from hackers behind the Djvu virus claims that victims have to pay up for the file recovery tool that they would allegedly provide as soon as the payment (as a general rule, $980/$490 in BTC is asked) is processed.
Some of the first Djvu ransomware variants are entirely decryptable with the STOPDecrypter – a decryption tool created by Michael Gillespie. Later variants, however, might not be as easy to crack. Nevertheless, later versions can sometimes be decoded if the encryption process was performed when the malware was unable to contact its C&C server or the host machine was disconnected from the internet. Regardless of which Djvu virus version you are affected by, paying the ransom is never recommended, as a possibility of being scammed prevails.
After spreading on the Internet for several weeks, the ransomware came back with the Djvus virus version. It is the same file-encrypting virus that uses unique encryption algorithms to lock up important documents that are found on the infected PC. In this case, the hackers are using the RSA encryption algorithm.
Even though the decryption might be hard to perform even for the highly-experienced users (you cannot guess this key or find it on the Internet), there is no need for rushing to pay the criminals. Note that, these people often try to scam their victims by providing them false promises. We suggest taking a look at some data recovery methods that we have provided below this article.
No matter which virus version you are dealing with, the ransom warning stays the same. As you can see from the message body, no particular details about the money are given in the ransom note. However, victims have reported that they were asked to pay from $350 to $500 for the decryption of encrypted data:
———————— ALL YOUR FILES ARE ENCRYPTED ————————
Don't worry, you can return all your files!
All your files documents, photos, databases and other important are encrypted with strongest encryption and unique key.
The only method of recovering files is to purchase decrypt tool and unique key for you.
This software will decrypt all your encrypted files.
What guarantees do we give to you?
You can send one of your encrypted file from your PC and we decrypt it for free.
But we can decrypt only 1 file for free. File must not contain valuable information
Don't try to use third-party decrypt tools because it will destroy your files.
Discount 50% available if you contact us first 72 hours.
To get this software you need write on our e-mail:
Reserve e-mail address to contact us:
Your personal ID:
Crooks who spread viruses such as Djvu ransomware are most likely to urge for cryptocurrencies only. The most popular demanded currency is Bitcoin as it is commonly used worldwide. Hackers urge for this type of ransom because cryptocurrency transfers do not require any specific personal details, and because of that, the process remains completely untrackable. This lets the crooks to scam victims easily without the risk of getting caught.
Djvu virus - ransomware which can enter the computer system via spam email messages and their rogue attachments.
If you are seeking to recover your encrypted data, remove Djvu ransomware virus first before that. If you do not proceed with these actions in the right order, your files might be encrypted again after the next computer boot as the cyber threat will still remain in the computer system. Next time, make sure you take care of your data's safety properly. A piece of advice would be to store it on a remote server or device which is accessible only for you. This way no other person will be able to reach that data.
Performing the Djvu ransomware removal requires a lot of attention. That is why you need to leave the process for reliable anti-malware computer software. However, we suggest using a program such as ReimageIntego to detect all malware-related content that might create issues in the PC system. If all hazardous components are successfully removed, the ransomware virus should not return to your computer after the process.
One more thing you need to know about Djvu files virus: this file locker can inject malicious components anywhere in the system, furthermore, it can clean paths for other malware to distribute easily, delete Shadow Volume Copies of encrypted documents, and add unwanted content to the Windows Registry. Once you spot this threat, make sure you get rid of it ASAP.
To recover files encrypted by Djvu ransomware, try the STOPDecrypter from DemonSlay335. According to the researcher, the program is not ready to recover all encrypted files. At the moment, it works only for this personal ID: 6se9RaIxXF9m70zWmx7nL3bVRp691w4SNY8UCir0 which is generated while your computer is off. Take into account that if you try to add invented numbers can result in a complete loss of your encrypted data.
Djvu ransomware infection stages
Djvu ransomware infection progression is multi-stage, and there are several steps that it performs as soon as it is able to get into the machine's system. The primary executable installs into the LocalAppData and then downloads several additional files: 1.exe, 2.exe, 3.exe, and pdatewin.exe. All of these executables serve different functions:
- 1.exe is used to disable various features and functionalities within Windows Defender. Additionally, the file launches a PowerShell script called Script.ps1 which disables Defender's real-time protection feature;
- 2.exe modifies Windows' HOSTS file by adding multiple security site URLs, preventing users from navigating there and seeking for help;
- 3.exe's functionality is not yet identified.
After these processes are complete, Djvu ransomware will contact the C2 server, providing hackers with the unique ID that is based on the victims' MAC address. The remote server then responds with the encryption key that is used to encode all personal files. During data encryption, the Djvu virus launches a fake Windows Update window (spawned by pdatewin.exe) so that the victim would not suspect anything.
Finally, Djvu ransomware will append the appropriate file extension, depending on the virus version. For example, a file called picture.jpg will be turned into picture.jpg.djvu and will become inaccessible for users. Additionally, an _openme.txt ransom note is inserted into each of the affected folders.
Once the encryption process is complete, malware will create a scheduled task called Time Trigger Task that will periodically encrypt newly-added files.
During file encryption process, Djvu ransomware runs fake Windows Update window
Djvu virus versions explained
Djvu virus was spotted on the internet in the late end of 2018. Malware researchers have identified it as one of STOP ransomware versions. However, together with the new year, the ransomware virus started using new file markers to help users find encrypted files among the untouched ones. The ransom note file is still named as _openme.txt and is placed in every folder with the encrypted data. Below you can find more information about each version:
Djvus file ransomware came out right before the New Year. While virus developers haven't changed the virus much, we can see that the email address is firstname.lastname@example.org. In addition, the virus is still offering 50% discount for those who contact its developers within 72 hours. Unfortunately, people have reported numerous cases when they found this virus on their computer system, cloud services, and even hard drives which were connected to the compromised system without much thinking. While some versions of STOP ransomware can be decrypted, unfortunately, this is not applied to the Djvus virus.
Djvuu ransomware was discovered back in December 2018. As the name suggests, it is appending the previously mentioned extension to affect users' personal data. The ransom note displayed in a text file is still named _openme.txt and displays the message encouraging victims to contact these criminals via email and contact addresses: email@example.com and firstname.lastname@example.org. Djvuu virus is not decryptable, so you should use your files' backups to recover encrypted data. The virus is using RSA encryption method to make files useless. The private keys are stored on hackers' servers.
Uudjvu ransomware is a slightly different version of the same Djvu virus that appears on the targeted system by using the common PirateBay setup window and this way attempts to steal user's credentials from various accounts to use them in later scams. Developers created this variant without a ransom demand but files on the computer still get encrypted by using AES and RSA mix. The affected part of the files is marked with .uudjvu file appendix. We don't recommend contacting hackers for their ransomware demands as you can be left with more damage on your computer. Remove the virus at first and then continue with the recovery of your files. Use backups or third-party software in this stage.
Uudjvu ransomware was almost identical to the original - Djvu - version of the virus
Djvuq ransomware is one of the versions that are more similar to the initial Djvu virus. It also encrypts files using the algorithm and marks encoded photos, documents, or even archives with .djvuq at the end. Ransom note, in this case, also gets placed in the _openme.txt file with the discount deal on the ransom and previously used contact emails email@example.com and firstname.lastname@example.org.
Udjvuq file ransomware also appeared in December 2018 following previous identical versions. Cybercriminals behind the threat still focus on the encryption and file marking process with extortion purposes. However, ransom note states about the only way to recover the files – pay up. According to developers, other decryption tools cannot give you the needed results, so they give you a half-off for the ransom if you contact them in the first 72h. These details alongside the same email addresses are delivered in the file _openme.txt.
Tfude ransomware is one of the numerous versions of Djvu virus. Being split into several versions as well (.tfude, .tfudeq, .tfudet), the virus is actively trying to overcome computers' protection and install its malicious executable. Once active, malware encrypts files and drops _openme.txt ransom note. Unfortunately, even if your computer is offline, the virus can still continue the encryption of your files.
Additionally, cybercriminals are asking to use email@example.com or firstname.lastname@example.org email addresses to reach them for files' decryption. However, making any contact with these criminals can result in money loss. If your personal ID consists of these numbers, you should be capable of using the decryptor given at the end of this post: 6se9RaIxXF9m70zWmx7nL3bVRp691w4SNY8UCir0
Pdff ransomware also uses AES encryption algorithm to encrypt files and was first spotted in January 2019 attacking computer users from the Middle-East. Nevertheless, the ransom note _openme.txt remains to be written in the English language and contains almost identical text that is typical for Djvu file virus infection.
However, this time crooks ask users to contact them with the help of email@example.com and firstname.lastname@example.org email addresses. Another difference from the previous variants seems to be the file extension that is added – .pdff. While this version is not decryptable yet, we suggest you remove Pdff ransomware and use alternative file recovery methods.
Tro ransomware was observed on the web just a day after Pdff ransomware came out. It was spotted being distributed with the help of cracks, keygens, or bundled software that includes adware applications.
As soon as the virus enters the machine, it encrypts all the available data (skipping system files) with the help of a secure encryption algorithm and adds .tro file extension. This time it seems that the extension is the only difference compared to its previous versions, as the ransom note is called _openme.txt and the contact emails are email@example.com and firstname.lastname@example.org.
The two latest variants of Djvu ransomware are .tro and .pdff, which share same contact address.
.adobe file extension has first been introduced by an infamous Dharma ransomware. However, Djvu ransomware has also started using this extension after encrypting the victim's files and making them useless. After some time, it was changed to .adobee. The virus is still using email@example.com as the default email address which should be used by victims to contact hackers for the ransom.
Unfortunately, no matter some of the previous versions can be recovered by using STOPDecrypter, .adobe hasn't been added to this tool's database yet. If infected, keep checking this post and hope that security researchers will soon find a cure for this malware.
As we can see, Djvu ransomware has A LOT of other versions, the cybercriminals have released another variant lately. This one is familiar with the Adobe ransomware, however, with two e's (Adobee). It has the same operating principle. Once installed, the ransomware virus injects malicious content in the system and performs the encryption. After that, files appear with the .adobee appendix and are blocked from any access.
Additionally, Adobee ransomware, just like other Djvu versions, provides a ransom message named _openme.txt. The note shows up in the Notepad. Crooks urge for some money in order to receive the decryption tool. They provide firstname.lastname@example.org and pdfhelp@ firemail.cc email addresses as a way to make contact.
Blower ransomware can enter the PC secretly just like others of its kind, for example, through infected hyperlinks, harmful attachments, etc. Once it is installed, rogue and harmful content is injected into the system and malicious activities such as data encryption are performed.
Blower is appending the .blower file extension to each encrypted file. This ransomware virus is capable of locking all kinds of data such as images, audio files, video, text documents, databases, excel sheets, PowerPoint, and others. Once the encryption is performed, crooks notify their users through a text message named _readme.txt. Two emails are provided in this message: email@example.com, firstname.lastname@example.org. We suggest you avoid any contact with these cruel people.
Norvas virus is a crypto-malware that is using the same _readme.txt ransom note to swindle the money from users worldwide. It is an easy task because before that the virus changes the code of target files and then appends the special extension called .norvas to every piece of data that was affected. In this case, files become useless and cannot be used as previously.
The developers of Norvas ransomware can be reached via email@example.com and firstname.lastname@example.org email addresses. They also offer to provide the 50% discount for the ransom if they are contacted within 24 hours. However, do NOT believe these people as they are notorious scammers stealing users' money.
Grovat is using AES-256 encryption code to make users' data useless. Additionally, the victim is required to make a special payment to a secret bitcoin wallet in exchange for the decryption code. Email addresses users are typically pointed to are called either email@example.com or firstname.lastname@example.org. These addresses should be used to contact cybercriminals and get the bitcoin address for the payment. However, we do NOT recommend making any contact with these people.
To generate a unique identifier along with the decryption code assigned for each user, malware contacts its C&C server. The ransom note is called like any other used by other Djvu versions – _readme.txt. You should remove all files that belong to this malware instead of contacting cybercriminals. To recover your files, you can try using STOPDecrypter.
As soon as Grovat ransomware encrypts files, they impossible to open
Verasto was first spotted at the end of April 2019 and, since its release, it has been infecting hundreds of users all over the world, remains one of the most prevalent Djvu virus variants to date.
Just as its predecessors, Verasto ransomware uses various propagation techniques, including:
- Spam emails;
- Software cracks or keygens;
- Fake updates;
- Backdoor, etc.
After its infiltration, the malware scans the device looking for a variety of most popular file types, such as .jpg, .mpeg, .xlsx, .html, .zip, .php, and others, and appends .verasto markings. Nevertheless, the virus avoids encrypting the most crucial system files (although it does modify certain OS files and settings), along with executables as they are not considered to be valuable.
Unfortunately, data locked in such a way requires a unique key that is secured on a remote server controlled by hackers. They offer a decryption tool for a $980/$490 payment in Bitcoins. Experts recommend avoiding paying criminals, however, as the chance of getting scammed remains quite high. Instead, remove Verasto ransomware and use alternative data recovery methods as per the instructions below.
One of many versions in the family that came out in April 2019, Hrosas ransomware still includes the same emails as previous versions. email@example.com, firstname.lastname@example.org remains the primary method to contact people behind this virus, and criminals provide another method – Telegram account.
Also, as typical for this family, ransom note comes in the text file _readme.txt and politely asks to pay up with the discount offer. Besides this version, on the same day, researchers discovered a file-locker virus that marks data using .kiratos extension, but not many samples got revealed and it may not be that widely spread as other ones.
As known for a while, the STOP decryption tool worked for many versions, including the previous to this Todarius ransomware variant. However, many user reports and sample analysis revealed that there is a patch in the version, so decryption is not possible, unfortunately.
It seems that once the STOP decrypter is run, the extension changes to .kiratos, and 0 files are decrypted. it happens with a few updated versions of this tool, so it is allowed to say that .todarius file extension marked files are not decryptable. This and new email added to the mix – email@example.com, are the only unique features for the variant.
Hofos ransomware came soon after the Todarius version, at the same time like .dutan and .roldat versions that remained not that active. However, Hofos files virus was yet again slightly unique than other ones, as user samples showed. marking the 74th version of the Djvu ransomware it comes with the same already known ransom note file _readme.txt and recently renewed email addresses – firstname.lastname@example.org, email@example.com.
The distribution of the malware includes packs of software spread around in public torrent sites. Multiple users reported that particular subtitle packs and Sony Vegas 16 plugin delivered an executable with a malicious payload. This version is probably the one that started a tendency for Djvu creators because since .hofos the main vector remained cracks and other pirated data.
The first version of the month of May, Sarut ransomware came alongside other variants like .fedasot, .berost, .forasom, .fordan. The few added another email to the mix – firstname.lastname@example.org that got used in latter versions from time to time, but not as the primary contact email.
As given from the name, this version encrypts files with a .sarut file marker, and developers still use offline keys for the file locking, so many victims can get their files back with STOP decrypter. Djvu developers seemed to sleep on their money gotten from victims and focusing on these continuous releases without making any crucial changes to the coding.
At the same time as not so unique versions .codnat, .codnat1, .bufas, .dotmap, .radman and .rectot came out Ferosas ransomware that is yet another version in Djvu family that cannot be easily decrypted with the STOP decryption tool or other programs offered by programmers or researchers.
These versions included a mix of contact emails with more uncommon email@example.com, firstname.lastname@example.org. However, the same ransom note, ransom amount, and encryption methods, so offline keys still help to decrypt files or at least some of them. The distribution remains focusing around software cracks and torrent files. Particular versions were reportedly included in packs with Sony Vegas application cracks and other software.
Skymap ransomware came out in the summer alongside .mogera, .rezuc, .stone, .redmat, .lanset, .davda, .poret. A few of them got more active than others ad can be identified from a new contact email email@example.com. However, .skymap was the one that got more attention from researchers due to user samples and reports.
Nevertheless, these all versions can be decrypted because developers use offline keys for encryption mainly. Still, the main vector remains serial numbers, cracks and other illegal files delivered via torrent sites.
July was not the biggest month for Djvu ransomware because Heroset ransomware and .pidon, .boston, .muslat, .gerosan, .vesad, .horon, .neras, .truke variants that came out this month all were almost identical. firstname.lastname@example.org, email@example.com emails, _readme.txt ransom note ant the same discount offer to lower $980 to $490 remained unchanged.
Although the versions seem to be more persistent and making all the changes in the system folders, STOP Decrypter with needed updates works perfectly for files locked using offline keys. However, during this time it was revealed that besides encryption processes, Djvu delivers AZORult malware as a secondary payload.
Summer of 2019 was big for Djvu virus, which is uncommon in the ransomware world because developers mainly rest during the season. However, Litar ransomware and .dalle, .lotep, .nusar, .besub, .cezor, .lokas, .godes, .budak, .vusad, .herad, .berosuce, .gehad, .gusau all got released in a span of three weeks.
Although some of them got more popular than others, all can be decrypted with a proper version of the decryption tool. Developers still trying to calm people by stating “don't worry” but scaring them with a claim that there are no other options besides paying the ransom. At this point, decryption is possible for files locked using offline keys and there is no need to panic or pay the demanded amount.
Starting with Madek ransomware, creators released a new version a day up until the very end of August. Not developing anything new, criminals wanted to infect as many systems as possible due to positive results with the decryption tool developed by Michael Gillespie. Not many things get to be changed, as usual. Gorentos@bitmessage.ch, firstname.lastname@example.org still remain default contact emails for many versions of file markers.
Although those last few weeks were extremely active for developers, versions were decryptable yet again. However, Gero ransomware release changed everything. Encryption method and coding were changed, and developers started to use the proper asymmetric file-locking algorithm. This fact made STOP virus decrypter useless, in most cases because offline keys cannot be used. During this time, email@example.com, firstname.lastname@example.org started to be used as main, and the only contact emails, ransom note unchanged and the file remains _readme.txt.
Kvag ransomware came out after all those changes and become extremely active, based on user reports on our site. However, previous versions .hese, .seto, .peta, .moka, and .meds also encrypted peoples' computer at the same time. Thanks to all those samples and reports, we and other researchers could investigate the newest changes made by Djvu creators.
Yet again, people are not careful with their files and illegal habits, so ransomware quietly spreads via torrent files. Some of you stated that cracks and Russian file-sharing sites led to the ransom note appears on the screen. Since there is a long period of waiting until the proper decryption tool gets developed, you should store all virus-related files on an external device and wait for the possibility to restore your data.
Karl ransomware came with .domn virus version and more options from researchers. The changed method of file-locking left no options but to disable STOP-Decrypter and end service of file recovery. However, other researchers made their analysis and now can offer other services.
In some rare cases when offline keys still get used you can try to use the decryptor, or rely on other services that are offered by researchers:
- For people that have data encrypted using offline keys, there is a decryption option here.
- Dr.Web also offers a tool named Rescue Pack that costs 150 euro per user.
Nesa ransomware is still delivering AZORult malware and making all the changes in the system like dropping modules set to steal stored data and information from web browsers. However, the threat leaves hosts file on the system that keeps you from accessing sites like ours and search other methods to recover from the attack. For that, go to this location and find “hosts” file: C:\Windows\System32\drivers\etc. Delete it completely by using admin permissions.
Upper-mentioned services can work for this variant, and you can additionally search these sites for decryption tool:
Meka ransomware is the 178th version in this ever-changing cryptovirus family that came out in 2019, at the start of November alongside the other three versions that were spotted in the span of one week: .toec, .mosk, .nakw. This is the typical Djvu version that uses a random combination of four letters for the file marker and loads the encryption process at the start of an infection. When data gets locked, _readme.txt appears in various folders and on the desktop, so the victim is informed on further actions.
This text file as typical includes contact emails email@example.com, firstname.lastname@example.org and ransom amount indication, particular ID for the victim, and suggestions where to get Bitcoins that is preferred cryptocurrency for the payment. Djvu can be decrypted if offline IDs get used to generate victims identification numbers.
Lokf ransomware came right after the previous version, in the first week of November 2019, but this version used different emails as contact preferences than other known variants. email@example.com, firstname.lastname@example.org – the preferred method of contacting virus developers. .peet, .grod, .mbed, .kodg and .zomb came out after Lokf with the same reason note as before – _readme.txt and slight alterations in coding.
However, the usage of online IDs stopped way before these variants to released. So people haven't been decrypting their files using any third-party tools. .lokf marked data cannot get covered without proper data backups or programs designed to restore data.
Remk ransomware was one of the first versions that started to use email@example.com, firstname.lastname@example.org email addresses as the main preferred contact methods. These emails are exceptionally used by other later versions too. .remk extension came after a not so active period for Djvu creators. December was not the most active month for the criminals because during the time of Holidays malware actors released only 5 new variants.
January and February together have around ten new extensions in total, including .reha, .topi, .repp, .alka, .bboo, .mmnn, .ooss, and .nppp. Djvu creators became more active in March and April of 2020 releasing new variants every week. However, changes remaining very slight because the same emails, ransom note, and ransom amount go for at least 20 or 30 versions.
Mado ransomware comes right after .npsk and .opqz versions that all came up to the researchers' attention in few days from each other. This is one of the many variants that have all the common and typical features of the Djvu ransomware family:
- email@example.com, firstname.lastname@example.org contact emails;
- _readme.txt – ransom note;
- online keys as the primary method of generating victims' IDs;
- AES and RSA encryption algorithms;
- discount offer int he ransom note;
- distributed via pirated software files mainly;
- $980 final ransom amount.
Jope ransomware is also one of these similar versions that came out in Spring 2020 when email@example.com, firstname.lastname@example.org get used as primary email addresses and _readme.txt still contains the same message:
Don't worry, you can return all your files!
All your files like photos, databases, documents and other important are encrypted with strongest encryption and unique key.
The only method of recovering files is to purchase decrypt tool and unique key for you.
This software will decrypt all your encrypted files.
What guarantees you have?
You can send one of your encrypted file from your PC and we decrypt it for free.
But we can decrypt only 1 file for free. File must not contain valuable information.
You can get and look video overview decrypt tool:
Price of private key and decrypt software is $980.
Discount 50% available if you contact us first 72 hours, that's price for you is $490.
Please note that you'll never restore your data without payment.
Check your e-mail “Spam” or “Junk” folder if you don't get answer more than 6 hours.
To get this software you need write on our e-mail:
Reserve e-mail address to contact us:
Your personal ID:
Unfortunately, malware creators are not planning to change encryption methods or rely on online keys for the ID generation, so decryption options remain limited and only those people who get versions using offline IDs can use the existing decryption tool and restore their data. For others, paying still shouldn't be an option. Anti-malware tools can detect most of these versions, so you have methods for Djvu virus removal at least. Djvu ransomware uses spam emails, among others, to distribute malware's payload
Sqpc ransomware variant has been attributed to the Djvu family in May 2020. Since this meets new family members every few weeks, this variant is not a surprise. People on Reddit started reporting about their personal files being compromised by ransomware that adds .sqpc file extension to the locked files and creates a ransom note _readme.txt.
The _readme.txt note is typical to most of the Djvu ransomware variants. It reports the attack and demands the victim to contact the criminals behind the ransomware within 72 hours if he or she wants to get 50% off the decryption software's price.
The main contact of the criminals was not changed, i.e. email@example.com is still used as the main e-mail contact like in most of the variants of this ransomware family. However, a never-seen-before e-mail firstname.lastname@example.org has been added making a slight, thus making the ransomware slightly deviated from its ancestors.
Unfortunately, the virus cannot be decrypted, at least not yet. Its developers rely on online key leaving a limited room for experts to create a decryption software that worlds for all victims. Nevertheless, we do not recommend paying the ransom. At best, remove sqpc ransomware from the system ASAP and try to recover data with STOPdecryper or alternative software.
Mzlq ransomware is a version of Djvu that showed up in the middle of May 2020. Just as its predecessors, the malware uses the RSA encryption algorithm to encrypt pictures, videos, music, documents, and other files, and then appends a four-letter file extension (in this case, .mzlq). After that, the malware drops a ransom note _readme.txt, which explains to users what happened to their machines.
Unfortunately, they are told that all of their files have been locked, and only Mzlq ransomware authors are capable of restoring data. While this is partially true (files can be restored through backups, if such were prepared), criminals are correct about only them possessing the unique key for the decryption process. Security experts recommend avoiding contacting cybercriminals, as they might not deliver the required Mzlq ransomware decryptor even after the bitcoins are transferred.
Currently, Mzlq file virus installer has a relatively low detection rate – the following names are used for the sample:
- Win/malicious_confidence_100% (W)
- Ransom.STOP!8.10810 (CLOUD), etc.
Koti ransomware emerged on the surface as a 226th family member of the infamous Djvu ransomware. Since this ransomware family is infamous for its regular releases of new variants, Koti has been expected in the Middle of May 2020 and here it is.
.koti file extension virus is one of the latest Djvu ransomware family members detected in spring 2020
In fact, it's similar to its predecessors, except one thing – a new file extension used as a marker of the encrypted files. All photos, documents, archived files, and other system unrelated data get a .koti file extension. Upon encryption, it drops a ransom note named _readme.txt, which contains the following information:
- The fact that the system has been attacked by ransomware due to multiple vulnerabilities;
- Warning about the consequences if the victim attempts to remove the ransomware or uses third-party data recovery programs;
- Email addresses of the ransomware managers, i.e. email@example.com and firstname.lastname@example.org;
- The size of the redemption ($490 if the victim pays within 72 hours or $980 if the payment is delayed);
- Bitcoin wallet number.
At the moment of writing, this ransomware is not the most proliferate. However, it may gather momentum at any time, so be careful with email attachments, make sure to install all available Windows updates, keep anti-virus programs activated all the time, and be very attentive when browsing the Internet. In case of an attack, do not postpone Koti removal since it may not only encrypt files, but also try to download trojan or another malware as a secondary payload.
Zipe ransomware, also known as .zipe file extension virus is a copy-paste version of the earlier Djvu family members, so there's no need to expatriate on its traits. Likewise its predecessor, it renders AES encryption algorithm and protects the password with the RSA encryption algorithm, making itself impossible to crack.
When the cipher does its job, the ransomware marks its territory by adding a .zipe file extension to every locked file. It may skip some of the personal files unlocked; however, it will definitely attack pictures, photos, documents, compressed files, archives, etc.
Aside from altered suffixes of files, people will find the _readme.txt file on the desktop and other random folders. This text file informs about the ransomware attack, explains how to purchase Bitcoins, and asks to pay $480 (or $980 if the time of 72 hours is exceeded) in Bitcoins.
Victims of this virus should not pay redemption. Although the decryption software hasn't yet been developed, it's only a matter of time when Emsisoft's decryptor will be updated. Therefore, it's advisable to remove Zipe ransomware from the machine and make the backups of the locked files. After that, either try alternative decryption methods listed below or wait until cybersecurity experts create a software that can decrypt Djvu versions that have been launched after August 2019.
Questions on how to decrypt files encrypted by .nlah file extension virus have emerged on the 2nd of June, 2020 on Reddit. That was the first signal that Djvu developers are strengthening their forces and rescheduling the weekly releases of the new strains. The previous 228th version dubbed as Zipe has occurred a day before the emergence of Nlah ransomware.
Thus, cybersecurity experts have a presumption that the summer of 2020 may exhibit increased activity of Djvu ransomware variants. The latest Nlah virus seems to be fully functional since it has already started attacking individual PC users via spam emails and unprotected RDPs.
During the phases of the attack, the ransomware enables encryption engine (AES and RSA) and locks files in exchange of almost $1000 ransom in Bitcoins. If you have been attacked by this threat, do not write emails to email@example.com or firstname.lastname@example.org because these emails are managed by criminals. Instead of that, eliminate Nlah ransomware with a proper security tool and try to decrypt files using third-party recovery tools.
Zwer ransomware is another member of an ever-expanding Djvu ransomware family. First picked up by a security researcher Michael Gillespie, this variant does not differ much from previous versions.
The malware typically spreads via infectious pirated program installers or software cracks that can typically be downloaded from third-party websites (mainly torrent sites). The main executable can be named as anything, although one sample of Zwer file virus was found as b71d.tmp.exe and is detected by many anti-malware programs.
The malware uses the RSA encryption algorithm to lock files and then appends .zwer extension to pictures, videos, documents, databases, and other files, preventing user access. To unlock data, victims are asked to email the perpetrators via email@example.com or firstname.lastname@example.org in order to retrieve a decryption tool.
Additionally, the _readme.txt note also informs users that they are eligible for a 50% price discount if they send an email within 72 hours of the infection. As usual, security researchers do not recommend paying for the Zwer ransomware decryptor and rather rely on Emsisoft's decryptor or third-party tools to recover data.
Newest Djvu ransomware versions
Djvu ransomware is the biggest malware family that attacks regular consumers, accounting for approximately 70% cases reported to Ransomware-ID, according to Emsisoft report.
The malware family is constantly growing, and, while there are minimal differences from one variant to the next, there are little chances of victims retrieving their files for free if they were locked using an online key. Here are the most recent Djvu ransomware versions:
Ransomware viruses distribute via spam messages, software cracks, and adware bundles
According to cybersecurity specialists from LosVirus.es, ransomware infections can appear on the computer because of an opened spam letter or its attachment. Some email messages, that are dropped by the crooks, might contain a hazardous link inserted inside the letter itself, or a dubious attachment that comes clipped to the email. Be aware of all questionable emails, do not open, and if they look malicious or suspicious in some certain way.
Furthermore, you can detect that something is wrong if the email message contains various grammar mistakes, and if it comes from an unrecognizable sender. However, not all of them look this way. Some crooks pretend to be from worldwide organizations. So, if you were not expecting to receive anything important recently, you better not access any messages. What you should do is contact the company directly if necessary.
Additionally, in some cases, ransomware viruses can distribute through third-party networks. All pages that come from secondary sources often lack required protection and do not fit the security requirements. This leads to a high risk of getting infected by dangerous malware, e.g. ransomware. We suggest avoiding all non-original pages and suspicious hyperlinks that you might encounter while browsing the web.
With the .tro file extension, ransomware was spotted being distributed with the help of so-called “cracks” and “keygens.” These files are used to crack the original software to make it perform as a licensed version. Such activity is highly illegal, and users could face fines and legal actions if they get caught. Besides, the risk of infecting the PC with ransomware should diminish the urge to crack programs.
Finally, researchers said that the virus is also being spread bundled with adware programs. To stop unwanted apps from entering the machine, never skip the installation steps, and read through the installation instructions. Always pick Advanced/Custom installation mode instead of Recommended/Quick one and remove all the optional components that are offered.
Many users recently reported that the ransom note stating about encryption and ransom demand appeared on their screen after cracked software installation. Such programs like Adobe Photoshop, Illustrator or video games like NBA package, serial numbers or license keys of legitimate applications, security tools contain much more in the installation setup.
Public pirated content pages deliver such ransomware payload as installer file and once the executable gets loaded on the machine malicious script is triggered and encryption starts. The file-locking process happens in a matter of minutes, so you cannot do anything about it, even though you noticed that something is off.
To get rid of Djvu virus, employ recommended AV software
To remove Djvu virus, use only reputable computer software. Furthermore, you can detect all malware-laden content by scanning the computer system with the proper security or anti-malware tool like:
Such software is created to lengthen the removal process for all users. Even though the detection process might take a while, please, be patient as you will find it incredibly useful later on. You should also look for detection rates and sample analysis to see if the threat you encounter can be detected and removed with other tools that worked for previous Djvu versions.
Performing the Djvu ransomware removal requires a lot of attention. This is the main reason why you should leave the process for automatic computer tools. Furthermore, after you proceed with the elimination, make sure that you perform some system backups. All ransomware-related components need to be removed permanently for the computer to work normally again. Also, files that get corrupted during these malicious processes need to get repaired using ReimageIntego or different PC tools.
NOTE! You can find yourself blocked while trying to download anti-virus software or visit a legitimate security site. For that, go to this location and find “hosts” file: C:\Windows\System32\drivers\etc. Delete it completely by using admin permissions.
To remove Djvu virus, follow these steps:
Manual Djvu removal using Safe Mode
Enable Safe Mode with Networking to deactivate the Djvu ransomware virus and its malicious activities on your computer:
Manual removal guide might be too complicated for regular computer users. It requires advanced IT knowledge to be performed correctly (if vital system files are removed or damaged, it might result in full Windows compromise), and it also might take hours to complete. Therefore, we highly advise using the automatic method provided above instead.
Step 1. Access Safe Mode with Networking
Manual malware removal should be best performed in the Safe Mode environment.
Windows 7 / Vista / XP
- Click Start > Shutdown > Restart > OK.
- When your computer becomes active, start pressing F8 button (if that does not work, try F2, F12, Del, etc. – it all depends on your motherboard model) multiple times until you see the Advanced Boot Options window.
- Select Safe Mode with Networking from the list.
Windows 10 / Windows 8
- Right-click on Start button and select Settings.
- Scroll down to pick Update & Security.
- On the left side of the window, pick Recovery.
- Now scroll down to find Advanced Startup section.
- Click Restart now.
- Select Troubleshoot.
- Go to Advanced options.
- Select Startup Settings.
- Press Restart.
- Now press 5 or click 5) Enable Safe Mode with Networking.
Step 2. Shut down suspicious processes
Windows Task Manager is a useful tool that shows all the processes running in the background. If malware is running a process, you need to shut it down:
- Press Ctrl + Shift + Esc on your keyboard to open Windows Task Manager.
- Click on More details.
- Scroll down to Background processes section, and look for anything suspicious.
- Right-click and select Open file location.
- Go back to the process, right-click and pick End Task.
- Delete the contents of the malicious folder.
Step 3. Check program Startup
- Press Ctrl + Shift + Esc on your keyboard to open Windows Task Manager.
- Go to Startup tab.
- Right-click on the suspicious program and pick Disable.
Step 4. Delete virus files
Malware-related files can be found in various places within your computer. Here are instructions that could help you find them:
- Type in Disk Cleanup in Windows search and press Enter.
- Select the drive you want to clean (C: is your main drive by default and is likely to be the one that has malicious files in).
- Scroll through the Files to delete list and select the following:
Temporary Internet Files
- Pick Clean up system files.
- You can also look for other malicious files hidden in the following folders (type these entries in Windows Search and press Enter):
After you are finished, reboot the PC in normal mode.
Remove Djvu using System Restore
Turn on the System Restore feature to disable the virus. Use these instructions if help is needed:
Step 1: Reboot your computer to Safe Mode with Command Prompt
Windows 7 / Vista / XP
- Click Start → Shutdown → Restart → OK.
- When your computer becomes active, start pressing F8 multiple times until you see the Advanced Boot Options window.
- Select Command Prompt from the list
Windows 10 / Windows 8
- Press the Power button at the Windows login screen. Now press and hold Shift, which is on your keyboard, and click Restart..
- Now select Troubleshoot → Advanced options → Startup Settings and finally press Restart.
- Once your computer becomes active, select Enable Safe Mode with Command Prompt in Startup Settings window.
Step 2: Restore your system files and settings
- Once the Command Prompt window shows up, enter cd restore and click Enter.
- Now type rstrui.exe and press Enter again..
- When a new window shows up, click Next and select your restore point that is prior the infiltration of Djvu. After doing that, click Next.
- Now click Yes to start system restore.
Bonus: Recover your dataGuide which is presented above is supposed to help you remove Djvu from your computer. To recover your encrypted files, we recommend using a detailed guide prepared by 2-spyware.com security experts.
If files got locked with the .djvu appendix, and you are wondering how to bring them back to their starter positions, we recommend taking a look at the below-given data recovery methods, some of which you might find helpful.
If your files are encrypted by Djvu, you can use several methods to restore them:
Use the Data Recovery Pro tool to bring important data back:
Try this third-party program if you are keen on restoring files that were encrypted by Djvu ransomware virus:
- Download Data Recovery Pro;
- Follow the steps of Data Recovery Setup and install the program on your computer;
- Launch it and scan your computer for files encrypted by Djvu ransomware;
- Restore them.
Windows Previous Versions feature might also help you restore some files:
Try this method out, however, note that it might not be successful if you did not activate the System Restore function.
- Find an encrypted file you need to restore and right-click on it;
- Select “Properties” and go to “Previous versions” tab;
- Here, check each of available copies of the file in “Folder versions”. You should select the version you want to recover and click “Restore”.
The Shadow Explorer tool might recover data:
Use this tool if the virus did not eliminate Shadow Volume Copies of locked data. However, if it did, try the other above-given methods.
- Download Shadow Explorer (http://shadowexplorer.com/);
- Follow a Shadow Explorer Setup Wizard and install this application on your computer;
- Launch the program and go through the drop down menu on the top left corner to select the disk of your encrypted data. Check what folders are there;
- Right-click on the folder you want to restore and select “Export”. You can also select where you want it to be stored.
To recover files encrypted by Djvu ransomware, use STOPdecryptor.
Virus researcher called DemonSlay355 presented an updated version of STOPdecryptor which can be used to recover files encrypted by Djvu. However, it no longer works for newer versions.
For some of the recent versions, there is no official decryptor. We recommend following this forum topic to know all the updates
Finally, you should always think about the protection of crypto-ransomwares. In order to protect your computer from Djvu and other ransomwares, use a reputable anti-spyware, such as ReimageIntego, SpyHunter 5Combo Cleaner or Malwarebytes
Do not let government spy on you
The government has many issues in regards to tracking users' data and spying on citizens, so you should take this into consideration and learn more about shady information gathering practices. Avoid any unwanted government tracking or spying by going totally anonymous on the internet.
You can choose a different location when you go online and access any material you want without particular content restrictions. You can easily enjoy internet connection without any risks of being hacked by using Private Internet Access VPN.
Control the information that can be accessed by government any other unwanted party and surf online without being spied on. Even if you are not involved in illegal activities or trust your selection of services, platforms, be suspicious for your own security and take precautionary measures by using the VPN service.
Backup files for the later use, in case of the malware attack
Computer users can suffer from data losses due to cyber infections or their own faulty doings. Ransomware can encrypt and hold files hostage, while unforeseen power cuts might cause a loss of important documents. If you have proper up-to-date backups, you can easily recover after such an incident and get back to work. It is also equally important to update backups on a regular basis so that the newest information remains intact – you can set this process to be performed automatically.
When you have the previous version of every important document or project you can avoid frustration and breakdowns. It comes in handy when malware strikes out of nowhere. Use Data Recovery Pro for the data restoration process.