.block ransomware (virus) - Free Guide
.block virus Removal Guide
What is .block ransomware?
.block ransomware creators perform many malicious tasks in order to get paid
Block ransomware appends victims' files with the .block extension
Ransomware attacks have increased by 150% since 2020, and threat actors do not seem to be stopping any time soon. The virus' destructive nature makes it very worthwhile for cybercriminals to keep creating new malicious programs that lock peoples' personal files. The potential reward for ransomware developers can vary from as little as $50 to as big as $10 million (if the target is a big company) from a single PC.
There is almost nothing else that compares to the danger ransomware currently poses. If big corporations do not have good security systems in place they can become susceptible to these kinds of attacks and even get sensitive data leaked online if they do not pay huge sums of money in cryptocurrency.
Block ransomware is one of the most recent strains detected by 36 security vendors that seem to be developed by Russian hackers because the ransom note is written in Russian or maybe that is done in order to throw off the authorities. This particular malicious program encrypts files and appends them with the .block extension. So, if the file was previously names picture.jpg, now it would be named picture.jpg.block, and the icons get changed to white pages. Because of that, users quickly notice that something is very wrong.
Shortly after the encryption process is done, a ransom note by the name readMe!.txt is generated on the victims' computer to inform them about what steps they should take. Although it might be tempting, we strongly advise against contacting the cybercriminals responsible for the attack, as many previous ransomware victims report that they have never received a response after paying the asked amount, so they not only lost their data but their files too.
|TYPE||Ransomware, cryptovirus, data-locking malware|
|DISTRIBUTION||Email attachments, peer-to-peer file sharing platforms, malicious ads|
|FILE RECOVERY||If no backups are available, recovering data is almost impossible. We list alternative methods that could help you in some cases below|
|MALWARE REMOVAL||Scan your machine with anti-malware software like SpyHunter 5Combo Cleaner or Malwarebytes to eliminate the malicious files. This will not recover your data.|
|SYSTEM FIX||Malware can seriously tamper with Windows systems, causing errors, crashes, lag, and other stability issues. To remediate the OS and avoid its reinstallation, we recommend scanning it with the RestoroIntego repair tool|
Block virus in detail
Malware researchers from JoeSandbox have done a complete analysis on this malicious program – how it works, what tasks it performs in the background, and other properties it has. One of the things they found is that the malicious file includes an icon from a different legit application in order to fool users or make it harder to notice the virus. Another thing is that this malware has machine learning coded into it, which means it can avoid detection. One of the ways it does that is by creating files in the recycle bin. Thanks to machine learning, malware can also avoid removal – disable antivirus protection.
One of the most worrying things Block ransomware does is delete the shadow drive data, which makes it very difficult or even impossible to restore the data after the infection as that deletes all backups from the system itself. Besides locking files on a target computer, we can also suspect according to abnormal high CPU usage (in some cases over 98%) that the malicious program does something called cryptojacking. This is another way threat actors could be generating revenue with ransomware. It uses the victim's electricity and computing power to mine cryptocurrencies.
The most important thing you should be asking yourself is – how did it end up on my computer? And there are multiple possible answers to that question. One of the most common ways home users infect themselves with ransomware is by installing “cracked” software. We know that paying for software licenses can add up quickly, but it can pay off in the long run if you keep your system safe and not damaged to a point where various malicious programs have messed it up to the point of making it unusable.
Another way cybercriminals prefer to deliver malware is by email. This method is more used for corporate targets. Hackers attach a malicious file or insert a malicious link in the email in the hopes that at least one employee will open it. If that happens, from then on, they can infect all the computers that are connected to the same network, potentially making a business lose all data, which could destroy it. That is why it is important to be cautious in your workplace and open attachments only if you were expecting them. Even if you received an email from someone you know, it is better to double-check if it was them through another platform, as threat actors can infiltrate your email friend list.
The ransom note
The Block virus is spread using social engineering techniques
English translation of readMe!.txt:
Attention! Your files are encrypted. Be sure to email one of the files to firstname.lastname@example.org for instructions. Attempts to decrypt files on your own will lead to their irrecoverable damage. ALWAYS provide your ID –
Unlike many other ransom notes, like from Payransom500, Doydo, and Marlock, this one keeps it short and simple. All the victims learn is that their files are encrypted and that apparently, alternative attempts to recover files can result in permanent damage. Almost all ransomware developers include this or a similar sentence in their note to discourage people from searching for other ways to get their files back. It is a scare tactic used in the hopes that you will act immediately without thinking and will just send them the asked amount in cryptocurrencies.
Threat actors choose crypto as a form of payment because it is harder to track than regular currency, and it is anonymous – as long as you do not deposit it into a bank account because that requires an identity to be provided. Keep in mind that there are no refunds in the cryptocurrency world – once you complete a transaction there is no going back.
Start the removal process
The important thing to do is disconnect the affected machine from the local network as we talked about the dangers of that previously. For home users, disconnecting the ethernet cable should do the job. If this happened at your workplace, doing that might be complicated, so we have instructions for corporate environments at the bottom of this post.
If you try to recover your data first, it can result in permanent loss. It can also encrypt your files the second time. It will not stop until you remove the malicious files causing it first. You should not attempt removing the malicious program yourself unless you have experience. Manual removal of ransomware is extremely complicated and is suitable for people with advanced IT skills.
Use anti-malware tools like SpyHunter 5Combo Cleaner or Malwarebytes to scan your system. This security software should find all the related files and entries and remove them automatically for you. In some cases, malware does not let you use antivirus in normal mode, so you need to access Safe Mode and perform a full system scan from there:
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.
- Click Restart.
- Press 5 or click 5) Enable Safe Mode with Networking.
Repair corrupted system files
Performance, stability, and usability issues, to the point where a full Windows reinstall is required, are nothing unusual after malware infection. These types of viruses can alter the Windows registry database, damage vital bootup, and other sections, delete or corrupt DLL files, etc. Once a system file is damaged by malware, antivirus software cannot fix it.
Manual troubleshooting of such damage is also very complicated and can take a long time. This is why RestoroIntego was developed. It can fix a lot of the damage caused by an infection like this. Blue Screen errors, freezes, registry errors, damaged DLLs, etc., can make your computer completely unusable. By using this maintenance tool, you could prevent yourself from having to reinstall WIndows completely.
- Download the application by clicking on the link above
- Click on the ReimageRepair.exe
- If User Account Control (UAC) shows up, select Yes
- Press Install and wait till the program finishes the installation process
- The analysis of your machine will begin immediately
- Once complete, check the results – they will be listed in the Summary
- You can now click on each of the issues and fix them manually
- If you see many problems that you find difficult to fix, we recommend you purchase the license and fix them automatically.
Try recovering data with third-party software
Only hackers hold the decryption key, which can unlock your files, so if you did not back them up previously, there is a good chance that you will never get them back. You can try using data recovery software, but keep in mind that third-party programs cannot always decrypt the files. Whatever the situation may be, we suggest at least trying this method. Before you proceed, copy the corrupted files and place them in a USB flash drive or another external storage device. And remember – only do this if you have already removed the .block ransomware.
Before you begin, several pointers are important while dealing with this situation:
- Since the encrypted data on your computer might permanently be damaged by security or data recovery software, you should first make backups of it – use a USB flash drive or another storage.
- Only attempt to recover your files using this method after you perform a scan with anti-malware software.
Install data recovery software
- Download Data Recovery Pro.
- Double-click the installer to launch it.
- Follow on-screen instructions to install the software.
- As soon as you press Finish, you can use the app.
- Select Everything or pick individual folders where you want the files to be recovered from.
- Press Next.
- At the bottom, enable Deep scan and pick which Disks you want to be scanned.
- Press Scan and wait till it is complete.
- You can now pick which folders/files to recover – don't forget you also have the option to search by the file name!
- Press Recover to retrieve your files.
Keep your data safe by doing this:
- Keep backups of your data on multiple storage devices
- Do not click on unsafe links
- Do not disclose your personal information to strangers or post it on the Internet
- Do not open suspicious email attachments
- Update your operating system and software as frequently as possible
- Have trusted professional security tools in your system to add an additional layer of safety
Getting rid of .block virus. Follow these steps
Isolate the infected computer
Some ransomware strains aim to infect not only one computer but hijack the entire network. As soon as one of the machines is infected, malware can spread via network and encrypt files everywhere else, including Network Attached Storage (NAS) devices. If your computer is connected to a network, it is important to isolate it to prevent re-infection after ransomware removal is complete.
The easiest way to disconnect a PC from everything is simply to plug out the ethernet cable. However, in the corporate environment, this might be extremely difficult to do (also would take a long time). The method below will disconnect from all the networks, including local and the internet, isolating each of the machines involved.
- Type in Control Panel in Windows search and press Enter
- Go to Network and Internet
- Click Network and Sharing Center
- On the left, pick Change adapter settings
- Right-click on your connection (for example, Ethernet), and select Disable
- Confirm with Yes.
If you are using some type of cloud storage you are connected to, you should disconnect from it immediately. It is also advisable to disconnect all the external devices, such as USB flash sticks, external HDDs, etc. Once the malware elimination process is finished, you can connect your computers to the network and internet, as explained above, but by pressing Enable instead.
Find a working decryptor for your files
File encryption is a process that is similar to applying a password to a particular file or folder. However, from a technical point of view, encryption is fundamentally different due to its complexity. By using encryption, threat actors use a unique set of alphanumeric characters as a password that can not easily be deciphered if the process is performed correctly.
There are several algorithms that can be used to lock data (whether for good or bad reasons); for example, AES uses the symmetric method of encryption, meaning that the key used to lock and unlock files is the same. Unfortunately, it is only accessible to the attackers who hold it on a remote server – they ask for a payment in exchange for it. This simple principle is what allows ransomware authors to prosper in this illegal business.
While many high-profile ransomware strains such as Djvu or Dharma use immaculate encryption methods, there are plenty of failures that can be observed within the code of some novice malware developers. For example, the keys could be stored locally, which would allow users to regain access to their files without paying. In some cases, ransomware does not even encrypt files due to bugs, although victims might believe the opposite due to the ransom note that shows up right after the infection and data encryption is completed.
Therefore, regardless of which crypto-malware affects your files, you should try to find the relevant decryptor if such exists. Security researchers are in a constant battle against cybercriminals. In some cases, they manage to create a working decryption tool that would allow victims to recover files for free.
Once you have identified which ransomware you are affected by, you should check the following links for a decryptor:
- No More Ransom Project
- Free Ransomware Decryptors by Kaspersky
- Free Ransomware Decryption Tools from Emsisoft
- Avast decryptors
If you can't find a decryptor that works for you, you should try the alternative methods we list below. Additionally, it is worth mentioning that it sometimes takes years for a working decryption tool to be developed, so there are always hopes for the future.
Create data backups to avoid file loss in the future
One of the many countermeasures for home users against ransomware is data backups. Even if your Windows get corrupted, you can reinstall everything from scratch and retrieve files from backups with minimal losses overall. Most importantly, you would not have to pay cybercriminals and risk your money as well.
Therefore, if you have already dealt with a ransomware attack, we strongly advise you to prepare backups for future use. There are two options available to you:
- Backup on a physical external drive, such as a USB flash drive or external HDD.
- Use cloud storage services.
The first method is not that convenient, however, as backups need to constantly be updated manually – although it is very reliable. Therefore, we highly advise choosing cloud storage instead – it is easy to set up and efficient to sustain. The problem with it is that storage space is limited unless you want to pay for the subscription.
Using Microsoft OneDrive
OneDrive is a built-in tool that comes with every modern Windows version. By default, you get 5 GB of storage that you can use for free. You can increase that storage space, but for a price. Here's how to setup backups for OneDrive:
- Click on the OneDrive icon within your system tray.
- Select Help & Settings > Settings.
- If you don't see your email under the Account tab, you should click Add an account and proceed with the on-screen instructions to set yourself up.
- Once done, move to the Backup tab and click Manage backup.
- Select Desktop, Documents, and Pictures, or a combination of whichever folders you want to backup.
- Press Start backup.
After this, all the files that are imported into the above-mentioned folders will be automatically backed for you. If you want to add other folders or files, you have to do that manually. For that, open File Explorer by pressing Win + E on your keyboard, and then click on the OneDrive icon. You should drag and drop folders you want to backup (or you can use Copy/Paste as well).
Using Google Drive
Google Drive is another great solution for free backups. The good news is that you get as much as 15GB for free by choosing this storage. There are also paid versions available, with significantly more storage to choose from.
You can access Google Drive via the web browser or use a desktop app you can download on the official website. If you want your files to be synced automatically, you will have to download the app, however.
- Download the Google Drive app installer and click on it.
- Wait a few seconds for it to be installed.
- Now click the arrow within your system tray – you should see Google Drive icon there, click it once.
- Click Get Started.
- Enter all the required information – your email/phone, and password.
- Now pick what you want to sync and backup. You can click on Choose Folder to add additional folders to the list.
- Once done, pick Next.
- Now you can select to sync items to be visible on your computer.
- Finally, press Start and wait till the sync is complete. Your files are now being backed up.
Report the incident to your local authorities
Ransomware is a huge business that is highly illegal, and authorities are very involved in catching malware operators. To have increased chances of identifying the culprits, the agencies need information. Therefore, by reporting the crime, you could help with stopping the cybercriminal activities and catching the threat actors. Make sure you include all the possible details, including how did you notice the attack, when it happened, etc. Additionally, providing documents such as ransom notes, examples of encrypted files, or malware executables would also be beneficial.
Law enforcement agencies typically deal with online fraud and cybercrime, although it depends on where you live. Here is the list of local authority groups that handle incidents like ransomware attacks, sorted by country:
- USA – Internet Crime Complaint Center IC3
- United Kingdom – ActionFraud
- Canada – Canadian Anti-Fraud Centre
- Australia – ScamWatch
- New Zealand – ConsumerProtection
- Germany – Polizei
- France – Ministère de l'Intérieur
If your country is not listed above, you should contact the local police department or communications center.
How to prevent from getting ransomware
Stream videos without limitations, no matter where you are
There are multiple parties that could find out almost anything about you by checking your online activity. While this is highly unlikely, advertisers and tech companies are constantly tracking you online. The first step to privacy should be a secure browser that focuses on tracker reduction to a minimum.
Even if you employ a secure browser, you will not be able to access websites that are restricted due to local government laws or other reasons. In other words, you may not be able to stream Disney+ or US-based Netflix in some countries. To bypass these restrictions, you can employ a powerful Private Internet Access VPN, which provides dedicated servers for torrenting and streaming, not slowing you down in the process.
Data backups are important – recover your lost files
Ransomware is one of the biggest threats to personal data. Once it is executed on a machine, it launches a sophisticated encryption algorithm that locks all your files, although it does not destroy them. The most common misconception is that anti-malware software can return files to their previous states. This is not true, however, and data remains locked after the malicious payload is deleted.
While regular data backups are the only secure method to recover your files after a ransomware attack, tools such as Data Recovery Pro can also be effective and restore at least some of your lost data.
- ^ Tara Seals. Encrypted & Fileless Malware Sees Big Growth. ThreatPost. Cybersecurity News.
- ^ Detection. VirusTotal. Cyber Threat Research Website.
- ^ Windows Analysis Report cA3HKPci26. JoeSandbox. Malware Overview.
- ^ Cryptojacking – What is it?. Malwarebytes. Cybersecurity Basics.
- ^ What is a malicious URL?. Gatefy. Cybersecurity Education.
- ^ Blue screen of death. Wikipedia. The Free Encyclopedia.
- ^ Dominic Fraser. What are encryption keys and how do they work?. Medium. Blogging Website.