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Crypren ransomware virus. How to remove? (Uninstall guide)

removal by Jake Doevan - - | Type: Ransomware

Crypren is a highly dangerous cyber infection listed as ransomware

Crypren virus illustration

Questions about Crypren ransomware virus

Crypren is a ransomware virus[1] that attacks random system's via infected email attachments and locks personal files with .encrypted file extension. An example of a file encrypted by Crypren ransomware would be: photo199.jpg.encrypted. The ransomware payload spreads in a form of Crypren.exe. It uses RSA-2048 algorithm[2] to lock personal files out and runs multiple scripts to root deeply into OS. Upon successful installation and file encryption, the virus leaves a READ_THIS_TO_DECRYPT.txt file on the desktop and drops a HTML file with payment instructions. 

Name Crypren
Type Ransomware
Danger level High. Can cause permanent data loss
Related files Crypren.exe
File extension .encrypted
Ransom note READ_THIS_TO_DECRYPT.txt
Currency accepted Bitcoin only
Decryptable No
A scan with Reimage will eliminate Crypren ransoware permanently

Crypren virus has been first spotted in 2016 by a group of ransomware researchers. It does not differ from the rest of ransomware family members. Its payload (Crypren.exe) is being distributed via malspam, rogue software updates, drive-by-download, and other social engineering strategies. 

As soon as it is downloaded, it launches a scanner, enables RSA cipher, and appends .encrypted file extension to the following file formats: 

sql, .mp4, .7z, .rar, .m4a, .wma, .avi, .wmv, .csv, .d3dbsp, .zip, .sie, .sum, .ibank, .t13, .t12, .qdf, .gdb, .tax, .pkpass, .bc6, .bc7, .bkp, .qic, .bkf, .sidn, .sidd, .mddata, .itl, .itdb, .icxs, .hvpl, .hplg, .hkdb, .mdbackup, .syncdb, .gho, .cas, .svg, .map, .wmo, .itm, .sb, .fos, .mov, .vdf, .ztmp, .sis, .sid, .ncf, .menu, .layout, .dmp, .blob, .esm, .vcf, .vtf, .dazip, .fpk, .mlx, .kf, .iwd, .vpk, .tor, .psk, .rim, .w3x, .fsh, .ntl, .arch00, .lvl, .snx, .cfr, .ff, .vpp_pc, .lrf, .m2, .mcmeta, .vfs0, .mpqge, .kdb, .db0, .dba, .rofl, .hkx, .bar, .upk, .das, .iwi, .litemod, .asset, .forge, .ltx, .bsa, .apk, .re4, .sav, .lbf, .slm, .bik, .epk, .rgss3a, .pak, .big, wallet, .wotreplay, .xxx, .desc, .py, .m3u, .flv, .js, .css, .rb, .png, .jpeg, .txt, .p7c, .p7b, .p12, .pfx, .pem, .crt, .cer, .der, .x3f, .srw, .pef, .ptx, .r3d, .rw2, .rwl, .raw, .raf, .orf, .nrw, .mrwref, .mef, .erf, .kdc, .dcr, .cr2, .crw, .bay, .sr2, .srf, .arw, .3fr, .dng, .jpe, .jpg, .cdr, .indd, .ai, .eps, .pdf, .pdd, .psd, .dbf, .mdf, .wb2, .rtf, .wpd, .dxg, .xf, .dwg, .pst, .accdb, .mdb, .pptm, .pptx, .ppt, .xlk, .xlsb, .xlsm, .xlsx, .xls, .wps, .docm, .docx, .doc, .odb, .odc, .odm, .odp, .ods, .odt.

Then the victim is presented with the payment instructions – a text file READ_THIS_TO_DECRYPT.txt on the desktop and READ_THIS_TO_DECRYPT HTML. Earlier Crypren ransom was considered to be relatively small – 0.1 BTC. However, while in 2016 0.1 BTC was approximately 37 USD, currently the ransom reaches approximately 700 USD.

Virukset.fi[3] cyber security experts warn that this ransomware did not discontinue. Although it hasn't been active in 2017, researchers found it revived in the beginning of April 2018. Although 45 out 65 AV engines are capable of detecting (Trojan.Ransom.CryprenTrojan-Ransom.Win32.Crypren.acmd,Ransom.Win32.Crypren.aRansom_Crypren.R002C0DD318, etc.), ransomware viruses keep mutating and find out how to evade detection. 

Crypren malware detection by AV engines

If this ransomware has already attacked your PC, we would strongly recommend you to perform a full Crypren removal using Reimage, Plumbytes Anti-MalwareWebroot SecureAnywhere AntiVirus, Malwarebytes Anti Malware, or another reputable anti-virus. Manual ransomware elimination is not recommended and is hardly possible. That's because it corrupts Windows Registry entries, compromises boot order, injects related components into core system's folders, and initiates other complex modifications that can be reverted with a professional utility only. 

You'll be able to recover encrypted data after a complete Crypren removal. Please do not trust criminals and rėestrain from paying the ransom despite the fact how small it might seem to you. Instead of a paid Crypren decryptor, crooks can foist spyware or worm. 

You can find a list of alternative ways on how to decrypt files encrypted by Crypren ransomware at the end of this article. 

The transmission of crypto malware

This threat is seen traveling along with spam. In other words, cyber criminals have created persuasive spam emails which contain infected attachments. As a result of users’ curiosity, a relatively high number of users worldwide reported their computers to be infected with crypto-malware. Thus, when the attachment is open, the virus gets activated, and it takes off to encrypt the files.

Crypren ransomware left note

Additionally, the virus may infiltrate your computer via exploit kits or so-called trojans. They are regarded as especially dangerous for their ability to pass themselves as legitimate files. Thus, at this point, it is of vital importance to have an anti-spyware program, for example, Reimage, on your system for it detect such threats as exploit kits.

In addition, the virus may also disperse via peer-to-peer sharing and gaming websites. These websites are often filled with various hyperlinks and distracting advertisements offering to visit certain websites or purchase specific applications. All in all, you should not get carried away and avoid click on suspicious links and images. Finally, let us proceed to the section where will tell you how to remove ransomware effectively.

Crypren removal steps

The only effective way to remove Crypren virus and root out its helper objects, files, and processes is to install a powerful security tool and run a full system scan with it. Indeed, you can use a program that is currently running on your PC, but don't forget to update its definitions before a scan. 

As we have already pointed out, manual Crypren removal is not possible. By deleting random files you can damage the system and cause fatal crash. Therefore, we would recommend choosing a risk-free removal option. 

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Manual Crypren virus Removal Guide:

Remove Crypren using Safe Mode with Networking

Do not fall for panic if Crypren malware blocks your antivirus and does not let to download another one. Ransomware wall is a common practice, which can be bypassed by booting the system into Safe Mode with Networking.

  • Step 1: Reboot your computer to Safe Mode with Networking

    Windows 7 / Vista / XP
    1. Click Start Shutdown Restart OK.
    2. When your computer becomes active, start pressing F8 multiple times until you see the Advanced Boot Options window.
    3. Select Safe Mode with Networking from the list Select 'Safe Mode with Networking'

    Windows 10 / Windows 8
    1. Press the Power button at the Windows login screen. Now press and hold Shift, which is on your keyboard, and click Restart..
    2. Now select Troubleshoot Advanced options Startup Settings and finally press Restart.
    3. Once your computer becomes active, select Enable Safe Mode with Networking in Startup Settings window. Select 'Enable Safe Mode with Networking'
  • Step 2: Remove Crypren

    Log in to your infected account and start the browser. Download Reimage or other legitimate anti-spyware program. Update it before a full system scan and remove malicious files that belong to your ransomware and complete Crypren removal.

If your ransomware is blocking Safe Mode with Networking, try further method.

Remove Crypren using System Restore

  • Step 1: Reboot your computer to Safe Mode with Command Prompt

    Windows 7 / Vista / XP
    1. Click Start Shutdown Restart OK.
    2. When your computer becomes active, start pressing F8 multiple times until you see the Advanced Boot Options window.
    3. Select Command Prompt from the list Select 'Safe Mode with Command Prompt'

    Windows 10 / Windows 8
    1. Press the Power button at the Windows login screen. Now press and hold Shift, which is on your keyboard, and click Restart..
    2. Now select Troubleshoot Advanced options Startup Settings and finally press Restart.
    3. Once your computer becomes active, select Enable Safe Mode with Command Prompt in Startup Settings window. Select 'Enable Safe Mode with Command Prompt'
  • Step 2: Restore your system files and settings
    1. Once the Command Prompt window shows up, enter cd restore and click Enter. Enter 'cd restore' without quotes and press 'Enter'
    2. Now type rstrui.exe and press Enter again.. Enter 'rstrui.exe' without quotes and press 'Enter'
    3. When a new window shows up, click Next and select your restore point that is prior the infiltration of Crypren. After doing that, click Next. When 'System Restore' window shows up, select 'Next' Select your restore point and click 'Next'
    4. Now click Yes to start system restore. Click 'Yes' and start system restore
    Once you restore your system to a previous date, download and scan your computer with Reimage and make sure that Crypren removal is performed successfully.

Bonus: Recover your data

Guide which is presented above is supposed to help you remove Crypren from your computer. To recover your encrypted files, we recommend using a detailed guide prepared by 2-spyware.com security experts.

If your files are encrypted by Crypren, you can use several methods to restore them:

Rely on Data Recovery Pro

Data Recovery Pro is not a decryptor. Nevertheless, it's a powerful software recovery solution, which is capable of restoring accidentally deleted or damaged files. Based on people's reports, it helped millions of ransomware victims to escape paying the ransom. 

Previous Windows Versions can help to retrieve separate files

Previous Windows Versions or System Restore Point can hardly help to recover files massively. However, this method is useful for those who seek to recover separate files. 

  • 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”.

Exploit Volume Shadow Copies

Download ShadowExplorer and check whether Crypren virus managed to delete Volume Shadow Copies or not. In case these copies are safely stored, ShadowExplorer should successfully export them. 

  • 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.

No decryptor available.

Finally, you should always think about the protection of crypto-ransomwares. In order to protect your computer from Crypren and other ransomwares, use a reputable anti-spyware, such as Reimage, Plumbytes Anti-MalwareWebroot SecureAnywhere AntiVirus or Malwarebytes Anti Malware

About the author

Jake Doevan
Jake Doevan - Computer technology expert

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