Nemesis Ransomware

Also Known As: Nemesis virus
Distribution: Low
Damage level: Severe

Nemesis ransomware removal instructions

What is Nemesis?

Nemesis is a ransomware-type virus discovered by Michael Gillespie. Once infiltrated, Nemesis encrypts files and appends filenames with the ".id-victim’s ID_[TOR website URL].63vc4" extension (for example, "sample.jpg" might be renamed to "sample.jpgid-3057868259_[qg6m5wo7h3id55ym.onion.to].63vc4"). Newer variants of this ransomware use _.WECANHELP, .aax55, .l454t, .id_[victim’s ID]_[webmafia@asia.com].t5019, .id_[victim’s ID]_[pizdoglaz@asia.com].t5019 or .id_[victim’s ID]_[Blacklagoon@aolonline.top].nemesis extensions for encrypted files. Following successful encryption, Nemesis creates an HTML file ("### DECRYPT MY FILES ###.html"), placing it in each existing folder, and then changes the desktop wallpaper.

The HTML file contains a message informing victims of the encryption and encouraging them to purchase a decryption tool (by visiting a Tor website and paying a ransom). The cost is currently unconfirmed, however, ransomware developers usually demand the equivalent of between $500 and 1500 in Bitcoins. It is currently unknown whether Nemesis uses symmetric or asymmetric cryptography, however, in any case, decryption without a unique key is impossible. This key is stored on a remote server controlled by cyber criminals and victims are encouraged to pay a ransom to receive it. These criminals should never be trusted. Research shows that they often ignore victims, once payments are submitted. There is a high probability that paying will not deliver any positive result and you will be scammed. You are strongly advised to ignore all requests to contact these people or pay any ransom. In doing so, you will simply support their malicious businesses. Unfortunately, there are no tools capable of restoring files encrypted by Nemesis. Therefore, the only solution is to restore files/system from a backup.

Screenshot of a message encouraging users to pay a ransom to decrypt their compromised data:

Nemesis decrypt instructions

There are hundreds of ransomware-type viruses similar to Nemesis. The list of examples includes (but is not limited to) MSIL, Salsa, and PadCrypt. As with Nemesis, these malware infections also encrypt files and makes ransom demands. The only noticeable differences are size of ransom and type of encryption algorithm (symmetric/asymmetric) used. Ransomware-type viruses are often distributed via fake software update tools, trojans, peer-to-peer (P2P) networks (torrents, eMule, etc.), third party software download sources (freeware download websites, free file hosting websites, etc.), and spam emails (malicious attachments). Therefore, use a legitimate anti-virus/anti-spyware suite and keep your installed applications up-to-date. Note, however, that using third party update tools can lead to various computer infections. In addition, be cautious when downloading software from unofficial sources, and when opening files received from suspicious emails. The key to computer safety is caution.

Threat Summary:
Name Nemesis virus
Threat Type Ransomware, Crypto Virus, Files locker
Symptoms Can't open files stored on your computer, previously functional files now have a different extension, for example my.docx.locked. A ransom demanding message is displayed on your desktop. Cyber criminals are asking to pay a ransom (usually in bitcoins) to unlock your files.
Distribution methods Infected email attachments (macros), torrent websites, malicious ads.
Damage All files are encrypted and cannot be opened without paying a ransom. Additional password stealing trojans and malware infections can be installed together with a ransomware infection.
Removal

To eliminate Nemesis virus our malware researchers recommend scanning your computer with Spyhunter.
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Free scanner checks if your computer is infected. To remove malware, you have to purchase the full version of Spyhunter.

Text presented within Nemesis ransomware HTML file ("### DECRYPT MY FILES ###.html"):

ALL YOUR WORK AND PERSONAL FILES HAVE BEEN ENCRYPTED
Nemesis Ransomware
To decrypt your files you need to buy the special software – «Nemesis decryptor»
To recover data, follow the instructions!
You can find out the details/ask questions in the chat:
hxxps://qg6m5wo7h3id55ym.onion.to (not need Tor)
If the resource is not available for a long time, install and use the Tor-browser:
1. Run your Internet-browser
2. Enter or copy the address hxxps://www.torproject.org/download/download-easy.html in the address bar of your browser and press key ENTER
3. On the site will be offered to download the Tor-browser, download and install it. Run.
4. Connect with the button "Connect" (if you use the English version)
5. After connection, the usual Tor-browser window will open
6. Enter or copy the address hxxp://qg6m5wo7h3id55ym.onion in the address bar of Tor-browser and press key ENTER
7. Wait for the site to load
// If you have any problems installing or using, please visit the video tutorial hxxps://www.youtube.com/watch?v=gOgh3ABju6Q

Screenshot of Nemesis ransomware Tor website (Live Support page):

Nemesis website

Screenshot of Nemesis ransomware desktop wallpaper:

Nemesis wallpaper

Screenshot of files encrypted by Nemesis (".id-victim’s ID_[TOR website URL].63vc4" extension):

Files encrypted by Nemesis

Update 3 May, 2017 - Security researcher Fabian Wosar has released a free decrypter for this ransomware. You can download it HERE.

cry128 ransomware decrypter

Nemesis ransomware removal:

Instant automatic removal of Nemesis virus: Manual threat removal might be a lengthy and complicated process that requires advanced computer skills. Spyhunter is a professional automatic malware removal tool that is recommended to get rid of Nemesis virus. Download it by clicking the button below:
▼ DOWNLOAD Spyhunter By downloading any software listed on this website you agree to our Privacy Policy and Terms of Use. Free scanner checks if your computer is infected. To remove malware, you have to purchase the full version of Spyhunter.

Quick menu:

Step 1

Windows XP and Windows 7 users: Start your computer in Safe Mode. Click Start, click Shut Down, click Restart, click OK. During your computer start process, press the F8 key on your keyboard multiple times until you see the Windows Advanced Option menu, and then select Safe Mode with Networking from the list.

Safe Mode with Networking

Video showing how to start Windows 7 in "Safe Mode with Networking":

Windows 8 users: Start Windows 8 is Safe Mode with Networking - Go to Windows 8 Start Screen, type Advanced, in the search results select Settings. Click Advanced startup options, in the opened "General PC Settings" window, select Advanced startup. Click the "Restart now" button. Your computer will now restart into the "Advanced Startup options menu". Click the "Troubleshoot" button, and then click the "Advanced options" button. In the advanced option screen, click "Startup settings". Click the "Restart" button. Your PC will restart into the Startup Settings screen. Press F5 to boot in Safe Mode with Networking.

Windows 8 Safe Mode with networking

Video showing how to start Windows 8 in "Safe Mode with Networking":

Windows 10 users: Click the Windows logo and select the Power icon. In the opened menu click "Restart" while holding "Shift" button on your keyboard. In the "choose an option" window click on the "Troubleshoot", next select "Advanced options". In the advanced options menu select "Startup Settings" and click on the "Restart" button. In the following window you should click the "F5" button on your keyboard. This will restart your operating system in safe mode with networking.

windows 10 safe mode with networking

Video showing how to start Windows 10 in "Safe Mode with Networking":

Step 2

Log in to the account infected with the Nemesis virus. Start your Internet browser and download a legitimate anti-spyware program. Update the anti-spyware software and start a full system scan. Remove all entries detected.

If you cannot start your computer in Safe Mode with Networking, try performing a System Restore.

Video showing how to remove ransomware virus using "Safe Mode with Command Prompt" and "System Restore":

1. During your computer start process, press the F8 key on your keyboard multiple times until the Windows Advanced Options menu appears, and then select Safe Mode with Command Prompt from the list and press ENTER.

Boot your computer in Safe Mode with Command Prompt

2. When Command Prompt mode loads, enter the following line: cd restore and press ENTER.

system restore using command prompt type cd restore

3. Next, type this line: rstrui.exe and press ENTER.

system restore using command prompt rstrui.exe

4. In the opened window, click "Next".

restore system files and settings

5. Select one of the available Restore Points and click "Next" (this will restore your computer system to an earlier time and date, prior to the Nemesis ransomware virus infiltrating your PC).

select a restore point

6. In the opened window, click "Yes".

run system restore

7. After restoring your computer to a previous date, download and scan your PC with recommended malware removal software to eliminate any remaining Nemesis ransomware files.

To restore individual files encrypted by this ransomware, try using Windows Previous Versions feature. This method is only effective if the System Restore function was enabled on an infected operating system. Note that some variants of Nemesis are known to remove Shadow Volume Copies of the files, so this method may not work on all computers.

To restore a file, right-click over it, go into Properties, and select the Previous Versions tab. If the relevant file has a Restore Point, select it and click the "Restore" button.

Restoring files encrypted by CryptoDefense

If you cannot start your computer in Safe Mode with Networking (or with Command Prompt), boot your computer using a rescue disk. Some variants of ransomware disable Safe Mode making its removal complicated. For this step, you require access to another computer.

To regain control of the files encrypted by Nemesis, you can also try using a program called Shadow Explorer. More information on how to use this program is available here.

shadow explorer screenshot

To protect your computer from file encryption ransomware such as this, use reputable antivirus and anti-spyware programs. As an extra protection method, you can use programs called HitmanPro.Alert and EasySync CryptoMonitor, which artificially implant group policy objects into the registry to block rogue programs such as Nemesis ransomware.

HitmanPro.Alert CryptoGuard - detects encryption of files and neutralises any attempts without need for user-intervention:

hitmanproalert ransomware prevention application

Malwarebytes Anti-Ransomware Beta uses advanced proactive technology that monitors ransomware activity and terminates it immediately - before reaching users' files:

malwarebytes anti-ransomware

  • The best way to avoid damage from ransomware infections is to maintain regular up-to-date backups. More information on online backup solutions and data recovery software Here.

Other tools known to remove Nemesis ransomware:

About the author:

Tomas Meskauskas

Tomas Meskauskas - expert security researcher, professional malware analyst.

I am passionate about computer security and technology. I have an experience of over 10 years working in various companies related to computer technical issue solving and Internet security. I have been working as an author and editor for pcrisk.com since 2010. Follow me on Twitter and LinkedIn to stay informed about the latest online security threats. Contact Tomas Meskauskas.

PCrisk security portal is brought by a company RCS LT. Joined forces of security researchers help educate computer users about the latest online security threats. More information about the company RCS LT.

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Removal Instructions in other languages
Malware activity

Global virus and spyware activity level today:

Medium threat activity
Medium

Increased attack rate of infections detected within the last 24 hours.

QR Code
Nemesis virus QR code
A QR code (Quick Response Code) is a machine-readable code which stores URLs and other information. This code can be read using a camera on a smartphone or a tablet. Scan this QR code to have an easy access removal guide of Nemesis virus on your mobile device.
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Platform: Windows

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