Ransomware Research
Nemesis Ransomware
Nemesis is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on May 1, 2017, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: Nemesis NextGen.
Quick Facts
- Ransomware Family
- Nemesis
- First Seen
- May 1, 2017
- Known Aliases
- Nemesis NextGen
How Nemesis Ransomware Works
Targeted Files
https://app.any.run/tasks/39088d71-f735-49b2-9c3c-3b4716bc4fb2/# https://www.hybrid-analysis.com/sample/93797b5fffe31a196574ea46145546eb0d02d527f3f08de968f57ad70fca9bdf?environmentId=100 Requires C&C 392d7a5c0f452b0e94d27f1d8a0c1406fa25af4c4fe9551840b60b871fa676e8 -> can be emulated with FakeNetNG
File Encryption Patterns
Nemesis modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
../\.[a-z0-9]{4,5}$/..YOUR_LAST_CHANCE..WECANHELP..nemesis..t5019..aax55Ransom Note and Payment Demands
After encrypting files, Nemesis displays ransom notes demanding payment for file recovery:
### DECRYPT MY FILES ###.html### DECRYPT MY FILES ###.txtRansom message:
notes/### DECRYPT MY FILES ###.txt
Note locations:
EveryFolder_RESTORE FILES_.txtRansom message:
notes/_RESTORE FILES_.txt
Note locations:
EveryFolderTechnical Indicators
Associated Executable Files
The following executable files are associated with Nemesis ransomware:
svchost.exe_sample.exelock.exe
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About This Analysis
This Nemesis ransomware analysis is part of Elastio's comprehensive ransomware detection database. Elastio provides advanced ransomware protection and recovery solutions, helping organizations defend against and recover from ransomware attacks like Nemesis.
Last updated: July 30, 2025