Ransomware Research
Egregor Ransomware
Egregor is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on September 1, 2020, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: Egregor Doxware.
Quick Facts
- Ransomware Family
- Egregor
- First Seen
- September 1, 2020
- Known Aliases
- Egregor Doxware
How Egregor Ransomware Works
Targeted Files
Used file marker from two DWORDs in EOF XOR'd together up to a certain values to identify encrypted files. sample.dll,DllRegisterServer -pedokremez13 --full --multiproc rundll32.exe b.dll DllRegisterServer --pass2police --full
File Encryption Patterns
Egregor modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
./\.[a-zA-Z]{4,6}$/..CRYTEKRansom Note and Payment Demands
After encrypting files, Egregor displays ransom notes demanding payment for file recovery:
RECOVER-FILES.txtRansom message:
notes/RECOVER-FILES.txt
Note locations:
EveryFolderTechnical Indicators
Associated Executable Files
The following executable files are associated with Egregor ransomware:
260828.dllb.dllqq.dll
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About This Analysis
This Egregor 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 Egregor.
Last updated: July 30, 2025