Ransomware Research

Sodinokibi Ransomware

Sodinokibi is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on April 1, 2019, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: Sodinokibi Doxware, BlueBackground, REvil.

Quick Facts

Ransomware Family
Sodinokibi
First Seen
April 1, 2019
Known Aliases
Sodinokibi DoxwareBlueBackgroundREvil

How Sodinokibi Ransomware Works

Targeted Files

https://app.any.run/tasks/9a9a7109-8497-4e1e-b3d7-b9ab0871ea9e/ Encrypts first 0x100000 bytes; Ex filenames -> 2gi81a0o-readme.txt;fpa6378b9h-readme.txt;hg6u62-readme.txt

File Encryption Patterns

Sodinokibi modifies encrypted files using specific patterns to mark them as encrypted:

File extensions added after encryption:

./\.[a-z0-9]{6,10}$/

Ransom Note and Payment Demands

After encrypting files, Sodinokibi displays ransom notes demanding payment for file recovery:

file/^[a-z0-9]{5,10}-readme\.txt$/

Ransom message:

notes/kww38r-readme.txt

Note locations:

EveryFolder
file/^[a-z0-9]{5,10}-README\.txt$/

Ransom message:

notes/rxk20-README.txt

Note locations:

EveryFolder
file/^[a-z0-9]{5,10}-HOW-TO-DECRYPT\.txt$/

Ransom message:

notes/c7mjpia4-HOW-TO-DECRYPT.txt

Note locations:

EveryFolder
file/^[a-z0-9]{5,10}-PLEASE-README-THIS\.txt$/

Ransom message:

notes/6l3l43wj-PLEASE-README-THIS.txt

Note locations:

EveryFolder
file/^[a-f0-9]{6}\.info\.txt$/

Ransom message:

notes/e728a6.info.txt

Note locations:

EveryFolder
file/^[a-z0-9]{5,10}-read-me-ATTRATTIVO\.txt$/

Ransom message:

notes/0f155qd6j-read-me-ATTRATTIVO.txt

Note locations:

EveryFolder
file/^[a-z0-9]{5,10}-HELP-NEED\.txt$/

Ransom message:

notes/e9pf8q6-HELP-NEED.txt

Note locations:

EveryFolder
file/^ATTENTION-[a-z0-9]{5,10}-README\.txt$/

Ransom message:

notes/ATTENTION-1n4voi498e-README.txt

Note locations:

EveryFolder

Technical Indicators

Associated Executable Files

The following executable files are associated with Sodinokibi ransomware:

  • 9Maghszwd0GXsSso.exe
  • sodinokibi.exe
  • untitled.exe
  • 3WaiFPGQ.exe
  • ransomware.exe
  • s.exe
  • linux.linux
  • colorui.dll
  • June document

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About This Analysis

This Sodinokibi 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 Sodinokibi.

Last updated: July 30, 2025

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