Ransomware Research

Avaddon Ransomware

Avaddon is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on June 1, 2020, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: Avaddon Doxware.

Quick Facts

Ransomware Family
Avaddon
First Seen
June 1, 2020
Known Aliases
Avaddon Doxware

How Avaddon Ransomware Works

File Encryption Patterns

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

File extensions added after encryption:

..avdn./\.[A-Ea-e0-9]{10}$/

Ransom Note and Payment Demands

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

filereadme.html

Ransom message:

notes/readme.html

Note locations:

EveryFolder
file1_readme.html

Ransom message:

notes/1_readme.html

Note locations:

RootDiscsDesktop
file/^[A-Za-z0-9]{2,8}_readme_?\.txt$/

Ransom message:

notes/STdKp4_readme.txt

Note locations:

EveryFolder
file/^[A-Za-z0-9]{2,8}-readme_?\.html$/

Ransom message:

notes/265155-readme.html

Note locations:

EveryFolder
screenshot

Ransom message:

notes/bckgrd.png

Note locations:

Desktop

Technical Indicators

Associated Executable Files

The following executable files are associated with Avaddon ransomware:

  • software.exe
  • file.exe
  • program.exe
  • executable.exe
  • old.exe
  • sava.exe
  • jpr.exe
  • img05960602020-jpg.scr
  • temp27472466.exe
  • 5737263.exe
  • vget.exe
  • vnget.exe
  • 5203508738.exe
  • 646246465.exe
  • 647274456.exe
  • 6247427.exe
  • 237502353.exe
  • taskhost.exe
  • wtava_1.exe
  • tava_1.exe
  • tava.exe
  • wtava.exe
  • tspm.exe
  • 4939394.exe
  • 7865336.exe
  • 75365357.exe
  • temp377346.exe
  • 05750050.exe
  • 5893938.exe
  • 58839304.exe
  • bit4bc0.tmp
  • lkx999.exe
  • SendDebugLog.exe
  • 1.exe
  • QkpxnTb.exe
  • rdp.exe
  • rdp.bin.exe
  • Avaddon.exe
  • exe_PPHK.exe

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About This Analysis

This Avaddon 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 Avaddon.

Last updated: October 30, 2025

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