Ransomware Research

AnteFrigus Ransomware

AnteFrigus is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on November 1, 2019, this ransomware has been actively targeting systems worldwide.

Quick Facts

Ransomware Family
AnteFrigus
First Seen
November 1, 2019

How AnteFrigus Ransomware Works

File Encryption Patterns

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

File extensions added after encryption:

./\.[a-z]{4,6}$/

Ransom Note and Payment Demands

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

file/^[a-z]{4,6}-readme\.txt$/

Ransom message:

notes/qrja-readme.txt

Note locations:

EveryFolder
file/^CLICK_HERE-[a-z]{4,6}\.txt$/

Ransom message:

notes/CLICK_HERE-eadfda.txt

Note locations:

EveryFolder
file/^ATTENTION-[a-z]{4,6}-README\.txt$/

Ransom message:

notes/ATTENTION-daaefc-README.txt

Note locations:

EveryFolder

Technical Indicators

Associated Executable Files

The following executable files are associated with AnteFrigus ransomware:

  • Trojan.Ransom.AnteFrigus.exe
  • rad26628.tmp.exe
  • out
  • directx_update.exe
  • 03-31_47.254.179.98_FEACCFFC7990693228933D5A5F67B833_DirectX_Update.exe
  • DirectX_Update.exe
  • DirectX_Update[1].exe
  • R7KIOWY5.exe

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About This Analysis

This AnteFrigus 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 AnteFrigus.

Last updated: July 30, 2025

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