Ransomware Research

ASN1 Encoder Ransomware

ASN1 Encoder is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on November 1, 2016, this ransomware has been actively targeting systems worldwide.

Quick Facts

Ransomware Family
ASN1 Encoder
First Seen
November 1, 2016

How ASN1 Encoder Ransomware Works

Ransom Note and Payment Demands

After encrypting files, ASN1 Encoder displays ransom notes demanding payment for file recovery:

file!!!!!readme!!!!!.htm

Ransom message:

notes/!!!!!readme!!!!!.htm

Note locations:

EveryFolder

Technical Indicators

Associated Executable Files

The following executable files are associated with ASN1 Encoder ransomware:

  • 20.exe
  • radCD474.tmp.vir.HSvir
  • content
  • 1.exe
  • 68df8f82.exe
  • 4425046
  • d6834c5.exe
  • MediaInfo_DLL_0.7.90_Windows_i386.exe

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About This Analysis

This ASN1 Encoder 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 ASN1 Encoder.

Last updated: October 30, 2025

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