Ransomware Research

BTCWare-PayDay Ransomware

BTCWare-PayDay is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on October 1, 2017, this ransomware has been actively targeting systems worldwide.

Quick Facts

Ransomware Family
BTCWare-PayDay
First Seen
October 1, 2017

How BTCWare-PayDay Ransomware Works

File Encryption Patterns

BTCWare-PayDay modifies encrypted files using specific patterns to mark them as encrypted:

File extensions added after encryption:

..payday..shadow..wallet

Ransom Note and Payment Demands

After encrypting files, BTCWare-PayDay displays ransom notes demanding payment for file recovery:

file!! RETURN FILES !!.txt

Ransom message:

notes/!! RETURN FILES !!.txt

Note locations:

RootDiscs
filepayday.hta

Ransom message:

notes/payday.hta

Note locations:

Roaming
file! FILES ENCRYPTED.txt

Ransom message:

notes/! FILES ENCRYPTED.txt

Note locations:

RootDiscs
file! How Decrypt Files.txt

Ransom message:

notes/! How Decrypt Files.txt

Technical Indicators

Associated Executable Files

The following executable files are associated with BTCWare-PayDay ransomware:

  • payday.exe
  • payload.exe
  • sample-unpacked
  • isso32.exe
  • machine.exe
  • cryptomafia@tuta.io.exe

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About This Analysis

This BTCWare-PayDay 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 BTCWare-PayDay.

Last updated: October 30, 2025

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