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
Targeted Files
Full extension -> .[aversia@tuta.io]-id-0.payday
File Encryption Patterns
BTCWare-PayDay modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..payday..shadow..walletRansom Note and Payment Demands
After encrypting files, BTCWare-PayDay displays ransom notes demanding payment for file recovery:
!! RETURN FILES !!.txtRansom message:
notes/!! RETURN FILES !!.txt
Note locations:
RootDiscspayday.htaRansom message:
notes/payday.hta
Note locations:
Roaming! FILES ENCRYPTED.txtRansom message:
notes/! FILES ENCRYPTED.txt
Note locations:
RootDiscs! How Decrypt Files.txtRansom message:
notes/! How Decrypt Files.txt
Technical Indicators
Associated Executable Files
The following executable files are associated with BTCWare-PayDay ransomware:
payday.exepayload.exesample-unpackedisso32.exemachine.execryptomafia@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: July 30, 2025