Ransomware Research
SifreCozucu Ransomware
SifreCozucu is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on May 1, 2020, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: TurkSifre, B@H}!ER@, Bahtier.
Quick Facts
- Ransomware Family
- SifreCozucu
- First Seen
- May 1, 2020
- Known Aliases
- TurkSifreB@H}!ER@Bahtier
How SifreCozucu Ransomware Works
Targeted Files
NOSAMPLE https://www.bleepingcomputer.com/forums/t/718631
File Encryption Patterns
SifreCozucu modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
.\.[A-F0-9]{12}$.__Mail_[sifre_cozucu@protonmail.com]__Site_[www.dosyacozd4iprkd7.onion]Ransom Note and Payment Demands
After encrypting files, SifreCozucu displays ransom notes demanding payment for file recovery:
_ONEMLI_LUTFEN_OKUYUNUZ.TXTRansom message:
notes/_ONEMLI_LUTFEN_OKUYUNUZ.TXT
/^_ONEMLI_LUTFEN_OKUYUNUZ_[A-F0-9]{12}\.txt$/Ransom message:
notes/_ONEMLI_LUTFEN_OKUYUNUZ_E03F491BEF51.txt
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About This Analysis
This SifreCozucu 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 SifreCozucu.
Last updated: July 30, 2025