Ransomware Research
Sigma Ransomware
Sigma is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on November 1, 2017, this ransomware has been actively targeting systems worldwide.
Quick Facts
- Ransomware Family
- Sigma
- First Seen
- November 1, 2017
How Sigma Ransomware Works
Targeted Files
https://www.bleepingcomputer.com/news/security/sigma-ransomware-being-distributed-using-fake-craigslist-malspam/ https://www.hybrid-analysis.com/sample/8d54dbe841c95ba67549e8e28a4fbddbf87032e8736f01ec5a4563d3f7e6bfe1?environmentId=100 https://blog.comodo.com/pc-security/subpoena-new-variant-of-sigma-ransomware/ 84f03ec8a70a697d06714ab6222930d043e9c3a386752eb29cc958fb3a7a5ccd -> requires TOR-communication
Ransom Note and Payment Demands
After encrypting files, Sigma displays ransom notes demanding payment for file recovery:
ReadMe.txtRansom message:
notes/ReadMe.txt
ReadMe.htmlTechnical Indicators
Associated Executable Files
The following executable files are associated with Sigma ransomware:
Sigma.exeAutomated Universal MultiBoot UFD Creation Tool.exesvchost.exesvchost (2).exeGUID.exe.binGUID.exeMarquis Resume.docTeofila Resume.docTemple Resume.docRegina Resume.docGarey Resume.docElwyn Resume.docBelinda Resume.docmyfile.exetaskwgr.exe
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About This Analysis
This Sigma 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 Sigma.
Last updated: July 30, 2025