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Ransoomed is a Windows-focused ransomware strain reported by CYFIRMA on 2026-02-13 and described as active since late 2025. It encrypts victim files, appends the ".ransoomed" extension, and drops a ransom note named "!!!READ_ME!!!.txt". The note claims the data is encrypted with AES-256 and RSA-2048, demands 2.5 Bitcoin, instructs victims to send proof of payment to an OnionMail address, sets a 72-hour deadline, and threatens permanent key destruction after seven days. Reported defense-evasion behavior includes disabling Windows Firewall and modifying registry keys under HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Themes\Personalize and HKEY_CURRENT_USER\Software\Microsoft\Command Processor. The reporting maps the malware to ATT&CK techniques including T1059, T1129, T1027, T1070, T1070.006, T1497, T1497.001, T1057, T1082, and T1083. No free or verified decryptor was reported, and there is no confirmed evidence that paying the ransom results in data restoration. High-confidence indicators mentioned in the content include the ".ransoomed" file extension and the ransom note filename "!!!READ_ME!!!.txt".
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14 distinct techniques documented for this family, organized by ATT&CK tactic.
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Extortion-focused ransomware active since late 2025 that encrypts local files, appends the ".ransoomed" extension, and drops ransom notes (e.g., "!!!READ_ME!!!.txt") demanding cryptocurrency payment for a purported decryptor.
Extortion-focused ransomware active since late 2025 that encrypts local files, appends the .ransoomed extension, and drops ransom notes (e.g., !!!READ_ME!!!.txt) demanding cryptocurrency payment for a purported decryptor.
Match every observed IP, domain, and hash against your live telemetry.
Named campaigns wielding this family, with evidence pinned to each claim.
CVEs this family uses for access and lateral movement.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Every documented technique, ranked by evidence weight.
Reddit, Mastodon, and CTI community discussion around this family.