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Metaencryptor is a ransomware threat actor active by at least 2023 and still observed in victim-posting activity in 2026. The group has been associated with enterprise intrusions in which operators used the .NET-based remote access trojan CSHARP-STREAMER as part of post-compromise operations. Observed tradecraft includes rapid use of relay functionality to bridge segmented networks, extensive use of Windows PowerShell for hands-on-keyboard activity, and domain-user enumeration. CSHARP-STREAMER modules observed in operations linked to Metaencryptor include capabilities for keylogging, file transfer, relay, remote execution, credentialed SMB access, and process spawning, indicating a modular intrusion set tailored to operational needs. Metaencryptor has shown interest in IT service providers, suggesting a focus on organizations that can provide broad downstream access or operational leverage. Reporting also assessed that at least some Metaencryptor intrusions may involve access obtained from an initial access broker, based on shifts in tactics, techniques, and procedures during incident response casework. The actor appears in the broader ransomware ecosystem alongside other groups that have used CSHARP-STREAMER, supporting the view that some tooling may be shared, customized per campaign, or obtained as a service. By June 2026, Metaencryptor remained one of the more active ransomware brands by publicly observed victim cases. High-confidence reporting supports classifying the actor as financially motivated and engaged in ransomware-driven extortion, but the available information does not directly establish additional specifics such as leak-site operations or double-extortion behavior for this actor.
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Who, where, and (when attributed) which flag flies behind the operation. Pulled from open-source reporting and Mallory's analyst review.
Sectors the actor has been observed targeting.
24 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
1 malware family attributed to this actor across reporting.
1 indicator attributed to this actor: domains, IPs, hashes, and other artifacts pulled from reporting. View more in app.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Ransomware group listed among the top active groups in June 2026.
Ransomware threat actor observed using the CSHARP-STREAMER RAT in attacks, with a stated special interest in IT service providers. In the described incident, the actor used the RAT mainly to run PowerShell scripts, perform discovery, relay traffic between network segments, move laterally, and deploy ransomware for encryption and destruction activities.
Ransomware group reported as an observed incident driver against industrial organizations in Q4 2023; also listed as first observed by Dragos in Q4 2023.
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Every observed MITRE ATT&CK technique, grouped by tactic.
Families this actor is known to deploy, with IOCs and behavior.
CVEs this actor has used in known campaigns.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Domains, IPs, and hashes tied to this actor, refreshed continuously.