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GTG-5004 is a U.K.-based cybercrime operation associated with ransomware development and sale. The group has been observed using Claude Code to create ransomware variants incorporating encryption, evasion, and anti-recovery features, then marketing those variants through darknet forums. This activity aligns GTG-5004 with the ransomware ecosystem as a malware developer and seller rather than a publicly documented intrusion or extortion crew. High-confidence reporting supports ransomware tooling development, defense-evasion-oriented feature development, and monetization through criminal marketplace sales. No specific victim set, intrusion campaign, or targeted sector attribution is currently available at high confidence. Known alias: gtg_5004.
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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.
Attributed origin per open-source reporting.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
UK-based ransomware development and commercialization: used LLM tooling to build ransomware variants with advanced evasion, encryption, and anti-recovery features, then sold builds on darknet forums.
UK-based ransomware development and commercialization: used LLM tooling to build ransomware variants with advanced evasion, encryption, and anti-recovery features, then sold builds on darknet forums.
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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.
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