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yokyok is a minimally attributed threat actor identifier referenced in FreePBX malware analysis as a rival operator whose artifacts were removed by another criminal VoIP toll-fraud campaign. The only directly stated attribution is that "yokyok" was used as a webshell signature. Breakglass Intelligence reported that a March 2026 FreePBX malware variant systematically searched FreePBX web directories for competitor signature strings including "yokyok" and deleted matching files, indicating yokyok had previously implanted webshells or related tooling on vulnerable internet-exposed FreePBX infrastructure. No further attribution, targeting, nationality, or operational details are available in the provided content. Known alias: yokyok.
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Every observed MITRE ATT&CK technique, grouped by tactic.
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