COMMAND_AND_CONTROL Mythic C2 SMB P2P Beacon

Tim Peck@timpeck

•updated Dec 11, 2025•1•106

This rule detects Command and Control (C2) communication associated with the Mythic C2 framework utilizing Server Message Block (SMB) for peer-to-peer (P2P) beaconing. It specifically looks for SMB_COM_WRITE_ANDX commands with a data size greater than 360 bytes, containing a specific null byte pattern at offset 86, and a PCRE match for a GUID-like string, which are indicators of Mythic C2 SMB P2P beacon traffic.