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    Raw TCP C2 Beacon to 212.34.141.103:4521 (MSBuild.exe abuse)

    avatar
    GlassDiceBearhttps://www.dicebear.comhttps://creativecommons.org/publicdomain/zero/1.0/„Glass” (https://www.dicebear.com) by „DiceBear”, licensed under „CC0 1.0” (https://creativecommons.org/publicdomain/zero/1.0/)
    Ibrahim Saud@tektrix
    •updated 19 days ago•0•0•1

    This rule monitors for outbound TCP traffic from internal hosts to a specific IP address (212.34.141.103) on port 4521, which is associated with C2 beaconing behavior, potentially involving the abuse of MSBuild.exe as a LOLBin.

    Suricata

    Tags

    T1095 - Non-Application Layer ProtocolT1571 - Non-Standard PortT1127.001 - MSBuildTA0005 - StealthTA0002 - ExecutionNetwork Connection OutboundIDS IPS AlertWindowsNetwork GenericSuricata IDSSnort IDSTCPTrojan Activity

    Found in

    • Intelligence-Driven Threat Hunting GuideLast updated Jun 10, 2026

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