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    Suspicious Python Execution of CAT File

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    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/)
    Kaung Khant Ko@kaungkhantko
    •updated Jun 15, 2026•5•0•38

    Detects execution of a Python runtime loading a compiled bytecode file disguised with a '.cat' extension, a key defense evasion technique of NarwhalRAT.

    Sigma

    Tags

    T1036.004 - Masquerade Task or ServiceT1059.006 - PythonTA0005 - Defense EvasionTA0002 - ExecutionProcess CreationWindowsWindows Eventlog Securityattack.defense-evasionattack.t1036.004attack.executionattack.t1059.006attack.ta0005

    Found in

    • Analysis of APT37 NarwhalRAT Using MS-Themed PhishingLast updated Jun 15, 2026

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