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    Suspicious File Drop by Exchange IIS Worker Process

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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/)
    SigmaHQ Detections@sigmaHQ
    •updated Aug 12, 2024•0•29

    Detects suspicious file types (such as web shells, scripts, or executables) being dropped by the IIS worker process (w3wp.exe) associated with Microsoft Exchange. This behavior is indicative of successful exploitation of Exchange vulnerabilities, often leading to the deployment of web shells for persistent access.

    Sigma

    Tags

    T1190 - Exploit Public-Facing ApplicationT1505.003 - Web ShellTA0001 - Initial AccessTA0003 - PersistenceFile CreationWindowsMicrosoft IisMicrosoft Exchange ServerCVE-2022-41040CVE-2022-41082attack.persistenceattack.t1190attack.initial-accessattack.t1505.003

    Found in

    • Play Ransomware: The Shadow SyndicateLast updated 13 days ago
    • CVE-2026-45504: Exchange SSRF Leading to Local File ReadLast updated Jul 2, 2026
    • SystemBC Malware: SOCKS5 Proxy and Backdoor IntelligenceLast updated Jun 29, 2026
    • StrikeShark SharkLoader Campaign Delivering Cobalt StrikeLast updated Jun 26, 2026

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