ET MALWARE IIS Backdoor CnC Command Inbound

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:".aspx"; endswith;
http.cookie;
content:"EX_TOKEN|3d|"; fast_pattern; startswith;
http.header_names;
content:!"Referer";
Raw source ET MALWARE IIS Backdoor CnC Command Inbound · Suricata
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Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET MALWARE IIS Backdoor CnC Command Inbound";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:".aspx"; endswith;
    http.cookie;
    content:"EX_TOKEN|3d|"; fast_pattern; startswith;
    http.header_names;
    content:!"Referer";
    reference:url,www.microsoft.com/security/blog/2022/07/26/malicious-iis-extensions-quietly-open-persistent-backdoors-into-servers/;
    classtype:trojan-activity;
    sid:2037845; rev:1;
    metadata:affected_product Microsoft_IIS, attack_target Web_Server, created_at 2022_07_28, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_07_28, reviewed_at 2024_09_17;
)

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