ET MALWARE MSIL/Document Stealer Exfil

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.header_names;
content:"|0d 0a|nnnnnnnmmmmmmmmmmmeeeee|0d 0a|";
http.content_type;
content:"multipart/form-data|3b|"; startswith;
http.header;
content:"__IIIIMMMMM|0d 0a|"; fast_pattern;
Raw source ET MALWARE MSIL/Document Stealer Exfil · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE MSIL/Document Stealer Exfil";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.header_names;
    content:"|0d 0a|nnnnnnnmmmmmmmmmmmeeeee|0d 0a|";
    http.content_type;
    content:"multipart/form-data|3b|"; startswith;
    http.header;
    content:"__IIIIMMMMM|0d 0a|"; fast_pattern;
    reference:md5,8df25eee669d222ab9e002ac7d81228f;
    classtype:trojan-activity;
    sid:2033818; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_08_27, deployment Perimeter, malware_family MSIL_Document, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_08_27;
)

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