ET MALWARE FIN7 JSSLoader Variant Activity (POST)

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.uri;
content:"/?id="; startswith; fast_pattern;
pcre:"/^[a-zA-z]{5,10}_[A-F0-9]{12}$/R";
http.header_names;
content:!"Referer";
content:!"Accept";
Raw source ET MALWARE FIN7 JSSLoader Variant Activity (POST) · 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 $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE FIN7 JSSLoader Variant Activity (POST)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"/?id="; startswith; fast_pattern;
    pcre:"/^[a-zA-z]{5,10}_[A-F0-9]{12}$/R";
    http.header_names;
    content:!"Referer";
    content:!"Accept";
    reference:url,twitter.com/z0ul_/status/1399764964521488384;
    reference:md5,6a20636bed7deafe7317400bd18c7b9e;
    classtype:trojan-activity;
    sid:2033072; rev:2;
    metadata:attack_target Client_Endpoint, created_at 2021_06_02, deployment Perimeter, deployment SSLDecrypt, malware_family jssLoader, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_06_02;
)

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