ET MALWARE FIN7 JSSLoader Activity (POST)

Query · suricata

flow:established,to_server;
http.request_line;
content:"POST /?id="; startswith; fast_pattern;
http.uri;
pcre:"/^\/\?id\=[A-Z]{12,28}[0-9]$/";
http.header_names;
content:"|0d 0a|Host|0d 0a|Content-Length|0d 0a|Expect|0d 0a|Connection|0d 0a 0d 0a|"; bsize:46;
Raw source ET MALWARE FIN7 JSSLoader 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE FIN7 JSSLoader Activity (POST)";
    flow:established,to_server;
    http.request_line;
    content:"POST /?id="; startswith; fast_pattern;
    http.uri;
    pcre:"/^\/\?id\=[A-Z]{12,28}[0-9]$/";
    http.header_names;
    content:"|0d 0a|Host|0d 0a|Content-Length|0d 0a|Expect|0d 0a|Connection|0d 0a 0d 0a|"; bsize:46;
    reference:md5,6f743e8fda2031db9907a8d6bd0a41a8;
    reference:url,blog.morphisec.com/new-jssloader-trojan-delivered-through-xll-files;
    classtype:trojan-activity;
    sid:2035609; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2022_03_25, deployment Perimeter, deployment SSLDecrypt, malware_family FIN7, malware_family CarbonSpider, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_03_25;
)

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