ET MALWARE Win32/BlackRain CnC Activity

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.header_names;
content:!"Referer";
http.request_body;
content:"action="; startswith;
content:"&botID="; fast_pattern;
pcre:"/^(?:[a-z0-9]{40})$/R";
threshold:type limit,seconds 300,count 1,track by_src;
Raw source ET MALWARE Win32/BlackRain CnC Activity · 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE Win32/BlackRain CnC Activity";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.header_names;
    content:!"Referer";
    http.request_body;
    content:"action="; startswith;
    content:"&botID="; fast_pattern;
    pcre:"/^(?:[a-z0-9]{40})$/R";
    threshold:type limit,seconds 300,count 1,track by_src;
    reference:md5,7c711ea527dece150c377ba6ea303173;
    classtype:trojan-activity;
    sid:2049802; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_12_20, deployment Perimeter, malware_family Win32_BlackRain, confidence High, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_12_20;
)

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