ET RETIRED Win32/Delf.TJJ CnC Checkin M1

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"/index/getcfg?id="; fast_pattern; startswith;
pcre:"/^\d{3,6}$/R";
http.header_names;
content:!"Referer";
content:"|0d 0a|Host|0d 0a|Accept|0d 0a|Accept-Encoding|0d 0a|User-Agent|0d 0a 0d 0a|";
http.user_agent;
content:"Mozilla/3.0|20 28|compatible|3b 20|Indy Library|29|";
Raw source ET RETIRED Win32/Delf.TJJ CnC Checkin M1 · 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 -> $EXTERNAL_NET any (
    msg:"ET RETIRED Win32/Delf.TJJ CnC Checkin M1";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/index/getcfg?id="; fast_pattern; startswith;
    pcre:"/^\d{3,6}$/R";
    http.header_names;
    content:!"Referer";
    content:"|0d 0a|Host|0d 0a|Accept|0d 0a|Accept-Encoding|0d 0a|User-Agent|0d 0a 0d 0a|";
    http.user_agent;
    content:"Mozilla/3.0|20 28|compatible|3b 20|Indy Library|29|";
    reference:md5,2e7b9acaf5725c84c9ec9687af15d48e;
    classtype:trojan-activity;
    sid:2037107; rev:2;
    metadata:attack_target Client_Endpoint, created_at 2022_06_24, deployment Perimeter, former_category MALWARE, malware_family Delf_TJJ, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_04_17, reviewed_at 2025_04_17;
)

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