ET MALWARE Unknown Rootkit Checkin Activity (getSystemInfo)

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"/api/system/getSystemInfo"; bsize:25; fast_pattern;
http.user_agent;
content:"Http-connect"; bsize:12;
Raw source ET MALWARE Unknown Rootkit Checkin Activity (getSystemInfo) · 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 Unknown Rootkit Checkin Activity (getSystemInfo)";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/api/system/getSystemInfo"; bsize:25; fast_pattern;
    http.user_agent;
    content:"Http-connect"; bsize:12;
    reference:md5,3f295401fa59a32ff7a11551551ec607;
    reference:url,twitter.com/starsSk87264403/status/1422543872853426198;
    classtype:trojan-activity;
    sid:2033648; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2021_08_03, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_08_03;
)

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