ET MALWARE Specter Insight Beacon CnC Checkin M2

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri; bsize:62<>66;
content:"/threads/"; startswith;
pcre:"/^[a-f0-9]{32}/R";
content:"/messages|3f|filter|3d|"; fast_pattern; within:17;
pcre:"/^\d{5,7}$/R";
target:src_ip;
Raw source ET MALWARE Specter Insight Beacon CnC Checkin M2 · 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE Specter Insight Beacon CnC Checkin M2";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri; bsize:62<>66;
    content:"/threads/"; startswith;
    pcre:"/^[a-f0-9]{32}/R";
    content:"/messages|3f|filter|3d|"; fast_pattern; within:17;
    pcre:"/^\d{5,7}$/R";
    reference:md5,0f1bab742523821d833701f82a328c2b;
    reference:url,practicalsecurityanalytics.com/specterinsight/;
    classtype:trojan-activity;
    sid:2061551; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2025_04_14, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag C2_Framework, updated_at 2025_04_14, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
    target:src_ip;
)

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