ET MALWARE Specter Insight Beacon CnC Checkin M1

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|"; within:17;
pcre:"/^\d{5,7}$/R";
http.user_agent; bsize:16;
content:"Evernote Windows"; fast_pattern;
Raw source ET MALWARE Specter Insight Beacon 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE Specter Insight Beacon CnC Checkin M1";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri; bsize:62<>66;
    content:"/threads/"; startswith;
    pcre:"/^[a-f0-9]{32}/R";
    content:"/messages|3f|filter|3d|"; within:17;
    pcre:"/^\d{5,7}$/R";
    http.user_agent; bsize:16;
    content:"Evernote Windows"; fast_pattern;
    reference:url,practicalsecurityanalytics.com/specterinsight/;
    reference:md5,612e27b5df944f1591bfc5d1bc17a153;
    classtype:trojan-activity;
    sid:2061025; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_and_Server, tls_state plaintext, created_at 2025_03_24, deployment Perimeter, malware_family Specter_Insight, 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 T1567, mitre_technique_name Exfiltration_Over_Web_Service;
)

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