ET MALWARE NCSC XAgent Beacon

Query · suricata

flow:established,to_server;
content:"HTTP/1.1|0d 0a|Accept|3a|text/html,application/xhtml+xml,application/xml|3b|q=0.9,*";
content:!"Host|3a| yandex.ru";
pcre:"/^(?:GET|POST)\/(?:watch|search|find|results|open|search|close)\/\?(?:text=|from=|aq=|ai=|ags=|oe=|btnG=|oprnd=|utm=|channel=|itwm=)/";
Raw source ET MALWARE NCSC XAgent Beacon · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tcp $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE NCSC XAgent Beacon";
    flow:established,to_server;
    content:"HTTP/1.1|0d 0a|Accept|3a|text/html,application/xhtml+xml,application/xml|3b|q=0.9,*";
    content:!"Host|3a| yandex.ru";
    pcre:"/^(?:GET|POST)\/(?:watch|search|find|results|open|search|close)\/\?(?:text=|from=|aq=|ai=|ags=|oe=|btnG=|oprnd=|utm=|channel=|itwm=)/";
    reference:url,www.ncsc.gov.uk/content/files/protected_files/article_files/IOC-APT28-malware-advisory.pdf;
    classtype:targeted-activity;
    sid:2026437; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2018_10_04, deployment Perimeter, confidence Medium, signature_severity Major, tag c2, updated_at 2019_07_26, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)

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