ET MALWARE FIN12 Related WEIRDLOOP/Cobalt Strike Beacon Activity (GET)

Query · suricata

flow:established,to_server;
http.request_line;
content:"GET|20|/image-directory/bn.ico|20|HTTP/1.1"; fast_pattern;
http.header_names;
content:"|0d 0a|Connection|0d 0a|Accept-Language|0d 0a|User-Agent|0d 0a|Host|0d 0a|Cache-Control|0d 0a 0d 0a|";
http.accept_lang;
content:"en-GB|3b|q=0.9,|20|*|3b|q=0.7"; bsize:20;
Raw source ET MALWARE FIN12 Related WEIRDLOOP/Cobalt Strike Beacon Activity (GET) · 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 FIN12 Related WEIRDLOOP/Cobalt Strike Beacon Activity (GET)";
    flow:established,to_server;
    http.request_line;
    content:"GET|20|/image-directory/bn.ico|20|HTTP/1.1"; fast_pattern;
    http.header_names;
    content:"|0d 0a|Connection|0d 0a|Accept-Language|0d 0a|User-Agent|0d 0a|Host|0d 0a|Cache-Control|0d 0a 0d 0a|";
    http.accept_lang;
    content:"en-GB|3b|q=0.9,|20|*|3b|q=0.7"; bsize:20;
    reference:md5,fd81452a3a8f9460ffac8aff6e20431a;
    reference:url,www.mandiant.com/resources/fin12-ransomware-intrusion-actor-pursuing-healthcare-targets;
    classtype:trojan-activity;
    sid:2034186; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2021_10_13, deployment Perimeter, deployment SSLDecrypt, malware_family CobaltStrike, malware_family Fin12, confidence Medium, signature_severity Major, tag c2, updated_at 2021_10_13, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)

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