ET MALWARE Cobalt Strike Activity (GET)

Query · suricata

flow:established,to_server;
http.request_line;
content:"GET /azure/v2/api HTTP/1.1"; fast_pattern;
http.user_agent;
content:"MusicBee/3.4"; bsize:12;
http.header_names;
content:!"Referer";
content:"|0d 0a|Host|0d 0a|Connection|0d 0a|Cache-Control|0d 0a|"; startswith;
http.cookie;
content:"HSID="; startswith;
Raw source ET MALWARE Cobalt Strike 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 Cobalt Strike Activity (GET)";
    flow:established,to_server;
    http.request_line;
    content:"GET /azure/v2/api HTTP/1.1"; fast_pattern;
    http.user_agent;
    content:"MusicBee/3.4"; bsize:12;
    http.header_names;
    content:!"Referer";
    content:"|0d 0a|Host|0d 0a|Connection|0d 0a|Cache-Control|0d 0a|"; startswith;
    http.cookie;
    content:"HSID="; startswith;
    reference:url,twitter.com/Unit42_Intel/status/1470778363254128651;
    reference:md5,b873bfa8dec8c3a1f62c30903e59e849;
    classtype:trojan-activity;
    sid:2034726; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2021_12_14, deployment Perimeter, malware_family CobaltStrike, confidence Medium, signature_severity Major, tag c2, updated_at 2021_12_14, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)

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