ET MALWARE Cobalt Strike Activity (GET)

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"/loadercrypt_"; startswith; fast_pattern;
content:".php?vid="; distance:32; within:9;
isdataat:171,relative;
http.user_agent;
content:"Mozilla/5.0|20|(Windows|20|NT|20|6.1)|20|AppleWebKit/587.38"; bsize:47;
Raw source ET MALWARE Cobalt Strike Activity (GET) · 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 Cobalt Strike Activity (GET)";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/loadercrypt_"; startswith; fast_pattern;
    content:".php?vid="; distance:32; within:9;
    isdataat:171,relative;
    http.user_agent;
    content:"Mozilla/5.0|20|(Windows|20|NT|20|6.1)|20|AppleWebKit/587.38"; bsize:47;
    reference:url,twitter.com/malwrhunterteam/status/1452992872928661512;
    reference:md5,aa1add403d79f0ae38f8b0aed2fcb0c2;
    classtype:trojan-activity;
    sid:2034267; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2021_10_27, deployment Perimeter, confidence Medium, signature_severity Major, tag c2, updated_at 2021_10_27, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)

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