ET MALWARE Cobalt Strike Activity (GET)

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"/users/"; startswith;
content:"/endpoints/events/poll"; endswith;
http.referer;
content:"https://teams.microsoft.com/_"; bsize:29;
http.accept;
content:"json"; bsize:4;
http.header;
content:"|0d 0a|Authentication|3a 20|skypetoken=eyJhbGciOi"; fast_pattern;
content:"|0d 0a|x-ms-session-id|3a 20|f73c3186-057a-d996-3b63-";
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:"/users/"; startswith;
#    content:"/endpoints/events/poll"; endswith;
#    http.referer;
#    content:"https://teams.microsoft.com/_"; bsize:29;
#    http.accept;
#    content:"json"; bsize:4;
#    http.header;
#    content:"|0d 0a|Authentication|3a 20|skypetoken=eyJhbGciOi"; fast_pattern;
#    content:"|0d 0a|x-ms-session-id|3a 20|f73c3186-057a-d996-3b63-";
#    reference:md5,2daf4f1dbdc4a3d9726f9b447225113a;
#    reference:url,tarlogic.com/blog/hidding-cobalt-strike-traffic;
#    classtype:trojan-activity;
#    sid:2036824; rev:2;
#    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_06_02, deployment Perimeter, deprecation_reason Age, malware_family Cobalt_Strike, confidence Medium, signature_severity Major, updated_at 2024_12_02, reviewed_at 2024_12_02, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1001, mitre_technique_name Data_Obfuscation;
#)

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