ET USER_AGENTS Observed Malicious User-Agent (CobaltStrike)

Query · suricata

flow:to_server,established;
http.user_agent;
content:"Mozilla/5.0_Frsg_stredf_o21_crown_type"; startswith; fast_pattern;
Raw source ET USER_AGENTS Observed Malicious User-Agent (CobaltStrike) · 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 USER_AGENTS Observed Malicious User-Agent (CobaltStrike)";
    flow:to_server,established;
    http.user_agent;
    content:"Mozilla/5.0_Frsg_stredf_o21_crown_type"; startswith; fast_pattern;
    reference:md5,b8b7a10dcc0dad157191620b5d4e5312;
    classtype:trojan-activity;
    sid:2035537; rev:2;
    metadata:attack_target Client_Endpoint, created_at 2022_03_18, deployment Perimeter, malware_family Cobalt_Strike, confidence High, signature_severity Major, updated_at 2022_03_18, reviewed_at 2024_05_07, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1001, mitre_technique_name Data_Obfuscation;
)

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