Rule History

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Cobalt Strike Malleable C2 (QiHoo Profile)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:!"."; http.accept; content:"text/html,application/xhtml+xml,application/xml|3b|q=0.9,image/webp,image/apng,*/*|3b|q=0.8"; bsize:85; content:!"application/signed-exchange"; http.user_agent; content:"Mozilla/5.0 (Linux|3b 20|Android 4.1.1|3b 20|Nexus 7 Build/JRO03D) AppleWebKit/535.19 (KHTML, like Gecko) Chrome/18.0.1025.166 Safari"; bsize:123; content:!"Safari/535.19"; http.cookie; content:"__guid="; depth:7; content:"|3b|opqopq="; distance:0; fast_pattern; content:"|3b|QiHooGUID="; distance:0; content:"|3b|"; endswith; http.header_names; content:!"Accept-"; content:!"Referer"; classtype:command-and-control; sid:2032746; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_09_11, deployment Perimeter, malware_family Cobalt_Strike, confidence Medium, signature_severity Major, updated_at 2022_05_03, reviewed_at 2024_03_05, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1001, mitre_technique_name Data_Obfuscation;)