alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Cobalt Strike Related Activity (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".js"; endswith; http.cookie; content:"Version=defaultSession-Id="; startswith; fast_pattern; pcre:"/^[a-zA-Z0-9-_]{171}$/R"; http.user_agent; content:!"Android"; content:!"Linux"; http.header_names; content:!"Referer|0d 0a|"; reference:md5,199369f6b6eba1147d7e1bca208d6dab; classtype:trojan-activity; sid:2035915; rev:2; metadata:attack_target Client_Endpoint, created_at 2022_04_13, deployment Perimeter, malware_family Cobalt_Strike, confidence Medium, signature_severity Major, updated_at 2023_03_16, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1001, mitre_technique_name Data_Obfuscation;)