alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Cobalt Strike Related Activity (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; pcre:"/^[A-Za-z0-9]{4}$/"; http.user_agent; content:"FunWebProducts|3b|IE0006_ver1|3b|EN_GB"; fast_pattern; endswith; http.host; pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/"; http.header_names; content:!"Referer"; reference:url,unit42.paloaltonetworks.com/cobalt-strike-malleable-c2-profile/; classtype:trojan-activity; sid:2035546; rev:1; metadata:attack_target Client_Endpoint, created_at 2022_03_21, deployment Perimeter, malware_family Cobalt_Strike, confidence Medium, signature_severity Major, updated_at 2023_07_13, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1001, mitre_technique_name Data_Obfuscation;)