alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Cobalt Strike CnC Activity (GET)"; flow:established,to_server; urilen:5; http.method; content:"GET"; http.user_agent; content:"Mozilla|2f|5|2e|0|20 28|compatible|3b 20|MSIE|20|10|2e|0|3b 20|Windows|20|NT|20|6|2e|2|3b 20|WOW64|3b 20|Trident|2f|6|2e|0|3b 20|MALNJS|29|"; fast_pattern; http.connection; content:"Keep-Alive"; http.header_names; content:!"|0d 0a|Referer|0d 0a|"; nocase; classtype:trojan-activity; sid:2052312; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2024_04_30, deployment Perimeter, malware_family Cobalt_Strike, confidence High, signature_severity Major, updated_at 2024_04_30, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1001, mitre_technique_name Data_Obfuscation;)