alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Adaptix C2 Default User-Agent Observed"; flow:established,to_server; http.user_agent; content:"Mozilla/5.0|20 28|Windows NT 6.2|3b 20|rv|3a|20.0|29 20|Gecko/20121202|20|Firefox/20.0"; fast_pattern; reference:url,github.com/Adaptix-Framework/AdaptixC2/blob/a7401fa3fdbc7ae6b632c40570292f844e40ff40/Extenders/listener_beacon_http/config.json; classtype:trojan-activity; sid:2063044; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Mac_OSX, affected_product Linux, affected_product Windows_11, attack_target Client_and_Server, tls_state TLSDecrypt, created_at 2025_06_18, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Adaptix, updated_at 2025_06_18, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel; target:src_ip;)