alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Trapwot FakeAV Post Infection CnC Beacon"; flow:established,to_server; http.uri; content:"/rp?"; fast_pattern; content:"v="; content:"a="; content:"u="; content:"d="; pcre:"/^\/(?:[^\x2f]+\/)?rp\?[a-z]=/"; http.header_names; content:!"Accept"; content:!"Referer|0d 0a|"; reference:md5,fc962cb08f62e3d6368500a8e747cf73; classtype:command-and-control; sid:2020645; rev:4; metadata:attack_target Client_Endpoint, created_at 2015_03_09, deployment Perimeter, malware_family Win32_Trapwot, signature_severity Major, tag c2, updated_at 2020_09_29, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)