alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Trapwot FakeAV Checkin"; flow:established,to_server; http.uri; content:"v="; content:"a="; content:"u="; content:"i=0"; fast_pattern; pcre:"/^\/(?:[a-z]+\/)?[a-z_]+\?[a-z]=/"; http.request_body; pcre:"/^[\x20-\x7e\r\n]{0,20}[^\x20-\x7e\r\n]/"; http.header_names; content:!"Accept"; content:!"Referer|0d 0a|"; reference:md5,baf71ace207afd3f330c4aba3784e074; classtype:command-and-control; sid:2020646; rev:6; metadata:created_at 2015_03_09, malware_family Win32_Trapwot, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_29;)