alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE FakeAV FakeSmoke HTTP POST check-in"; flow:established,to_server; http.method; content:"POST"; nocase; http.header_names; content:!"User-Agent|0d 0a|"; nocase; content:!"Referer|0d 0a|"; nocase; http.request_body; content:"current_version="; pcre:"/^[a-z0-9]{196}/Ri"; reference:url,isc.sans.org/diary.html?storyid=7768; classtype:trojan-activity; sid:2010512; rev:10; metadata:created_at 2010_07_30, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_24;)