alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE W32/Citadel Pro File.php CnC POST"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/pro/file.php"; reference:url,malwaremustdie.blogspot.co.uk/2013/04/wireshark-analysis-of-citadel-trojan.html; reference:url,seifreed.es/docs/Citadel%20Trojan%20Report_eng.pdf; classtype:command-and-control; sid:2016741; rev:3; metadata:created_at 2013_04_09, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_23;)