alert tcp $HOME_NET any -> $EXTERNAL_NET 443 (msg:"ET DELETED W32/Ramnit Initial CnC Connection"; flow:established,to_server; dsize:6; content:"|00 FF FB 00 00 00|"; fast_pattern:only; reference:url,contagiodump.blogspot.com/2012/01/blackhole-ramnit-samples-and-analysis.html; classtype:command-and-control; sid:2014131; rev:3; metadata:created_at 2012_01_17, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)