Rule History

alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Dropper.Win32.Npkon Client Checkin"; flow:established,to_server; content:"|40 1f|"; offset:1; depth:2; content:"|03|"; distance:1; within:1; content:"|20 00 00 00|"; distance:1; within:4; dsize:10; reference:md5,a7f4a7d08fa650a5f09a00519b944b0b; classtype:command-and-control; sid:2013793; rev:1; metadata:created_at 2011_10_24, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)