alert tcp $EXTERNAL_NET 1024: -> $HOME_NET any (msg:"ET MALWARE Ruskill CnC Download Command 2"; flow:established,to_client; content:"|3a|n"; depth:2; content:"on .dl http|3a|//"; distance:0; classtype:command-and-control; sid:2013330; rev:1; metadata:created_at 2011_07_27, signature_severity Major, updated_at 2019_07_26;)