alert tcp $EXTERNAL_NET 1024: -> $HOME_NET any (msg:"ET MALWARE Ruskill CnC Download Command 1"; flow:established,to_client; content:"|3a|["; depth:2; content:".r.getfile http|3a|//"; distance:0; classtype:command-and-control; sid:2013329; rev:3; metadata:created_at 2011_07_27, signature_severity Major, updated_at 2019_07_26;)