alert tcp $EXTERNAL_NET !6661:6668 -> $HOME_NET any (msg:"ET MALWARE IRC Bot Download http Command"; flow:established,from_server; content:"JOIN|20 3a|#"; nocase; content:"dl|20|http|3a 2f 2f|"; distance:0; content:"|2e|exe"; distance:0; reference:md5,fa6ae89b101a0367cc98798c7333e3a4; classtype:trojan-activity; sid:2014439; rev:5; metadata:created_at 2012_03_28, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_07_07;)