alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE KeyBoy Backdoor Login"; flow:to_server,established; content:"|c4 4c 87 3f 11 1e c4 1a|"; depth:8; reference:url,community.rapid7.com/community/infosec/blog/2013/06/07/keyboy-targeted-attacks-against-vietnam-and-india; classtype:trojan-activity; sid:2016986; rev:2; metadata:created_at 2013_06_08, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)