alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Possible ClickFraud Trojan Socks5 Connection"; flow:to_server,established; content:"socks5init|3a|"; depth:11; threshold:type limit,track by_src, count 1, seconds 300; flowbits:set,ET.2018855; reference:md5,2a0e042fdb2d85c2abf8bd35499ee1aa; reference:md5,c4d3db0eadc650372225d0093cd442ba; reference:md5,4c1f7c4f6d00869a6fca9fdcbadc9633; classtype:trojan-activity; sid:2018855; rev:2; metadata:created_at 2014_07_30, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)