alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Backdoor.Win32/Likseput.A Checkin Windows Vista/7/8"; flow:to_server,established; http.header; content:"|5c|"; within:64; content:"Host|3a 20|"; distance:0; content:!"|0d 0a|"; distance:-6; within:2; http.user_agent; content:"6."; depth:2; pcre:"/^6\.[0-2]\x20\d\d\x3a\d\d\x20/i"; reference:md5,b5e9ce72771217680efaeecfafe3da3f; reference:md5,4b6f5e62d7913fc1ab6c71b5b909ecbf; classtype:command-and-control; sid:2016433; rev:5; metadata:created_at 2013_02_20, signature_severity Major, updated_at 2020_10_14;)