alert http1 $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Backdoor.Win32/Likseput.A Checkin Windows Vista/7/8"; flow:established,to_server; http.header; content:"User-Agent|3a 20|6."; fast_pattern; http.user_agent; content:"6."; startswith; content:"|3a|"; distance:4; within:1; content:"|5c|"; distance:0; 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:8; metadata:created_at 2013_02_20, signature_severity Major, updated_at 2024_04_07;)