alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Backdoor.Win32.Ixeshe"; flow:established,to_server; http.user_agent; content:"User-Agent|3a 20|"; startswith; nocase; http.uri; content:"/ym/Attachments?YY="; nocase; fast_pattern; reference:url,blog.spiderlabs.com/2012/03/dirty-rat.html; classtype:trojan-activity; sid:2014410; rev:8; metadata:created_at 2012_03_22, signature_severity Major, updated_at 2024_03_12;)