alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE W32/Siscos CnC Checkin"; flow:established,to_server; http.uri; content:".php?getcmd="; fast_pattern; content:"&uid="; http.user_agent; content:"|3b 20|MSlE|20|6|2e|0|3b|"; offset:23; depth:11; classtype:command-and-control; sid:2013384; rev:4; metadata:created_at 2011_08_09, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_02_20;)