alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Trats.a Post-Infection Checkin"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"AID="; content:"GUID="; nocase; http.user_agent; bsize:47; content:"Mozilla|2f|4|2e|0|20 28|compatible|7c|3b|7c 20|MSIE|20|6|2e|0|29 20|WinNT|20|5|2e|1"; http.header_names; content:"|0d 0a|SPK|0d 0a|"; fast_pattern; classtype:command-and-control; sid:2008155; rev:5; metadata:created_at 2010_07_30, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_02_06;)