alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE General Trojan Checkin by MAC chkmac.php"; flow:established,to_server; http.method; content:"POST"; nocase; http.uri; content:"/ctrl/chkmac.php?mac="; fast_pattern; nocase; classtype:command-and-control; sid:2006403; rev:7; metadata:created_at 2010_07_30, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_17;)