alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Zentom FakeAV Checkin"; flow:established,to_server; http.uri; content:".php?prodclass="; fast_pattern; content:"&coid="; content:"&fff="; content:"&IP="; content:"&lct="; http.user_agent; content:"Mozilla/3.0 (compatible|3b 20|Indy Library)"; startswith; classtype:command-and-control; sid:2013785; rev:6; metadata:created_at 2011_10_20, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_13;)