alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET DELETED Win32/TrojanDropper.Agent Checkin"; flow:established,to_server; content:".gif?aid="; http_uri; content:"&lc="; http_uri; content:"&time="; http_uri; content:"&flag="; http_uri; content:"&domain="; http_uri; classtype:trojan-activity; sid:2013402; rev:3; metadata:created_at 2011_08_11, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)