alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET DELETED Zhelatin Variant Checkin"; flow:established,to_server; content:"/adload.php?a1="; nocase; http_uri; content:"a3="; nocase; http_uri; content:"&a4="; nocase; http_uri; content:"&a5="; nocase; http_uri; content:!"User-Agent|3a|"; http_header; content:"Host|3a|"; http_header; classtype:trojan-activity; sid:2003408; rev:7; metadata:created_at 2010_07_30, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)