alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET DELETED Unknown - Payload Download - 9Alpha1Digit.exe"; flow:established,to_client; content:"attachment"; http_header; content:".exe"; http_header; fast_pattern:only; pcre:"/[a-z]{9}[0-9]\.exe/H"; file_data; content:"MZ"; depth:2; classtype:trojan-activity; sid:2014968; rev:8; metadata:created_at 2012_06_26, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)