alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"ET DELETED UPS Inbound bad attachment v.4"; flow:established,to_server; content:"Content-Disposition|3a| attachment|3b|"; nocase; content:"filename=|22|UPS_AIR_CARGO_bar-coded-lot-labels-EXAMPLE.zip|22| "; nocase; within:100; classtype:trojan-activity; sid:2012442; rev:2; metadata:created_at 2011_03_09, signature_severity Unknown, updated_at 2019_07_26;)