alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"ET DELETED UPS Spam Inbound Variant 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:2012235; rev:3; metadata:created_at 2011_01_27, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)