alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"ET MALWARE UPS Inbound bad attachment v.5"; flow:established,to_server; content:"Content-Disposition|3a| attachment|3b|"; nocase; content:"filename=|22|UPS"; nocase; content:".zip|22|"; nocase; pcre:"/ups(_parcel_delivery-tracking-notice-|-Delivery-Notification-Message_)\S*\.zip/Ui"; classtype:trojan-activity; sid:2012443; rev:2; metadata:created_at 2011_03_09, signature_severity Major, updated_at 2019_07_26;)