alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"ET DELETED UPS Spam Inbound Variant 2"; flow:established,to_server; content:"Content-Disposition|3A| attachment|3b|"; nocase; content:"filename"; within:100; content:"UPS_INVOICE_NR"; within:50; pcre:"/filename=\x22UPS_INVOICE_NR\.[0-9]{4}-[0-9]{6}\.zip\x22/mi"; classtype:trojan-activity; sid:2011150; rev:3; metadata:created_at 2010_07_30, signature_severity Unknown, updated_at 2019_07_26;)