alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"ET MALWARE USPS SPAM Inbound possible spyeye trojan"; flow:established,to_server; content:"Content-Disposition|3A| attachment|3b|"; nocase; content:"filename=|22|USPS_"; nocase; content:".zip|22|"; nocase; reference:url,www.virustotal.com/file-scan/report.html?id=ed1766eb13cc7f41243dd722baab9973560c999c1489763c0704debebe8f4cb1-1298551066; classtype:trojan-activity; sid:2012388; rev:2; metadata:created_at 2011_02_27, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)