alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"ET MALWARE DHL Spam Inbound"; flow:established,to_server; content:"name=|22|DHL"; nocase; content:".zip|22|"; within:68; nocase; pcre:"/name=\x22DHL(\s|_|\-)?[a-z0-9\-_\.\s]{0,63}\.zip\x22/i"; classtype:trojan-activity; sid:2010148; rev:13; metadata:created_at 2010_07_30, signature_severity Major, updated_at 2019_07_26;)