alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"ET CURRENT_EVENTS Post Express Spam Inbound"; flow:established,to_server; content:"name=|22|Post_Express_Label_"; nocase; content:".zip|22|"; within:15; nocase; pcre:"/name=\x22Post_Express_Label_[a-z0-9\-_\.\s]{0,10}\.zip\x22/i"; classtype:trojan-activity; sid:2014829; rev:1; metadata:created_at 2012_05_30, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)