Rule History

SID: 2008563 • Source: et/open

Versions (5)

Version DetailsCurrent

Rev: 3 • Jul 30, 2010, 12:00 PM

Message:

ET HUNTING Suspicious SMTP handshake reply

Rule:

alert tcp $EXTERNAL_NET 25 -> $HOME_NET any (msg:"ET HUNTING Suspicious SMTP handshake reply"; flow:established,from_server; content:"701 IMHERE"; depth:10; classtype:unknown; sid:2008563; rev:3; metadata:created_at 2010_07_30, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)

Created:

Jul 30, 2010, 12:00 PM

Updated:

Jul 26, 2019, 12:00 PM

DB Created:

Sep 21, 2024, 3:00 AM

DB Updated:

Oct 13, 2025, 9:34 PM

Filename:

rules/emerging-hunting.rules