Rule History

SID: 2032926 • Source: et/open

Versions (4)

Version DetailsCurrent

Rev: 2 • May 10, 2021, 12:00 PM

Message:

ET INFO Possible Overflow Attempt - Abnormally Large SMTP EHLO Inbound

Rule:

alert tcp-pkt any any -> [$HOME_NET,$HTTP_SERVERS,$SMTP_SERVERS] any (msg:"ET INFO Possible Overflow Attempt - Abnormally Large SMTP EHLO Inbound"; flow:established,to_server; content:"EHLO"; startswith; isdataat:1000,relative; classtype:bad-unknown; sid:2032926; rev:2; metadata:attack_target SMTP_Server, created_at 2021_05_10, deployment Perimeter, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_05_11;)

Created:

May 10, 2021, 12:00 PM

Updated:

May 11, 2021, 12:00 PM

DB Created:

Sep 21, 2024, 3:00 AM

DB Updated:

Sep 11, 2025, 9:34 PM

Filename:

rules/emerging-info.rules