Rule History

SID: 2045062 • Source: et/open

Versions (4)

Version DetailsCurrent

Rev: 1 • Apr 20, 2023, 12:00 PM

Message:

ET INFO Mailtrack .io Email Activity Tracking M1

Rule:

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Mailtrack .io Email Activity Tracking M1"; flow:established,to_server; urilen:66; http.method; content:"GET"; http.host; content:"mailtrack.io"; bsize:12; http.uri; content:"/trace/mail/"; startswith; fast_pattern; pcre:"/^(?:[a-z0-9]{40})\x2epng\x3fu\x3d(?:0-9]{7})$/R"; threshold:type limit, count 1, seconds 1800, track by_src; classtype:misc-activity; sid:2045062; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_04_20, deployment Perimeter, deployment SSLDecrypt, performance_impact Moderate, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_04_20;)

Created:

Apr 20, 2023, 12:00 PM

Updated:

Apr 20, 2023, 12:00 PM

DB Created:

Sep 21, 2024, 3:00 AM

DB Updated:

Aug 25, 2025, 9:35 PM

Filename:

rules/emerging-info.rules