Rule History

SID: 2033960 • Source: et/open

Versions (4)

Version DetailsCurrent

Rev: 3 • Sep 16, 2021, 12:00 PM

Message:

ET HUNTING [@Silv0123] Possible Fake Microsoft Office User-Agent Observed

Rule:

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET HUNTING [@Silv0123] Possible Fake Microsoft Office User-Agent Observed"; flow:established,to_server; http.user_agent; content:"Microsoft Office"; startswith; fast_pattern; pcre:"/^[^\x3b\x2f\x28]+$/R"; content:!"2014"; endswith; content:!"Discovery"; endswith; content:!"OneNote"; endswith; reference:url,twitter.com/silv0123/status/1437869745961832455; classtype:bad-unknown; sid:2033960; rev:3; metadata:created_at 2021_09_16, confidence Medium, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_10_25;)

Created:

Sep 16, 2021, 12:00 PM

Updated:

Oct 25, 2021, 12:00 PM

DB Created:

Sep 21, 2024, 3:00 AM

DB Updated:

Sep 8, 2025, 9:34 PM

Filename:

rules/emerging-hunting.rules