Rule History

SID: 2012607 • Source: et/open

Versions (3)

Version DetailsCurrent

Rev: 5 • Mar 31, 2011, 12:00 PM

Message:

ET USER_AGENTS Lowercase User-Agent header purporting to be MSIE

Rule:

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET USER_AGENTS Lowercase User-Agent header purporting to be MSIE"; flow:established,to_server; http.protocol; content:"HTTP/1"; startswith; http.header_names; content:"|0d 0a|user-agent|0d 0a|"; fast_pattern; http.user_agent; content:"Mozilla/4.0|20|(compatible|3b 20|MSIE|20|"; content:!"|0d 0a|VIA|3a 20|"; classtype:trojan-activity; sid:2012607; rev:5; metadata:created_at 2011_03_31, confidence High, signature_severity Informational, updated_at 2024_02_08;)

Created:

Mar 31, 2011, 12:00 PM

Updated:

Feb 8, 2024, 12:00 PM

DB Created:

Sep 21, 2024, 3:00 AM

DB Updated:

May 30, 2025, 12:04 AM

Filename:

rules/emerging-user_agents.rules