Rule History

SID: 2029750 • Source: et/open

Versions (4)

Version DetailsCurrent

Rev: 2 • Mar 27, 2020, 12:00 PM

Message:

ET USER_AGENTS Suspicious User Agent (KtulhuBrowser)

Rule:

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET USER_AGENTS Suspicious User Agent (KtulhuBrowser)"; flow:established,to_server; http.user_agent; bsize:13; content:"KtulhuBrowser"; nocase; classtype:bad-unknown; sid:2029750; rev:2; metadata:attack_target Client_Endpoint, created_at 2020_03_27, deployment Perimeter, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_19;)

Created:

Mar 27, 2020, 12:00 PM

Updated:

Aug 19, 2020, 12:00 PM

DB Created:

Sep 21, 2024, 3:00 AM

DB Updated:

Sep 19, 2025, 10:35 PM

Filename:

rules/emerging-user_agents.rules