Rule History

SID: 2033315 • Source: et/open

Versions (5)

Version DetailsCurrent

Rev: 1 • Jul 12, 2021, 12:00 PM

Message:

ET USER_AGENTS Observed Malicious User-Agent (Brute Force Attacks)

Rule:

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET USER_AGENTS Observed Malicious User-Agent (Brute Force Attacks)"; flow:established,to_server; http.user_agent; content:"Microsoft|20|Office/14.0|20|(Windows|20|NT|20|6.1|3b 20|Microsoft|20|Outlook|20|14.0.7162|3b 20|Pro"; bsize:71; reference:url,media.defense.gov/2021/Jul/01/2002753896/-1/-1/1/CSA_GRU_GLOBAL_BRUTE_FORCE_CAMPAIGN_UOO158036-21.PDF; classtype:bad-unknown; sid:2033315; rev:1; metadata:created_at 2021_07_12, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_07_12;)

Created:

Jul 12, 2021, 12:00 PM

Updated:

Jul 12, 2021, 12:00 PM

DB Created:

Sep 21, 2024, 3:00 AM

DB Updated:

Sep 10, 2025, 9:34 PM

Filename:

rules/emerging-user_agents.rules