Rule History

SID: 2044539 • Source: et/open

Versions (4)

Version DetailsCurrent

Rev: 1 • Mar 9, 2023, 12:00 PM

Message:

ET HUNTING robots Request Returning Base64 (Inbound)

Rule:

alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET HUNTING robots Request Returning Base64 (Inbound)"; flow:established,to_client; flowbits:isset,ET.robots; http.stat_code; content:"200"; fast_pattern; file.data; pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/"; classtype:bad-unknown; sid:2044539; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_03_09, deployment Perimeter, performance_impact Significant, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_03_09; target:dest_ip;)

Created:

Mar 9, 2023, 12:00 PM

Updated:

Mar 9, 2023, 12:00 PM

DB Created:

Sep 21, 2024, 3:00 AM

DB Updated:

Aug 25, 2025, 9:35 PM

Filename:

rules/emerging-hunting.rules