Rule History

SID: 2033157 • Source: et/open

Versions (5)

Version DetailsCurrent

Rev: 1 • Jun 22, 2021, 12:00 PM

Message:

ET JA3 Hash - Possible Cobalt Strike Server

Rule:

alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET JA3 Hash - Possible Cobalt Strike Server"; flowbits:isset,ET.cobaltstrike.ja3; ja3s.hash; content:"eb1d94daa7e0344597e756a1fb6e7054"; reference:url,thedfirreport.com/2021/06/20/from-word-to-lateral-movement-in-1-hour/; classtype:bad-unknown; sid:2033157; rev:1; metadata:created_at 2021_06_22, confidence Low, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_06_22;)

Created:

Jun 22, 2021, 12:00 PM

Updated:

Jun 22, 2021, 12:00 PM

DB Created:

Sep 21, 2024, 3:00 AM

DB Updated:

Sep 10, 2025, 9:34 PM

Filename:

rules/emerging-ja3.rules