Rule History

SID: 2030367 • Source: et/open

Versions (4)

Version DetailsCurrent

Rev: 1 • Jun 19, 2020, 12:00 PM

Message:

ET JA3 Hash - Possible POSHC2 Server Response

Rule:

alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET JA3 Hash - Possible POSHC2 Server Response"; flowbits:isset,ET.poshc2.powershellclient; ja3s.hash; content:"ec74a5c51106f0419184d0dd08fb05bc"; reference:url,labs.nettitude.com/blog/detecting-poshc2-indicators-of-compromise/; classtype:unknown; sid:2030367; rev:1; metadata:attack_target Client_Endpoint, created_at 2020_06_19, deployment Perimeter, malware_family PoshC2, performance_impact Low, confidence Low, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_06_19;)

Created:

Jun 19, 2020, 12:00 PM

Updated:

Jun 19, 2020, 12:00 PM

DB Created:

Jun 19, 2020, 12:00 PM

DB Updated:

Sep 17, 2025, 9:34 PM

Filename:

rules/emerging-ja3.rules