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Rev: 5 • Oct 24, 2016, 12:00 PMET HUNTING Suspicious Empty SSL Certificate - Observed in Cobalt Strike
alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET HUNTING Suspicious Empty SSL Certificate - Observed in Cobalt Strike"; flow:from_server,established; tls.cert_subject; content:"C=, ST=, L=, O=, OU=, CN="; endswith; bsize:25; fast_pattern; classtype:targeted-activity; sid:2023629; rev:5; metadata:affected_product Any, attack_target Client_Endpoint, created_at 2016_10_24, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Major, updated_at 2022_03_24;)
Oct 24, 2016, 12:00 PM
Mar 24, 2022, 12:00 PM
Sep 21, 2024, 3:00 AM
May 30, 2025, 12:04 AM
rules/emerging-hunting.rules