Rule History

SID: 2030456 • Source: et/open

Versions (4)

Version DetailsCurrent

Rev: 1 • Jul 3, 2020, 12:00 PM

Message:

ET MALWARE Observed CobaltStrike CnC Domain in TLS SNI

Rule:

alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed CobaltStrike CnC Domain in TLS SNI"; flow:to_server,established; tls.sni; content:"advancedanalysis.be"; bsize:19; endswith; classtype:domain-c2; sid:2030456; rev:1; metadata:created_at 2020_07_03, deployment Perimeter, malware_family Cobalt_Strike, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_07_03, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)

Created:

Jul 3, 2020, 12:00 PM

Updated:

Jul 3, 2020, 12:00 PM

DB Created:

Sep 21, 2024, 3:00 AM

DB Updated:

Sep 17, 2025, 9:34 PM

Filename:

rules/emerging-malware.rules