""ET TROJAN Observed Malicious SSL Cert (CobaltStrike CnC)""

SID: 2033951

Revision: 1

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2021_09_15, deployment Perimeter, malware_family Cobalt_Strike, signature_severity Major, updated_at 2021_09_15, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1001, mitre_technique_name Data_Obfuscation

Reference:

Protocol: tcp

Source Network: $EXTERNAL_NET

Source Port: 443

Destination Network: $HOME_NET

Destination Port: any

Flow: established,to_client

Contents:

  • Value: "|16|"

  • Value: "|0b|"

  • Value: "|06 03 55 04 03|"

  • Value: "|18|netfoundationmtgcorp.com"

Within: 25

PCRE:

Special Options:

  • nocase

source