""ET TROJAN Observed Malicious SSL Cert (Cobalt Strike)""

SID: 2033993

Revision: 2

Class Type: trojan-activity

Metadata: attack_target Client_and_Server, created_at 2021_09_21, deployment Perimeter, malware_family Cobalt_Strike, performance_impact Low, signature_severity Major, tag SSL_Malicious_Cert, updated_at 2021_09_21, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol

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: "|13|systemmentorsec.com"

Within: 20

PCRE:

Special Options:

  • fast_pattern

source