""ET TROJAN Observed CobaltStrike CnC Domain (defendersecyrity .com in TLS SNI)""

SID: 2033061

Revision: 2

Class Type: trojan-activity

Metadata: affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_06_01, deployment Perimeter, malware_family Cobalt_Strike, signature_severity Major, updated_at 2021_06_01

Reference:

Protocol: tcp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: 443

Flow: established,to_server

Contents:

  • Value: "|16|"

  • Value: "|01|"

  • Value: "|00 00 14|defendersecyrity.com"

Within: 8

PCRE:

Special Options:

  • fast_pattern

source