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

SID: 2033392

Revision: 1

Class Type: attempted-admin

Metadata: attack_target Client_Endpoint, created_at 2021_07_23, deployment Perimeter, malware_family Cobalt_Strike, signature_severity Major, updated_at 2021_07_23, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1001, mitre_technique_name Data_Obfuscation

Reference:

  • md5

  • 2232b445760712242a0e5ea456fcc700

Protocol: tcp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: 443

Flow: established,to_server

Contents:

  • Value: "|16|" Depth: 1

  • Value: "|01|"

  • Value: "|00 00 0b|krinsop.com"

Within:

PCRE:

Special Options:

source