""ET TROJAN OldGremlin/TA801 Domain in TLS SNI (1cbit .org)""

SID: 2055283

Revision: 1

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2024_08_15, deployment Perimeter, signature_severity Major, updated_at 2024_08_15, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1566, mitre_technique_name Phishing

Reference:

• Link

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 09|1cbit.org"

Within: 8

PCRE:

Special Options:

• fast_pattern

source