sigmaDRL-1.1from SigmaHQ/sigma

Winlogon AllowMultipleTSSessions Enable

Detects when the 'AllowMultipleTSSessions' value is enabled. Which allows for multiple Remote Desktop connection sessions to be opened at once. This is often used by attacker as a way to connect to an RDP session without disconnecting the other users

Quality

100

FP risk

—

Forks

Views

ATT&CK techniques

T1112

Rule sourcerules/windows/registry/registry_set/registry_set_winlogon_allow_multiple_tssessions.yml

title: Winlogon AllowMultipleTSSessions Enable
id: f7997770-92c3-4ec9-b112-774c4ef96f96
status: test
description: |
  Detects when the 'AllowMultipleTSSessions' value is enabled.
  Which allows for multiple Remote Desktop connection sessions to be opened at once.
  This is often used by attacker as a way to connect to an RDP session without disconnecting the other users
references:
    - http://blog.talosintelligence.com/2022/09/lazarus-three-rats.html
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-09-09
modified: 2023-08-17
tags:
    - attack.persistence
    - attack.defense-evasion
    - attack.t1112
logsource:
    category: registry_set
    product: windows
detection:
    selection:
        TargetObject|endswith: '\Microsoft\Windows NT\CurrentVersion\Winlogon\AllowMultipleTSSessions'
        Details|endswith: DWORD (0x00000001)
    condition: selection
falsepositives:
    - Legitimate use of the multi session functionality
level: medium