Sigma rule: Winlogon AllowMultipleTSSessions Enable

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-b5b72760030d, updated 2023-08-17T00:00:00.000Z.

Rule

Title
Winlogon AllowMultipleTSSessions Enable
Status
test
Level
medium
Author
Nasreddine Bencherchali (Nextron Systems)
Date
2022-09-09
Modified
2023-08-17
File
rules/windows/registry/registry_set/registry_set_winlogon_allow_multiple_tssessions.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

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

Log source

product
windows
category
registry_set

Detection

selection:
    TargetObject|endswith: '\Microsoft\Windows NT\CurrentVersion\Winlogon\AllowMultipleTSSessions'
    Details|endswith: DWORD (0x00000001)
condition: selection

False positives (as the rule lists them)

  • Legitimate use of the multi session functionality

Tags

  • attack.persistence
  • attack.defense-impairment
  • attack.t1112

MITRE ATT&CK ids this rule names

References

  • http://blog.talosintelligence.com/2022/09/lazarus-three-rats.html

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/registry/registry_set/registry_set_winlogon_allow_multiple_tssessions.yml

Sources and licences

  • SigmaHQ

    "Winlogon AllowMultipleTSSessions Enable" by Nasreddine Bencherchali (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/registry/registry_set/registry_set_winlogon_allow_multiple_tssessions.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: Winlogon AllowMultipleTSSessions Enable",
entity page, dataset version ref-b5b72760030d, updated 2023-08-17T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/f7997770-92c3-4ec9-b112-774c4ef96f96 (accessed 2026-11-03).
Underlying source: SigmaHQ rule f7997770-92c3-4ec9-b112-774c4ef96f96, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.