Sigma rule: Denied Access To Remote Desktop

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-b218b8784496, updated 2021-11-27T00:00:00.000Z.

Rule

Title: Denied Access To Remote Desktop
Status: test
Level: medium
Author: Pushkarev Dmitry
Date: 2020-06-27
Modified: 2021-11-27
File: rules/windows/builtin/security/win_security_not_allowed_rdp_access.yml
Commit: ccbb0369507f796db0b0ae6854c8a2be471b9d84

This event is generated when an authenticated user who is not allowed to log on remotely attempts to connect to this computer through Remote Desktop.
Often, this event can be generated by attackers when searching for available windows servers in the network.

Log source

product: windows
service: security

Detection

selection:
    EventID: 4825
condition: selection

False positives (as the rule lists them)

Valid user was not added to RDP group

MITRE ATT&CK ids this rule names

T1021.001

References

https://www.ultimatewindowssecurity.com/securitylog/encyclopedia/event.aspx?eventid=4825

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/builtin/security/win_security_not_allowed_rdp_access.yml

Sources and licences

SigmaHQ
"Denied Access To Remote Desktop" by Pushkarev Dmitry (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/builtin/security/win_security_not_allowed_rdp_access.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: Denied Access To Remote Desktop",
entity page, dataset version ref-b218b8784496, updated 2021-11-27T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/8e5c03fa-b7f0-11ea-b242-07e0576828d9 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 8e5c03fa-b7f0-11ea-b242-07e0576828d9, 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.