Terminal Server Client Connection History Cleared - Registry — Sigma Rule

Rule metadata and linked tags

Author: Christian Burkard (Nextron Systems). Source status: test; severity: high. Source dates: 2021-10-19 / 2023-02-08.

{
  "category": "registry_delete",
  "product": "windows"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 28549501526d72168de14be7081bf3f8f0a25828e2e258dbeabbb4d345789fd1

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Terminal Server Client Connection History Cleared - Registry
id: 07bdd2f5-9c58-4f38-aec8-e101bb79ef8d
status: test
description: Detects the deletion of registry keys containing the MSTSC connection history
references:
    - https://learn.microsoft.com/en-us/troubleshoot/windows-server/remote/remove-entries-from-remote-desktop-connection-computer
    - http://woshub.com/how-to-clear-rdp-connections-history/
    - https://www.trendmicro.com/en_us/research/23/a/vice-society-ransomware-group-targets-manufacturing-companies.html
author: Christian Burkard (Nextron Systems)
date: 2021-10-19
modified: 2023-02-08
tags:
    - attack.persistence
    - attack.stealth
    - attack.defense-impairment
    - attack.t1070
    - attack.t1112
logsource:
    category: registry_delete
    product: windows
detection:
    selection1:
        EventType: DeleteValue
        TargetObject|contains: '\Microsoft\Terminal Server Client\Default\MRU'
    selection2:
        EventType: DeleteKey
        TargetObject|contains: '\Microsoft\Terminal Server Client\Servers\'
    condition: 1 of selection*
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://learn.microsoft.com/en-us/troubleshoot/windows-server/remote/remove-entries-from-remote-desktop-connection-computer
• http://woshub.com/how-to-clear-rdp-connections-history/
• https://www.trendmicro.com/en_us/research/23/a/vice-society-ransomware-group-targets-manufacturing-companies.html