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Detection rules › Sigma

Scripted Diagnostics Turn Off Check Enabled - Registry

Status
test
Severity
medium
Log source
category registry_set, product windows
Author
Christopher Peacock @securepeacock, SCYTHE @scythe_io
Source
github.com/SigmaHQ/sigma

Detects enabling TurnOffCheck which can be used to bypass defense of MSDT Follina vulnerability

Known false positives

  • Administrator actions

MITRE ATT&CK coverage

TacticTechniques
Defense Impairment

Telemetry coverage

ProviderRecord / event type
SysmonEvent ID 13: RegistryEvent (Value Set)

Rule body

title: Scripted Diagnostics Turn Off Check Enabled - Registry
id: 7d995e63-ec83-4aa3-89d5-8a17b5c87c86
status: test
description: Detects enabling TurnOffCheck which can be used to bypass defense of MSDT Follina vulnerability
references:
    - https://twitter.com/wdormann/status/1537075968568877057?s=20&t=0lr18OAnmAGoGpma6grLUw
author: 'Christopher Peacock @securepeacock, SCYTHE @scythe_io'
date: 2022-06-15
modified: 2023-08-17
tags:
    - attack.defense-impairment
    - attack.t1685
logsource:
    product: windows
    category: registry_set
detection:
    selection:
        TargetObject|endswith: '\Policies\Microsoft\Windows\ScriptedDiagnostics\TurnOffCheck'
        Details: 'DWORD (0x00000001)'
    condition: selection
falsepositives:
    - Administrator actions
level: medium

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    TargetObject|endswith: '\Policies\Microsoft\Windows\ScriptedDiagnostics\TurnOffCheck'
    Details: 'DWORD (0x00000001)'

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
Detailseq
  • DWORD (0x00000001) corpus 40 (sigma 36, chronicle 4)
field:"Details" kind:eq value:"DWORD (0x00000001)"
TargetObjectends_with
  • \Policies\Microsoft\Windows\ScriptedDiagnostics\TurnOffCheck
field:"TargetObject" kind:ends_with value:"\Policies\Microsoft\Windows\ScriptedDiagnostics\TurnOffCheck"