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Hiding User Account Via SpecialAccounts Registry Key

Detects modifications to the registry key "HKLM\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\SpecialAccounts\Userlist" where the value is set to "0" in order to hide user account from being listed on the logon screen.

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Launch
Nasreddine Bencherchali (Nextron Systems), François HubautCreated Tue Jul 12Updated Thu Jan 26f8aebc67-a56d-4ec9-9fbe-7b0e8b7b4efdwindows
Log Source
WindowsRegistry Set
ProductWindows← raw: windows
CategoryRegistry Set← raw: registry_set
Detection Logic
Detection Logic1 selector
detection:
    selection:
        TargetObject|contains: '\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\SpecialAccounts\UserList'
        Details: 'DWORD (0x00000000)'
    condition: selection
False Positives
Unknown

False positive likelihood has not been assessed. Additional context may be needed during triage.

References
1
Resolving title…
thedfirreport.com
2
Resolving title…
github.com
Testing & Validation

Simulations

atomic-red-teamT1564.002
View on ART

Create Hidden User in Registry

GUID: 173126b7-afe4-45eb-8680-fa9f6400431c

Regression Tests

by SigmaHQ Team
Positive Detection Test1 matchevtx

Microsoft-Windows-Sysmon

EVTX JSON
MITRE ATT&CK
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Hiding User Account Via SpecialAccounts Registry Key - CommandLine

Detects changes to the registry key "HKLM\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\SpecialAccounts\Userlist" where the value is set to "0" in order to hide user account from being listed on the logon screen.

Detects similar activity. Both rules may fire on overlapping events.

Rule Metadata
Rule ID
f8aebc67-a56d-4ec9-9fbe-7b0e8b7b4efd
Status
test
Level
high
Type
Detection
Created
Tue Jul 12
Modified
Thu Jan 26
Author
Nasreddine Bencherchali (Nextron Systems), François Hubaut
Path
rules/windows/registry/registry_set/registry_set_special_accounts.yml
Raw Tags
attack.defense-evasionattack.t1564.002
View on GitHub