Malicious Hidden Local Account via Winlogon SpecialAccounts UserList
- Product
- windows
- Category
- registry_set
- Author
- HuntRule
- Published
- 2026-07-05
- Updated
- 2026-08-28
ATT&CK techniques
Persistence → Defense EvasionRecon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact
What it detects
This rule detects modification of the Winlogon SpecialAccounts UserList registry key which hides a local account from the Windows logon screen, a defense-evasion technique used alongside AnyDesk abuse to conceal an attacker-created administrator account. Writing to this key is almost never legitimate and indicates deliberate account hiding.
Reporting behind it
- nccgroup.comhttps://www.nccgroup.com/research/the-dark-side-how-threat-actors-leverage-anydesk-for-malicious-activities/
- attack.mitre.orghttps://attack.mitre.org/techniques/T1564/002/
- attack.mitre.orghttps://attack.mitre.org/techniques/T1136/001/
- sophos.comhttps://www.sophos.com/en-us/blog/akira-again-the-ransomware-that-keeps-on-taking
- bitdefender.comhttps://www.bitdefender.com/en-us/blog/businessinsights/deep-dive-into-unfading-sea-haze-a-new-threat-actor-in-the-south-china-sea
Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.
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