Suspicious Logon Script Persistence via UserInitMprLogonScript
- Product
- windows
- Category
- registry_set
- Author
- HuntRule
- Published
- 2026-09-27
- Updated
- 2026-09-27
ATT&CK techniques
Persistence → Priv EscRecon
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 a value written to the UserInitMprLogonScript key which the Dark Pink APT abuses together with forfiles.exe to autorun a payload at every user logon. This environment key is almost never set legitimately so its modification is a strong persistence signal. It is important because logon script persistence survives reboots and is frequently overlooked.
Reporting behind it
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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