Malicious NotDoor Outlook Macro Auto-Execution Enablement via Registry (via registry_set)

ATT&CK techniques

Persistence → Defense Evasion

Recon
Resource Dev
Initial Access
Execution
Persistence
- T1112Modify Registry
- T1137Office Application Startup
Priv Esc
Defense Evasion
- T1112Modify Registry
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects registry modifications that make Outlook load a macro provider on boot and lower Outlook macro security, a persistence and defense evasion technique used by the NotDoor backdoor. Legitimate software rarely enables LoadMacroProviderOnBoot together with a relaxed macro security level.

Reporting behind it

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Malicious NotDoor Outlook Macro Auto-Execution Enablement via Registry (via registry_set)

Pivot detection · T1112 · 9 related

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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