Potential Persistence Via Outlook LoadMacroProviderOnBoot Setting

Severity: high
Author: Nasreddine Bencherchali (Nextron Systems)
Source: upstream

Detects the modification of Outlook setting "LoadMacroProviderOnBoot" which if enabled allows the automatic loading of any configured VBA project/module

MITRE ATT&CK coverage

Tactic	Techniques
Persistence	`T1137` Office Application Startup, `T1546` Event Triggered Execution
Privilege Escalation	`T1546` Event Triggered Execution
Command & Control	`T1008` Fallback Channels

Event coverage

Provider	Event ID	Title
Sysmon	13	RegistryEvent (Value Set)

Stages and Predicates

Stage 1: `selection`

Details|contains: 0x00000001
TargetObject|endswith: '\Outlook\LoadMacroProviderOnBoot'

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.