Outlook Macro Execution Without Warning Setting Enabled

Severity: high
Author: @ScoubiMtl
Source: upstream

Detects the modification of Outlook security setting to allow unprompted execution of macros.

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\Security\Level'

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.