Potential Persistence Via Excel Add-in - Registry

Severity: high
Author: frack113
Source: upstream

Detect potential persistence via the creation of an excel add-in (XLL) file to make it run automatically when Excel is started.

MITRE ATT&CK coverage

Tactic	Techniques
Persistence	`T1137.006` Office Application Startup: Add-ins

Event coverage

Provider	Event ID	Title
Sysmon	13	RegistryEvent (Value Set)

Stages and Predicates

Stage 1: `selection`

Details|endswith: .xll
Details|startswith: '/R '
TargetObject|endswith: '\Excel\Options'
TargetObject|contains: 'Software\Microsoft\Office\'

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.