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Medium>Splunk security content

Windows Outlook Macro Security Modified

The following analytic detects the modification of the Windows Registry key "Level" under Outlook Security. This allows macros to execute without warning, which could allow malicious scripts to run without notice. This detection leverages data from the Endpoint.Registry datamodel, specifically looking for the registry value name "Level" with a value of "0x00000001". This activity is significant as it is commonly associated with some malware infections, indicating potential malicious intent to harvest email information.

ATT&CK coverage

Persistence

T1137Office Application Startup 18 detections cover this technique

Command and Control

T1008Fallback Channels 5 detections cover this technique

Detection requirements

Log source category: sysmon_eventid_13

Detection logic

Published to signed-in readers

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Provenance

Where this detection came from, and what you may do with it.

At source: Open at source
Written by: Raven Tait
Splunk
Licence: Apache-2.0Read the licence
Published: Aug 26, 2026
Version: 1