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InformationalSplunk security contentMichael Haag +1

Windows InProcServer32 New Outlook Form

The following analytic detects the creation or modification of registry keys associated with new Outlook form installations, potentially indicating exploitation of CVE-2024-21378. It leverages data from the…

Description

The following analytic detects the creation or modification of registry keys associated with new Outlook form installations, potentially indicating exploitation of CVE-2024-21378. It leverages data from the Endpoint.Registry datamodel, focusing on registry paths involving InProcServer32 keys linked to Outlook forms. This activity is significant as it may signify an attempt to achieve authenticated remote code execution via malicious form objects. If confirmed malicious, this could allow an attacker to create arbitrary files and registry keys, leading to remote code execution and potential full system compromise.

Detection logic

Detection requirements

Platform
Identity ProviderLinuxmacOSOffice SuiteSaaSWindows

The rule states no platform. This is derived from the 2 ATT&CK techniques it maps to.

Log source category
sysmon_eventid_13

Known benign triggers

  • False positives are possible if the organization adds new forms to Outlook via an automated method. Filter by name or path to reduce false positives.

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