Suspicious OneNote Embedded File Open Warning Disabled via Registry

ATT&CK techniques

Persistence → Defense Evasion

Recon
Resource Dev
Initial Access
Execution
Persistence
- T1112Modify Registry
Priv Esc
Defense Evasion
- T1112Modify Registry
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects modification of the OneNote EmbeddedFileOpenWarningDisabled registry value to suppress the security prompt shown when opening embedded attachments. Attackers set this value so that weaponised OneNote documents execute embedded payloads without a warning, making this change a defense evasion step that enables silent user execution.

Reporting behind it

Related detections9 linkedT1112 — drag to rearrange

Malicious WDigest UseLogonCredential Cleartext Credential Enablement

Suspicious Run Key Persistence via Reg Add

Malicious Task Manager Disabling via DisableTaskMgr Policy Registry Value

Suspicious Registry Value under Console WindowsUpdates for C2 Storage

Suspicious Office VBA Object Model Access Enabled via Registry (via registry_set)

Suspicious PowerShell Payload Staging in HKCU Printers Registry Key

Suspicious Rootkit Configuration Registry Keys (via registry_set)

Suspicious Disabling of Chromium App-Bound Encryption via Policy Registry Key (via registry_set)

Windows reg.exe Registry Tampering of Internal Tool and Explorer Policy Settings (T1112)

Suspicious OneNote Embedded File Open Warning Disabled via Registry

Pivot detection · T1112 · 9 related

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

Full detection rule

Unlock this rule to view and copy it

The detection logic is included with a plan. Everything else — context, mappings and implementation details — stays free on this page.

Sign in for 3 free unlocks

Signing in gives you 3 unlocks to spend on any rule in the library. No card, and they do not expire.

Also included

Unlocked rules convert on this page — to Splunk SPL or Splunk — Raw Index SPL or Microsoft Sentinel KQL or Microsoft Sentinel ASIM ASIM KQL or Microsoft Defender XDR KQL or Elastic Security KQL or Elastic Security Lucene or Elastic Security ES|QL or CrowdStrike Falcon CQL or SentinelOne PowerQuery or Palo Alto Cortex XDR XQL or Carbon Black Cloud Platform Search or Carbon Black EDR Process Search or Google Security Operations UDM Search or IBM QRadar AQL or Sumo Logic Cloud SIEM Rules expression or Rapid7 InsightIDR LEQL or Graylog Search or OpenSearch Lucene or OpenSearch PPL PPL or Grafana Loki LogQL or SQLite SQL or Zircolite SQLite — with the log-source profile the engine picked, the field map it used, and everything it could not express. Converting a rule you have unlocked costs no further credit.

See it run on a free rule →Convert your own rule →