huntrule

Windows Registry Changes for Outlook WebView Home Page URL Persistence

Alerts on Windows registry modifications affecting Outlook WebView home page URL settings.

FreeReviewedSigma · High · v1
Product
windows
Category
registry_set
Author
Tobias Michalski (Nextron Systems), David Bertho (@dbertho) & Eirik Sveen (@0xSV1), Storebrand (SigmaHQ), DRL 1.1
Published
2021-06-09
Updated
2026-07-30
AnalysisDetection

ATT&CK techniques

Persistence → Defense Evasion

  1. Recon

  2. Resource Dev

  3. Initial Access

  4. Execution

  5. Persistence

  6. Priv Esc

  7. Defense Evasion

  8. Cred Access

  9. Discovery

  10. Lateral Movement

  11. Collection

  12. C2

  13. Exfiltration

  14. Impact

What it detects

This rule flags registry set events where the TargetObject path indicates Outlook WebView home page configuration under Microsoft Office. Attackers may abuse the Outlook home page setting to establish persistence by changing the WebView URL configuration. It relies on Windows registry write telemetry that includes the TargetObject path being written.

Reporting behind it

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Malicious WDigest UseLogonCredential Enabled for Cleartext Credential Theft (via registry_set)
Suspicious ClickFix RunMRU Entry Recording LOLBIN Command from Run Dialog
Windows Registry Changes for Outlook WebView Home Page URL Persistence
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.