T1137.004SubTechniquepersistenceagent-callable

T1137.004Outlook Home Page

Sub-technique of T1137

Platforms: Windows · Office 365

ATT&CK version: 14.1

What it is

Adversaries may abuse Microsoft Outlook's Home Page feature to obtain persistence on a compromised system. Outlook Home Page is a legacy feature used to customize the presentation of Outlook folders. This feature allows for an internal or external URL to be loaded and presented whenever a folder is opened. A malicious HTML page can be crafted that will execute code when loaded by Outlook Home Page.(Citation: SensePost Outlook Home Page) Once malicious home pages have been added to the user’s mailbox, they will be loaded when Outlook is started. Malicious Home Pages will execute when the right Outlook folder is loaded/reloaded.(Citation: SensePost Outlook Home Page)

ATT&CK tactics· 1

Persistence

References

  1. https://attack.mitre.org/techniques/T1137/004
  2. https://sensepost.com/blog/2017/outlook-home-page-another-ruler-vector/
  3. https://docs.microsoft.com/en-us/office365/securitycompliance/detect-and-remediate-outlook-rules-forms-attack
  4. https://github.com/sensepost/notruler
Sourced from MITRE ATT&CK Enterprise v14.1. Curated and contextualized for EU compliance use cases by Adam Lundqvist, Founder at SQUR.