| ID | Name |
|---|---|
| T1137.001 | Office Template Macros |
| T1137.002 | Office Test |
| T1137.003 | Outlook Forms |
| T1137.004 | Outlook Home Page |
| T1137.005 | Outlook Rules |
| T1137.006 | Add-ins |
Adversaries may abuse the Microsoft Office "Office Test" Registry key to obtain persistence on a compromised system. An Office Test Registry location exists that allows a user to specify an arbitrary DLL that will be executed every time an Office application is started. This Registry key is thought to be used by Microsoft to load DLLs for testing and debugging purposes while developing Office applications. This Registry key is not created by default during an Office installation.[1][2]
There exist user and global Registry keys for the Office Test feature, such as:
HKEY_CURRENT_USER\Software\Microsoft\Office test\Special\PerfHKEY_LOCAL_MACHINE\Software\Microsoft\Office test\Special\PerfAdversaries may add this Registry key and specify a malicious DLL that will be executed whenever an Office application, such as Word or Excel, is started.
| ID | Name | Description |
|---|---|---|
| G0007 | APT28 |
APT28 has used the Office Test persistence mechanism within Microsoft Office by adding the Registry key |
| ID | Mitigation | Description |
|---|---|---|
| M1040 | Behavior Prevention on Endpoint |
On Windows 10, enable Attack Surface Reduction (ASR) rules to prevent Office applications from creating child processes and from writing potentially malicious executable content to disk. [3] |
| M1054 | Software Configuration |
Create the Registry key used to execute it and set the permissions to "Read Control" to prevent easy access to the key without administrator permissions or requiring Privilege Escalation.[2] |
| ID | Data Source | Data Component | Detects |
|---|---|---|---|
| DS0017 | Command | Command Execution |
Monitor executed commands and arguments that may abuse the Microsoft Office "Office Test" Registry key to obtain persistence on a compromised system. |
| DS0022 | File | File Creation |
Monitor for newly constructed files that may abuse the Microsoft Office "Office Test" Registry key to obtain persistence on a compromised system. |
| File Modification |
Monitor for changes made to files that may abuse the Microsoft Office "Office Test" Registry key to obtain persistence on a compromised system. |
||
| DS0011 | Module | Module Load |
Monitor DLL/PE file events, specifically creation of these binary files as well as the loading of DLLs into processes. Look for DLLs that are not recognized or not normally loaded into a process. |
| DS0009 | Process | Process Creation |
Monitor newly executed processes that may abuse the Microsoft Office "Office Test" Registry key to obtain persistence on a compromised system. |
| DS0024 | Windows Registry | Windows Registry Key Creation |
Monitor for the creation of the Office Test Registry key. Collect events related to Registry key creation for keys that could be used for Office-based persistence. Since v13.52, Autoruns can detect tasks set up using the Office Test Registry key.[2] |
| Windows Registry Key Modification |
Monitor for changes made to the Office Test Registry key. Collect events related to Registry key modification for keys that could be used for Office-based persistence. Since v13.52, Autoruns can detect tasks set up using the Office Test Registry key.[2] |