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It was suggested to check the permissions of the **RpcEptMapper** service using the **regedit GUI**, specifically the **Advanced Security Settings** window's **Effective Permissions** tab. This approach enables the assessment of granted permissions to specific users or groups without the need to examine each Access Control Entry (ACE) individually.
A screenshot showed the permissions assigned to a low-privileged user, among which the **Create Subkey** permission was notable. This permission, also referred to as **AppendData/AddSubdirectory**, corresponds with the script's findings.
The inability to modify certain values directly, yet the capability to create new subkeys, was noted. An example highlighted was an attempt to alter the **ImagePath** value, which resulted in an access denied message.
Despite these limitations, a potential for privilege escalation was identified through the possibility of leveraging the **Performance** subkey within the **RpcEptMapper** service's registry structure, a subkey not present by default. This could enable DLL registration and performance monitoring.
Documentation on the **Performance** subkey and its utilization for performance monitoring was consulted, leading to the development of a proof-of-concept DLL. This DLL, demonstrating the implementation of **OpenPerfData**, **CollectPerfData**, and **ClosePerfData** functions, was tested via **rundll32**, confirming its operational success.
The goal was to coerce the **RPC Endpoint Mapper service** into loading the crafted Performance DLL. Observations revealed that executing WMI class queries related to Performance Data via PowerShell resulted in the creation of a log file, enabling the execution of arbitrary code under the **LOCAL SYSTEM** context, thus granting elevated privileges.
The persistence and potential implications of this vulnerability were underscored, highlighting its relevance for post-exploitation strategies, lateral movement, and evasion of antivirus/EDR systems.
Although the vulnerability was initially disclosed unintentionally through the script, it was emphasized that its exploitation is constrained to outdated Windows versions (e.g., **Windows 7 / Server 2008 R2**) and requires local access.
<summary><strong>Learn AWS hacking from zero to hero with</strong><ahref="https://training.hacktricks.xyz/courses/arte"><strong>htARTE (HackTricks AWS Red Team Expert)</strong></a><strong>!</strong></summary>
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* Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family)
* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@carlospolopm**](https://twitter.com/hacktricks_live)**.**
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