- 1 year ago
How to change a Process' Privilege Level inside of a Windows File Filter Driver (minifilter driver)?
To change a process' privilege level inside a Windows File Filter Driver (Minifilter driver), you can use the ZwSetInformationProcess
function, which is a system function provided by the Windows kernel. Here's an example of how you can use it:
cpp#include <ntifs.h>
#include <ntdef.h>
EXTERN_C NTSYSAPI NTSTATUS NTAPI ZwSetInformationProcess(
_In_ HANDLE ProcessHandle,
_In_ PROCESS_INFORMATION_CLASS ProcessInformationClass,
_In_ PVOID ProcessInformation,
_In_ ULONG ProcessInformationLength
);
// Function to change the privilege level of a process
NTSTATUS ChangeProcessPrivilege(HANDLE processHandle, ULONG privilegeLevel)
{
ULONG privilegeValue = privilegeLevel; // Set the desired privilege level
return ZwSetInformationProcess(processHandle, ProcessAccessToken,
&privilegeValue, sizeof(privilegeValue));
}
In this example, the ChangeProcessPrivilege
function takes the process handle of the target process and the desired privilege level as parameters. The privilegeLevel
parameter should be set to the desired privilege level value according to the Windows documentation (e.g., SE_PRIVILEGE_ENABLED
, SE_PRIVILEGE_ENABLED_BY_DEFAULT
, etc.).
By calling ZwSetInformationProcess
with the appropriate parameters, you can change the privilege level of the target process from within your Windows File Filter Driver (Minifilter driver).
Please note that working with kernel-level drivers and changing process privilege levels is a sensitive task and should be approached with caution. Ensure that you have a thorough understanding of the implications and security considerations before implementing such functionality. Additionally, developing kernel-level drivers requires expertise and adherence to best practices.