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ac

open source anti cheat (lol) which I made for fun.

features

  • Attached thread detection
  • Process module .text section integrity checks
  • NMI stackwalking via isr iretq
  • APC stackwalking via RtlCaptureStackBackTrace
  • DPC stackwalking via RtlCaptureStackBackTrace
  • Handle stripping via obj callbacks
  • Process handle table enumeration
  • System module device object verification
  • System module .text integrity checks
  • Unlinked process detection
  • Removed thread PspCidTable entry detection
  • Dispatch routine validation
  • Extraction of hardware identifiers
  • EPT hook detection
  • Driver integrity checks both locally and over server
  • Hypervisor detection
  • HalDispatch and HalPrivateDispatch routine validation
  • Dynamic import resolving

planned features

  • Heartbeat
  • optimise stuff
  • ntoskrnl integrity checks
  • spoofed stack identifier
  • process module inline hook detection (this would include checking whether the hook is valid, as many legimate programs hook user mode modules such as discord, nvidia overlay etc.)
  • cr3 protection
  • string, packet and other encryption
  • tpm ek extraction
  • tpm spoofer detection
  • pcileech firmware detection
  • testing program to test the features
  • simple user mode logger + usermode logging overhaul
  • data ptr detction (+ chained data ptr walking)
  • lots more which I cant think of

example

  • I have recorded an example of the program running with CS2. Note that vac was obviously disabled. If you decide to test with a steam game do not forget to launch in insecure mode
  • Shown are the kernel VERBOSE level logs in DebugView along with the usermode application console and some additional performance benchmarking things.
  • (You can find the video here)[https://youtu.be/b3mH7w8pOxs]

known issues

windows versions tested:

  • Win10 22H2
  • Win11 22H2

how to build

Requires Visual Studio and the WDK for compilation.

test signing mode

Before we continue, ensure you enable test signing mode as this driver is not signed.

  1. Open a command prompt as Administrator
  2. Enter the following commands:
bcdedit -set TESTSIGNING on
bcdedit /debug on
  1. Restart Windows

building and running the project

  1. Clone the project i.e git clone git@github.com:donnaskiez/ac.git
  2. Open the project in visual studio
  3. Select Release - No Server - Win10 or Release - No Server - Win11 depending on the version of Windows you will be running the driver on.
  4. Build the project in visual studio, if you experience any build issues - check the drivers project settings are the following:
    • Inf2Cat -> General -> Use Local Time to Yes
    • C/C++ -> Treat Warnings As Errors to No
    • C/C++ -> Spectre Mitigation to Disabled
  5. Move the driver.sys file located in ac\x64\Release - No Server\ into the Windows\System32\Drivers directory
    • You can rename the driver if you would like
  6. Use the OSR Loader and select driver.sys (or whatever you named it) that you moved to the Windows drivers folder. DO NOT REGISTER THE SERVICE YET.
  7. Under Service Start select System. This is VERY important!
  8. Click Register Service. Do NOT click Start Service!
  9. Restart Windows.
  10. Once restarted, open the program you would like to protect. This could be anything i.e cs2, notepad etc.
    • if you do use a game to test, ensure the games anti-cheat is turned off before testing
  11. Open your dll injector of choice (I simply use Process Hacker)
  12. Inject the dll found in ac\x64\Release - No Server\ named user.dll into the target program

Logs will be printed to both the terminal output and the kernel debugger. See below for configuring kernel debugger output.

Note: The server is not needed for the program to function properly.

how to configure kernel debugging output

The kernel driver is setup to log at 4 distinct levels:

#define LOG_ERROR_LEVEL  
#define LOG_WARNING_LEVEL
#define LOG_INFO_LEVEL   
#define LOG_VERBOSE_LEVEL

As the names suggest, ERROR_LEVEL is for errors, WARNING_LEVEL is for warnings. INFO_LEVEL is for general information regarding what requests the driver is processing and VERBOSE_LEVEL contains very detailed information for each request.

creating the registry key

If you are unfamiliar with the kernel debugging mask, you probably need to set one up. If you already have a debugging mask setup, you can skip to setting the mask below.

  1. Open the Registry Editor
  2. Copy and pase Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager into the bar at the top and press enter
  3. On the left hand side, right click Session Manager and select New -> Key
  4. Name the key Debug Print Filter
  5. On the left hand side you should now see Debug Print Filter, right click and select New -> DWORD (32 bit) Value
  6. Name the key DEFAULT

setting the mask

  1. Within the Debug Print Filter registry, double click the key named DEFAULT
  2. Determine the level(s) of logging you would like to see. For most people interested I would set either INFO_LEVEL or VERBOSE_LEVEL. Remember that if you set INFO_LEVEL, you will see all INFO_LEVEL, WARNING_LEVEL and ERROR_LEVEL logs. Ie you see all logs above and including your set level.
ERROR_LEVEL    = 0x3
WARNING_LEVEL  = 0x7
INFO_LEVEL     = 0xf
VERBOSE_LEVEL  = 0x1f
  1. Enter the value for the given logging level (seen above)
  2. Click Ok and restart Windows.

filtering debug output

If you choose to use INFO_LEVEL or VERBOSE_LEVEL there may be many logs from the kernel so we want to filter them out.

windbg

With WinDbg connected to the target:

  1. Pause the target using the Break button
  2. Use the command: .ofilter donna-ac*

debugview

  1. Click Edit -> Filter/Highlight
  2. Set the Include string to donna-ac*

contact

feel free to dm me on discord or uc @donnaskiez