Thursday Oct 06, 2022

SOLVED: Suggestions For Fixing Windows Interception Syscalls

Over the past week, some users have encountered an error code when intercepting Windows system calls. This issue can occur for a number of reasons. Let’s discuss this now. Windows system sounds are used to support file system management, process management, communication between processes, memory management, I/O control of musical instruments, security, etc. Programs work with the Windows operating system, which has system calls.


  • Summary

  • Presentation

  • ptrace(2)


  • Architecture

  • Windows implementation

  • Internal work

  • What triggers a system call?

    First, the customer application sets up a debate for the system call. After all the arguments have been set, the program will often run a “system call” instruction. This instruction throws an exception: a single event that causes the processor to move to a new address and start executing code there.

    Possibilities and limitations

  • How does wine intercept system calls?

    Wine is similar to system calls, or more specifically, Windows APIs. This is the real Wine, a Windows API emulator. Some Windows API functions are often implemented by calling a comparable Linux API function (system call), but on the other hand, most of them are much more complicated.

    Optimizations and improvements

  • Proof of concept

  • Abstract

    How system calls are intercepted?

    Systemtap can optionally intercept a number of system calls thanks to a generic plugin. Systemtap is not C, but an important language in its own right. In base mode, systemtap should normallykeep you from doing stupid things, but it certainly works in “expert mode” too, allowing the developer to use C when the need arises.

    This article introduces readers to a method they can use to
    Get a generic system call interceptor on WOW64
    [1] taken from user mode.

    In the following sections, we will quickly introduce the reader to
    System calls, motivation for this particular article, working with Ptrace(2) on Linux
    The system refers to the interception because WOW64 uses the Windows system names and
    after all, the easiest way to use this plane is to intercept
    They knew every system call and gave third party packages the ability to parse and/or
    modify system calls you created by the process.

    In addition, we will discuss possible innovations, benefits and
    The disadvantage of the presented technology.

    Finally, we provide e-book readers with a proof of concept with all sources,
    precompiled binaries, new sample output and less parsing based on
    output and source.


    A system phone call, as the name suggests, is a massive call to “system” by the kernel.
    System calls are the lowest level processes that persist simply because it’s the only way
    talk to the kernel regardless of what the kernel does to disk a
    Produced by a process, not visible to the main process; Processes see only
    The result of the system flag. It should be noted that your view
    I/O goes through the kernel (be it a file, a socket, etc.)

    intercept windows system calls

    While the Linux kernel guarantees ptrace(2)
    [2] API enable processes
    to intercept system calls negotiated by child processes
    [3] not Windows
    provide such functionality. However, Windows comes with a pretty
    a complete debugging environment that we won’t be using (
    i.e. we don’t use dbghelp.dll to facilitate debugging or process attachment
    in general, this requires that anti-debugging methods for
    not run Processes intercepted in this way, or RREAT
    [POC] in general.

    Windows does not natively support call interception because
    the number of kernel drivers (e.g. rootkits) that are most likely to intercept
    System calls and interception of the SSDT table
    [4], kernel installation hooks, etc.

    With the secret presented in this post, there is no need
    Manager rights to intercept system contacts
    (requires download
    Programs instead of Windows, Kernel), requires (at least) the same
    Privilege is a process that many of us want to hijack. Every technique does it
    pretty cool because on the one hand the user wait doesn’t need to be run as
    Administrator to debug another process. Second, 64-bit Windows version
    Kernels in many cases make it difficult to load drivers, and after loading
    The driver should not have time to hang anything at all (with my traditional
    Methods), PatchGuard
    data [5]
    intervenes and restores all hooks.

    ptrace(2) Approach

    The Linux kernel provides the ptrace(2) API that controls everything
    related to debugging child processes. It usually supports interception
    pc calls and does it very well, so let’s use it
    shape in our implementation.

    Ptrace(2) on Linux works like this. When a child starts a process, it’s a good system
    call, the parent (debugger) is notified before the
    A system phone call is in progress (we call this type
    triggers a pre-event from now on), from now on our own parent will be able
    Check system call arguments by reading new registers (or
    Heap, depending on system call configuration conventions
    Parents also have this opportunity
    to move arguments, becauseBecause he can change characters and write memory to
    Child. Once a mother or father completes their pre-event inspection, they will also receive a notification
    ptrace(2) whether the child can make the approach call. Linux kernel
    then continue executing the system call, unfortunately executed

    intercept windows system calls

    Ryan Tarenorerer

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