Windows Loader 2.1 7 Download !!BETTER!!
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Your DllMain function runs inside the loader lock, one of the few times the OS lets you run code while one of its internal locks is held. This means that you must be extra careful not to violate a lock hierarchy in your DllMain; otherwise, you are asking for a deadlock.
The loader lock is taken by any function that needs to access the list of DLLs loaded into the process. This includes functions like GetModuleHandle and GetModuleFileName. If your DllMain enters a critical section or waits on a synchronization object, and that critical section or synchronization object is owned by some code that is in turn waiting for the loader lock, you just created a deadlock:
Loader refers to the OS (module) loader.Loader Lock is a system lock used by the loader to synchronize calls to DllMain.This way, the loader ensures that initialization / cleanup tasks required by DLLs are performed in a thread-safe manner.
(...) the operating system has its own internal process-specific lock that sometimes is held while your code executes. This lock is acquired when DLLs are loaded into the process, and is therefore called the 'loader lock.' The DllMain function always executes under the loader lock; (...)
I hav a Dell inspiron 3000 working on windows 10. I recently installed ubuntu 16.04. The problem is that now when I boot Grub boot loader gives the options and I'm not very fond of it. I would like the windows boot loader (the GUI). Pls help me with the steps to do so
If you are not fond of grub than you can try BURG. It has better GUI than the windows boot loader (Trust me on this one). You can select different themes for that as well. Also if you have dual booted your system then you can remove other options from the options screen and set just two options i.e WINDOWS and LINUX. To know how to install BURG here is the link :How to install BURG on Ubuntu 16.04
I have read that the PE loader is responsible for loading executable images from disk. When and where is the control flow exactly transferred to the loader? The PE format is well documented but there seems to be a little info regarding the functioning of the loader itself.
The PE loader is exposed by a set of user APIs in kernel32.dll, under the CreateProcess family. There are different APIs for doing different things, e.g. running a process under an alternative security context.
The tricky part with your question is that the "loader" isn't really something that gets control flow. The instant you call CreateProcess, you're technically running the loader. However, the kernel part of the loader begins when ntdll!NtCreateUserProcess transitions into kernel-mode. If we're really strict about it, we might say that the first part of the loader is PspAllocateProcess, since that's what allocates the initial structures.
In the book Mastering Malware Analysis: The complete malware analyst's guide to combating malicious software, APT, cybercrime, and IoT attacks [Alexey Kleymenov, Amr Thabet], there're 2 sections in chapter 2 called "Process loading step by step" and "PE file loading step by step" which document how the Windows PE loader is loaded and how it works.
What's the best way to remove windows loader 2.2.1 by daz? I recently bootcamped my MacBook and bought a legit copy of windows, I just hadn't activated it yet and one day being bored at work (and mostly out of curiosity) activated my windows using the daz loader.
Plus im worried i could get in trouble through my company... how easy would it be for the computer department to see I am using a non payed for copy of windows considering I downloaded and installed the loader on my windows username that is on the company domain
However, in windows I can go to System recovery -> advanced startup -> troubleshoot -> advanced options -> UEFI firmware settings -> F9 Boot Menu and at this point it shows me 2 boot loaders: one for windows (at top) and one for ubuntu (2nd). I can select one or the other, but cannot change the order. If I select the ubuntu loader, it starts grub, shows me an option for windows as well as ubuntu, and will boot ubuntu if selected.
A loader is code that prepares other code for execution. Loaders take data
corresponding to a program or library and prepare it to be read, modified, and/or executed. This preparation process typically involves steps such as parsing a file containing the code to be run, metadata about that code, and other relevant bits of information such as the external services it might need from other parts of the operating system. Additionally, things like resolving external dependencies - or other, external bits of code the bit being prepared will rely upon, setting memory protections appropriately, and perhaps updating references (if the code is not position independent) will happen here.
Nearly all modern consumer-facing operating systems contain loaders. Loading occurs during the initialization of a process (when the primary application image is loaded), and also may occur in an ad-hoc fashion throughout program execution, as dynamic libraries (to include .dlls, .dylibs, and .sos, for example) are loaded and unloaded.
In the context of things like threat emulation, there is a strong desire to model trends present within the modern malware ecosystem - including the ability to operate in memory only. This presents a bit of a challenge: in Windows, for example, the operating system's built-in loader
only accepts binary files on disk. What we desire is a reflective loader
that will perform some of the same kinds of preparations that the native operating system's loader would handle, but without the requirement that the loaded binary reside on disk (note that some operating systems, such as MacOS, have facilities for executing directly in-memory natively).
The reflective_loadlibrary function accepts three arguments. First, it accepts
a loader_ctx, which contains a pointer to a structure we will use to manage contextual information that the loader will need as we implement it. Next, it accepts a buffer and its corresponding size, which represent the module that we wish to load. The function returns a LoaderStatus, which is a type we've created to help provide status results around success or failure as loader development progresses.
The Portable Executable (PE) format is a file format for executables, DLLs, Drivers, and some more exotic kinds of files on 32- and 64-bit versions of Windows. It contains all the information Windows needs to load and execute the specified module. Since we're re-implementing some of the Windows loader's functionality, we'll also need to parse PE files during the course of loading and executing.
For robustness, we'll want to verify that the buffer that our reflective loader receives is actually a PE file. A simple validation technique is to check that (a) the e_magic value is correct, and (b) that the RVA of the NT headers resides within the bounds of our buffer. The code snippet below illustrates how we might perform these checks.
The first field is a bit poorly named, as it is actually an RVA, coupled with a size. We will visit quite a few of these table entries as we progress through the loader development sections that follow.
While many allocator APIs exist in Windows, some special considerations must be applied to requesting memory for our loader. In particular, we have some special alignment and protection requirements (in general) that we will need to adhere to in order to ensure that our program will perform properly once loaded.
To keep things simple, we will start with VirtualAlloc, but keep in mind that other options exist, and may have different implications in terms of how our memory footprint looks forensically. So how much space should we get? In order to obtain that information, we should refer back to the IMAGE_OPTIONAL_HEADER structure from the last section, in particular, the SizeOfImage field. Thus, we can update our loader method as follows:
hey, I have windows xp and suse dual booted
or at least I did, the file system of suse developed a fault, and I had to run the repair scanner on the suse dvd.
out of many things it found wrong it claimed something was wrong with my boot loader, so when I let it get on with it, suddenly suse and failsafe suse was the only 2 listed, windows was gone, so I tried to manually add windows back.
I went to /mnt/windows/C/boot.ini
thank you swerdna, that worked perfectly.
if anyone comes after me reading this thread they should know that I think the directory I pasted in was from the windows wine directory, not the dual boot windows, very stupid mistake I know
how do i back up the current mbr before suse installs grub on it?
Booting of windows XP in classical xp fashion (whereby you lose booting to openSUSE) can be re-installed by doing two things:
1: Make sure the windows partition that contains the bootloader files (usually sda1) is the active partition. You can check and manipulate that with this command in a console:
This is Jonathan Lim and Ateeq Sharfuddin, and in this blog we share a project we are open sourcing: SCYTHE's standard Windows C In-memory Module Loader. We provide a brief overview of loaders and share how we load our capabilities with the community.
There are three well-known mechanisms a program can choose to use other software [3]: static linking, dynamic linking, and dynamic loading. In Windows, dynamic linking and dynamic loading are handled by the Windows loader, and are done at load time and runtime, respectively.
In an adversarial scenario, the shared library would be transmitted over the wire into memory and a loader similar to what we are sharing would load this shared library from memory without any need to write it to disk first.
The solution contains source code for the loader. The source code is compiled into a static library (.lib). A sample DLL is provided, as well as an executable, which when invoked reads this sample DLL into memory and then loads it and calls a function inside it.