No, Windows Loader is entirely safe and secure for us. Theree is no virut. Before uploading her,e I also checked it using the Antivirus tool for any malicious codes. However, it will still show you as a virus because these tools are blacklisted. In this way, if you are going to use I,t, then make sure to disable any antivirus or windows defender.
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.
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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 clean installed windows 7 in legacy BIOS mode on a primary partition. I created two logical partitions for file storage. Ubuntu 16.10 was installed later using bootable USB by selecting the option 'Install alongside windows'. I think the setup created an ext4 partition to install Ubuntu.
Now when I switch on, Grub2 offers options to boot 'Ubuntu' and 'Windows 7 loader'. When I select 'Windows 7 loader' sometimes the black loader appears properly with options to boot Windows 7 or Ubuntu. But sometimes the screen just displays slanting dashed lines through.Slanted dashed lines.However instead of pressing 'Enter' on 'Windows 7 loader' option if I press 'E' I am presented with a code that can be modified.
Created a entry for Ubuntu in the loader and selected Syslinux as the type. Works. But it takes some additional time while booting to get into Ubuntu. (My diskmanagement tool shows that windows doesn't recognize the partitions Ubuntu was installed in. Probably because it recognizes only four partitions)
In addition to that, how should I add Arch to the Windows Bootloader, as I'm unsure of what I need to do with bcdedit, or if EasyBCD 2.2's compatibility with EFI is confirmed. Also, if anyone has any good program recommendations in lieu of EasyBCD, it would be appreciated.
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:
DisplayCAL (argyllcms) LUT loader can load calibration data to LUT at the highest precision available for that HW, so a video card with more that 8bit/entry LUTs and dithering at its output can show smooth gradients like a display with internal HW calibration.
I tried to encrypt my system partition (Windows 10) with VeraCrypt. During the pre-test (i.e. before any encryption started), VeraCrypt told me that the system needed to be restarted. This should have been the moment when I should have seen the VeraCrypt boot loader, but instead, I landed in EFI shell. I found out that from there I could get into BIOS by typing EXIT. I further found out that I had to disable secure boot in BIOS in order to start the VeraCrypt rescue disk (a zip-file which I extracted onto an USB stick). I tried various options and managed to get the VeraCrypt boot loader running, or so I think because it does not say VeraCrypt boot loader, but just asks for my password However, it will not accept my password, although I am sure that I typed it correctly because using F5 I could see what I typed. I did not know what to type in as PIM, so I left it empty for default. After that nothing happens, it just says (after quite a long time): "Authorization failed. Wrong password, PIM or hash. Decrypt error(3) Invalid Parameter."
Because of this, I gave up on Veracrypt (at least for now) and want to restore my original system loader. This should be possible because the disk is not encrypted yet. The problem is, I cannot find this option in the rescue disk menu. In the documentation it says:
"Your VeraCrypt Rescue Disk contains a backup of the original content of the first drive track (made before the VeraCrypt Boot Loader was written to it) and allows you to restore it if necessary. The first track typically contains a system loader or boot manager. In the Rescue Disk screen, select Repair Options -Restore original system loader."
So how do I restore the original system loader? Somewhere I read that I had to press F8 to see the rescue menu, but that does not help either. Where can I find this option? If such an option does not exist in VeraCrypt rescue disk 1.2.3, how can I use an older version? Or is it possible to restore the original system loader by other means (i.e. using EFI shell)?
You do not need to restore the original system loader because it was never removed or changed. With EFI systems VeraCrypt does not overwrite the original boot loader like it had to with MBR. What VeraCrypt does is add its own bootloader to the list, then tells the BIOS to please use it as the default one. The original boot loader should still exist completely unchanged in its original EFI folder. Sometimes the command to use the VeraCrypt bootloader is ignored, especially if secureboot was turned on in the beginning. You can usually still get into it, though.
If you want to get VeraCrypt working, or boot back from the regular Windows bootloader, it is usually as easy as selecting the default boot device and EFI loader inside you BIOS. Most BIOSes have a way to set the boot order, where you choose which devices the system attempts to boot from in which order. When you put your hard drive in that sequence, it usually allows you to select which EFI loader on that hard drive to use. When you do that, you can select the VeraCrypt bootloader if you want to try and get it working, or you can select the Windows bootloader if you just want to boot Windows normally. 17dc91bb1f
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