![]() ![]() Explore the behavior difference of debuggers on int 2dh.Debugging and modification of binary executable programs.Basic control flow constructs in x86 assembly. ![]() Find out as many ways as possible to make a program run differently in a debugged environment from a regular execution (using int 2d)?. ![]() If you have 4GB or more memory, you can use a portion of thememory as cache to accelerate local disks, including mechanicaldisks, SSDs and flash drives, and iSCSI disks. ![]() Im not sure whats causing it but I have a couple of dumps located in this. If you have memory not seen by Windows, usually in 32-bitWindows, you can use this hidden memory as cache to acceleratelocal disks and iSCSI disks. The behavior of int 2d instructions may be affected by many factors, e.g., the SEH handler installed by the program itself, whether the program is running under a ring 3 debugger, whether the OS is running in the debugged mode, the program logic of the OS exception handler (KiDispatch), the value of registers when int 2d is requested (determining the service that is requested). I get a BSOD with the KERNEL SECURITY CHECK FAILURE error showing every time I plug in a USB, whether it be mouse, keyboard or external storage device. In the following, we use an experimental approach to explore the possible ways to make a program behave differently when running in a virtual machine and debugged environment. In addition the the immunity debugger, we are going to use WinDbg in this tutorial. Before we proceed, we need to configure it properly on the host machine and the guest XP. If you have not installed the guest VM, please follow the instructions of Tutorial 1. Pay special attention to Seciton 3.1 (how to set up the serial port of the XP Guest). ![]()
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