5

The entry point isn't the address where you starts analyzing, but the address from where the process starts executing. Let's have a quick look at the ELF32 Header: #define EI_NIDENT 16 typedef struct { unsigned char e_ident[EI_NIDENT]; Elf32_Half e_type; Elf32_Half e_machine; Elf32_Word e_version; ...


5

When a debugger wants to attach to a process it will do the following things (see the DebugActiveProcess implementation on ReactOS): Connect to the debuggee with DbgUiConnectToDbg Tell the kernel to start debugging the process with NtDebugActiveProcess Issue a DbgBreakPoint in the attached-to process with DbgUiIssueRemoteBreakin The DbgUiIssueRemoteBreakin ...


5

With global optimisation (link-time code generation) the compiler is free to ignore the declared calling convention for all functions that aren't externally visible - that is, neither exported nor otherwise pinned by having their addresses taken and passed to external code. This can make the resulting binaries difficult to analyse since even the well-known ...


4

You need to switch to a different command line. Currently, you're using the WinDbg command line, which allows you to send commands to WinDbg instead of IDAPython: Click on WinDbg, or press Ctrl↑ to switch to IDAPython, where idaapi.get_imagebase() works fine: However, this doesn't really answer your question. What you want is the entry point, and to find ...


4

From https://code.google.com/p/corkami/wiki/PE#PointerToRawData -- if a section's physical start is lower than 200h (the lower limit for standard alignment), it is rounded down to 0. Thus, the entry point's physical offset would be: 0x00000018 = 0x00000000 + 0x00001018 - 0x00001000 (PointerToRawData_rounded_down + AddressOfEntryPoint - VirtualAddress)


3

How can I find the entry point of this binary? There's a special radare2 command for this, ie: $ r2 /program_name -- Change the registers of the child process in this way: 'dr eax=0x333' [0x00400530]> ie [Entrypoints] vaddr=0x00400530 paddr=0x00000530 baddr=0x00400000 laddr=0x00000000 haddr=0x00000018 type=program 1 entrypoints The command iM will ...


3

The values are in little-endian I believe so the stack pointer is at 0x20000510 and the reset vector is 0x0800a905.


3

It is an old anti-debugging trick to use the TLS callback. The code in the TLS gets executed before the executables entry point and the debugger gains control. This allows the TLS to check for the presence of the debugger and act accordingly. One method to bypass it is using OllyDbg is to pause at "System breakpoint" instead of the default "WinMain" and I ...


3

The binary is not a single monolithic block. I figured out the structure but it took a few false starts. First I loaded the Binary into IDA starting from offset 0x200 as you hinted. The functions were disassembled okay but the data references were mostly off. So I looked at the strings to see if there may be some candidates for a string table. This bunch ...


2

First, please read this. Essentially the difference is (in both cases) that one - the entry point - refers to the address where the initial code will be located and the other - "main function" - will be the one provided by the (C) runtime, potentially hiding gory details from you. From what I understand, Start is the entry point for an exe and it does ...


2

You are sort of comparing oranges and apples. In the first example, you are looking at the arguments passed to the main function by the C library, and they match the C standard requirements (array of char pointers). In the second example, you are looking at the low level entry point to the binary and the parameters from the kernel, before they have been ...


2

When you open a DLL file with IDA, if IDA is able to find the DllMain() function then it will automatically navigate to that function when you first disassemble the DLL. Note that the DLL's entry point (which IDA names "DllEntryPoint") does not always (and in fact often does not) point to the DllMain() function. You can see in the image below (full-size at ...


2

Is Olly 2.01 actually "smarter", recognizing the packer and stopping at the unpacked OEP? Yes! You can disable it in OllyDbg's options though by going to Debugging → SFX and unchecking Unpack SFX modules automatically:


2

To read with readelf the parameter is "-s": Options are: -a --all Equivalent to: -h -l -S -s -r -d -V -A -I -h --file-header Display the ELF file header -l --program-headers Display the program headers --segments An alias for --program-headers -S --section-headers Display the sections' header -...


2

No! Entry point is the "keyword" used to point at the location at which the OS loader will start a program. For a given binary file (ELFBIN), you can run the following command to read the binary's header information (-h): readelf -h ELFBIN You'll obtain an output similar to this: ELF Header: Magic: 7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 ...


1

Entry point is where system loader will start execution of your executable. It's the entrypoint for the Operating system to begin execution in your program. The analogy could be "main()" function for C/C++ compilers.


1

Exceptions in TLSCallbacks are discarded by Windows, but stop further callbacks from being called, and then control is transferred to the main entrypoint. However, the code that you've shown for the TLSCallback looks like garbage, the registers aren't predictable, and I doubt that what you've shown is actually executed. Note that the TLSCallback field not ...


1

TLS callbacks may be executed on attach because the OS creates a new thread pointing to DbgUiBreakin with a software breakpoint to stop the execution of the program, and the new thread causes the TLS callback to be executed.


1

It is important to do the entire process inside a virtual machine to avoid any additional file infections and/or suffer the malicious effects of the virus. Finding the original entry point This is not a trivial task, since once the PE's entry point changes it is no longer recorded anywhere in the PR header. The only way to find the original entry point is ...


1

From the PDF to which you linked: 3.3.4 Boot modes At startup, boot pins are used to select one of three boot options: Boot from Flash memory Boot from System Memory Boot from embedded RAM The boot loader is located in System Memory. It is used to reprogram the Flash memory by using USART1 or USART2. See STM32™ microcontroller ...


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