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36 votes

Objdump - How to output text (eg ASCII strings) alongside assembly code?

It is assumed here that Linux ELF32 binaries are being analyzed. Code and data such as strings are stored in separate parts of ELF binaries. To disassemble the parts containing code, use objdump -...
julian's user avatar
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14 votes
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Why do reversers nowadays reverse engineer using decompilers and not disassemblers?

Although these terms are being used interchangeably, there is an intrinsic difference between disassembler and decompiler definitions traditionally. Let's first consider common steps involved in ...
R4444's user avatar
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12 votes

What is the linux equivalent to OllyDbg and Ida Pro?

edb is a cross platform x86/x86-64 debugger. It was inspired by Ollydbg, but aims to function on x86 and x86-64 as well as multiple OS's. https://github.com/eteran/edb-debugger
firebitsbr's user avatar
11 votes

Is there any disassembler to rival IDA Pro?

Just for completeness: one more disassembler, Binary Ninja: As for now (9/26/2016) it has the following properties: Commercial ($99 as introductory price for personal use license) Handles x86, x64, ...
w s's user avatar
  • 8,508
10 votes

How to obtain x86-64 pseudocode in IDA Pro?

The two other answers here are outdated. From hex-rays website, in the page about the the hex-rays decompiler: Currently the decompiler supports compiler generated code for the x86, x64, ARM32, ARM64,...
NirIzr's user avatar
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8 votes
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idapython - Determine if item is code or data

IDA utilizes flags for checking the properties of locations. Looking at the API you can use GetFlags(ea) and pass its output to isCode(flags) to check if a location is flagged as being code. You can ...
Nordwald's user avatar
  • 2,906
8 votes
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Can AI be used to write better decompilers/disassemblers?

First, you cannot answer to this question without having to define what you mean by AI... Because this is probably the worst name for a domain in computer science. Where people think about "programs ...
perror's user avatar
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7 votes
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What type of disassembler is distorm?

DiStorm does not implement recursive traversal, however you can use distorm (or others, e.g. capstone) to implement your own recursive traversal algortihm. There are a range of tools available doing ...
Nordwald's user avatar
  • 2,906
7 votes
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idapython - Get Xrefs to a stack variable

There is one function that does this: build_stkvar_xrefs, defined in C++ but exposed via the Python SWIG bindings. IDA builds stack xrefs dynamically when you ask for it. In order to use the function, ...
mayahustle's user avatar
6 votes

Decompiling a 1990 DOS application

The Reko Decompiler is updated regularly and works for 16-bit DOS executables. It can generate C code from the disassembly. It's written in C#/.NET so requires mono if you want to run it on linux ...
movAX13h's user avatar
  • 161
6 votes

What is the linux equivalent to OllyDbg and Ida Pro?

As an (2019) addition to all the other answers: Try Ghidra. It is the Software Reverse Engineering (SRE) suit of the NSA and it's free and open source. It was leaked as part of Wikileaks' "Vault 7" ...
NullDev's user avatar
  • 161
6 votes
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How to find obfuscated hidden command line parameters?

those command line switches seems to be plainly visible in several languages kind:>kindlegen.exe -dont_append_source Info:I9018:option: -donotaddsource: Source files will not be added kind:>...
blabb's user avatar
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6 votes
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Is it safe to load a virus to IDA Pro?

At first, it is always recommended to analyze viruses inside an Isolated environment. So, you could install IDA Pro in a Virtualized Environment such as VMWare Work Station and load the binary in IDA ...
c0d3inj3cT's user avatar
6 votes

idapython - Get Xrefs to a stack variable

TL;DR: There's no simple API to achieve this, code is at the end of the answer or here. As far as I know, there is no easy way to get the references to stack structure. It seems like calling idautils....
NirIzr's user avatar
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6 votes

Do you need a 64 bit disassembler like IDA Pro to disassemble 64 bit code?

No, you don't. Despite the name, "IDA Pro 64" allowed you to analyze 64-bit files but it was itself a 32-bit program (until version 7.0).
Igor Skochinsky's user avatar
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6 votes
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Why there are only 8 hexa memory digits while my RAM is 16G

Your physical RAM size doesn't say too much about what your memory addresses will look like. What matters is your system architecture and how many bits there are (usually 64 or 32). Virtual memory ...
multithr3at3d's user avatar
5 votes
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Getting past a whole lot of anti-debug measures for a windows exe

You can use something like Scylla Hide https://github.com/nihilus/ScyllaHide It has plugins for most popular debuggers. It has lots of hiding options and presets for advanced packers like Themida. ...
Ghassan Idriss's user avatar
5 votes

What is the linux equivalent to OllyDbg and Ida Pro?

I would say radare2. It is opensource fast moving project, and it has analysis capibilites similar to that of ida, and supports many architectures like x86 and the 64bit version of x86 plus lots of ...
u185619's user avatar
  • 335
5 votes

Why there are not any disassemblers that can generate re-assemblable asm code?

By far, the established method for binary rewriting is dynamic rewriting where the binary is rewritten while being run on real inputs. Think of instrumentation tools like PIN, DynamoRIO and Dyninst ...
Codoka's user avatar
  • 403
5 votes

Reverse engineering Windows Defender's signature for Metasploit Framework's metsrv.dll

One approach you might consider involves compiling different versions of metsrv.dll from source and then observing which ones are detected and which ones are not. For instance: Comment out half the ...
Lisbeth's user avatar
  • 73
5 votes
Accepted

Can you change the architecture in Ghidra after importing?

you can right click the file you import at Active Project tab in ghidra main window, and select Set Language
mA0 nen9's user avatar
5 votes

How to convert to float

ALT-D, then Float. (Or Double, or Packed Real.)
Rolf Rolles's user avatar
  • 9,198
4 votes

Any Disassembler for iOS?

If your iPhone is jailbroken, you can use radare2 on it. You can follow the process to cross-compile it here, or simply grab the latest release from Cydia. A neat feature of radare2 is that you can ...
jvoisin's user avatar
  • 2,526
4 votes

Decompiling a 1990 DOS application

Ghidra (which is free) is able to disassemble x86 16-bit applications and even to decompile them to C (something you can't do with IDA).
tigrou's user avatar
  • 371
4 votes
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C++ to assembly, GCC vs CL

Given that you didn't specify any optimization flag and used -m32, GCC performed no optimization on your code. The -m32 flag specifies the generation of a 32 bit code for a compiler configured to ...
yaspr's user avatar
  • 2,673
4 votes
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Radare produces a bunch of `add byte [rax], al`, but why?

I am adding another answer here because the comment by op is akin to a new question this is a demo of code which is referenced but doing a pd on reference would yield a bunch of zeros and has ...
blabb's user avatar
  • 16.4k
4 votes

Radare produces a bunch of `add byte [rax], al`, but why?

add byte [eax], al This instruction is falsly and accidentally blind-translated by disassemblers that don't distinguish between stored buffer/void spans and code segs, to explain what happens here ...
Abr001am's user avatar
  • 304
4 votes
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Capstone: What's the purpose of the 'address' argument in cs_disasm()?

that address is the virtual address you want to disassemble for example you have a relative jump the opcodes will be say 0x74 {imm } where {imm} is relative to the current address either in ...
blabb's user avatar
  • 16.4k
4 votes

How to extract firmware from a chip ( snarfing)

Get the information about the chip. It may happen that firmware, that you need is stored in the external flash memory chip, not in CPU. If it's still the CPU, that you want to dump, read the ...
Anton Kukoba's user avatar
  • 1,850
4 votes
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Know which bytes are opcode and which operands in IDA

In general this is not solvable since the opcode and operands may be sharing the same bytes (e. g. some instructions encode part of their opcode in the mod R/M byte, which can also contain some of ...
Igor Skochinsky's user avatar
  • 36.7k

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