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Is there a tool that disassembles x86 executables, presents it in a GUI where you can edit the assembly commands, and reassembles it when you want to save/patch the exe?

All it would need is a tool that disassembles and reassembles x86 executables into a kind of text format .. like what ildump does with .NET.

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Use IDA Pro with pe_write.idc.

There's a full walk-through here: http://resources.infosecinstitute.com/applied-cracking-byte-patching-ida-pro/

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Use IDA Pro. This is exactly the tool you're asking for. For patching the binary, use the options under the menu Edit -> Patch.

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  • How do you edit an opcode with IDA? I can't find any way of doing that. – Robin Rodricks Mar 27 '14 at 4:55
  • Either in the hex viewer or via Edit -> Patch program -> Change byte/word or Assemble. My guess is that you're using "an old version" of IDA. In this case, you need to modify $IDA_DIR/cfg/idagui.cfg uncomenting the line that refers to the patch menu. – joxeankoret Mar 27 '14 at 8:26
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Althought the 'GUI' is console based, I always used HIEW.

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Ollydbg is a free tool - it's more of a debugger than a disassembler.

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