In order to use a hex editor, I need to know how to convert the replacement mnemonic into hex.

For example, I want to replace
test eax, eax
by
xor eax,eax

I know that "xor eax,eax" is "33C0", but are there any free tools that would do this conversion.

I suppose the tool would be similar to the Windows calculator, where I can type in a decimal value and convert it to hex, octal, or binary.

Regards,
Alan

why don't you try writting your own code.
I thik it is simple to code..

look in ollydbg, assemble the command you want and look the mnemonic.

Ricardo Narvaja

Thanks Ricardo.

Each time someone answers one of my posts on this forum, I learn some more about Ollydbg.

I've spent a few weeks comparing hex editors such as HIEW, BIEW, HDD, Hackman. Some of these editors can patch files, but not memory. I didn't know Ollydbg can do both

Regards,
Alan

This is a BAT script that I run for this type of thing. Create a file named t.asm and write all the code you want to convert, then run this cmd file.

@echo off
ml /c /coff /nologo t.asm
dumpbin /disasm t.obj
del t.obj

Hello for all of you who dont know there is a program called RTA that converts assembly commands to mnemonic I have uploaded it to Rapidshare here is the URL http://rapidshare.de/files/2078939/RTa_2.0.zip.html ("http://rapidshare.de/files/2078939/RTa_2.0.zip.html") its a free tool

For ALL of the need to know: Hiew will take care simply of all editing,Anyone w/ A quable to this?.