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Topic created on: June 24, 2010 04:26 CDT by romaindu86 .

Hello i am french and novice whith IDA i would like to know how to change an instruction.For exemple a jump JNZ to JZ.
help please

voila		June 24, 2010 11:37.38 CDT
hi there .. you can try this way. suppose instruction is jnz loc_1234 .. then double click on "jnz" , then go to view hex editor .. there you will see bytes for jnz automatically selected .. then right click there on sleected bytes .. select "edit" .. then u done :) . hope this will works for u

romaindu86		June 24, 2010 14:18.11 CDT
then i double click on "jnz" i see bytes selected but i can't edit.When i do right click they don't have "edit". Sorry for my english

voila		June 24, 2010 15:54.26 CDT
hi there .. your english in fine enough to let us understand what u want to say :) .. now i give my final try .. step 1 -> open exe in ida pro .. go to the instruction you want to change step 2 -> now note down the OFFSET of the instruction(just above the scroll bar) ..... close IDA step 3 -> now open the same exe into hex editor .. go to the same offset .. step 4 -> now changes bytes here according to your desire instruction step 5 -> save changes .. step 6 -> again open the exe in ida , then again go to same offset to check the changes you made .. step 7 -> i m sure this will works for you :)

romaindu86		June 25, 2010 04:55.48 CDT
ok thanks I thought we could do directly with ida. thank you again

ping24		July 16, 2010 07:39.36 CDT
BTW, why IDA doesn't give this freedom to change the instructions on the fly? -Ping

ConsoleFx		July 18, 2010 02:31.14 CDT
Well no need to use Hex Editors though. You can make use of Immunity/Olly to change the instructions on the fly. That would be more convenient than changing the opcodes through Hex Editors. Hope it helps!

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