hardcoded adresses

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asmrox

Joined: 19 Jan 2008
Posts: 160

asmrox 29 Feb 2008, 08:56

Code:

format pe console
section '.code' code readable executable
push 0
push 0
push 0
push 0
call 0x77D7050B
ret
section '.idata' import data readable
dd 0,0,0,RVA user32_name,RVA user32_table
dd 0,0,0,0,0
user32_table:
dd rva 1
dd 0
user32_name db 'user32.dll',0

i imported 1 function under index 1, and call to messageboxa work. i understand that user32.dll is loaded only if is imported at least 1 function.

Can i use it in my shellcode, and call to kernel32 (wich is always loaded)?
or msvcrt for sprintf, it helps alot Smile

29 Feb 2008, 08:56

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 19096
Location: In your JS exploiting you and your system

revolution 29 Feb 2008, 09:27

asmrox wrote:

...
call 0x77D7050B
...[/code]
i imported 1 function under index 1, and call to messageboxa work. i understand that user32.dll is loaded only if is imported at least 1 function.

Can i use it in my shellcode, and call to kernel32 (wich is always loaded)?
or msvcrt for sprintf, it helps alot

Short answer NO! You waste your time, the addresses change with patch level and version. That address you show is not even mapped on my XP SP2 with user32 loaded.

29 Feb 2008, 09:27

f0dder

Joined: 19 Feb 2004
Posts: 3170
Location: Denmark

f0dder 29 Feb 2008, 13:37

And stop writing shellcode ffs, spend your time on something useful.

29 Feb 2008, 13:37

asmrox

Joined: 19 Jan 2008
Posts: 160

asmrox 29 Feb 2008, 22:25

shellcoding is veru useful, i learn opcodes, modyfing programs as well as format specifications and kernel itself. In higher mnemonic-based level i would have never learned so much.

29 Feb 2008, 22:25

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