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Index > Windows > CreateProcess Problem

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asmrox



Joined: 19 Jan 2008
Posts: 160
asmrox
I used createfile bo get a write handle to file. File is creating, process too (return 1), and file is enpty =/ What did i wrong?

Code:
format pe console
section '.code' code readable executable


push 0
push 0x80
push 2
push 0
push 0
push 0x10000000
push fp
call [CreateFileA]
mov [output],eax
mov [output1],eax


push PROCESS_INFORMATION
push STARTUPINFO
push 0
push 0
push 0
push 0
push 0
push 0
push cmd
push 0
call [CreateProcessA]
push eax
push f
call [printf]
add esp,8

push [output]
call [CloseHandle]


push [output1]
call [CloseHandle]
retn
section '.data' data readable writeable
fp db 'file.txt',0
cmd db 'c:\windows\system32\cmd.exe',0
f db '%d',13,10,0
PROCESS_INFORMATION:
dd 4 dup 0
STARTUPINFO:
dd 68
dd 10 dup 0
dd 256
dd 2 dup 0
dd 0
output dd 0
output1 dd 0
section '.idata' import data readable
dd 0,0,0,RVA kernel32_name,RVA kernel32_table
dd 0,0,0,RVA msvcrt_name,RVA msvcrt_table
dd 5 dup 0
kernel32_table:
CreateProcessA dd RVA _CreateProcessA
CreateFileA dd RVA _CreateFileA
GetLastError dd RVA _GetLastError
VirtualAlloc dd RVA _VirtualAlloc
CloseHandle dd RVA _CloseHandle
dd 0
msvcrt_table:
memset dd RVA _memset
printf dd RVA _printf
dd 0
kernel32_name db 'kernel32.dll',0
msvcrt_name db 'msvcrt.dll',0
_CreateProcessA db 0,0,'CreateProcessA',0
_CreateFileA db 0,0,'CreateFileA',0
_GetLastError db 0,0,'GetLastError',0
_VirtualAlloc db 0,0,'VirtualAlloc',0
_CloseHandle db 0,0,'CloseHandle',0
_memset db 0,0,'memset',0
_printf db 0,0,'printf',0    
Post 28 Jan 2008, 19:18
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17664
Location: In your JS exploiting you and your system
revolution
You need to use WriteFile to write data into the newly created file.
Post 28 Jan 2008, 19:38
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asmrox



Joined: 19 Jan 2008
Posts: 160
asmrox
CreateProcess write to it. i replaced orginal stdout with my handle, so it should work.
Post 28 Jan 2008, 20:08
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Yardman



Joined: 12 Apr 2005
Posts: 245
Location: US
Yardman
[ Post removed by author. ]


Last edited by Yardman on 04 Apr 2012, 03:01; edited 1 time in total
Post 29 Jan 2008, 15:48
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17664
Location: In your JS exploiting you and your system
revolution
asmrox,

You need to give time for the target process to start. After creating the process, sleep for a short while then close the file handle.

TFM wrote:
CreateProcess returns without waiting for the new process to finish its initialization
Post 29 Jan 2008, 15:55
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Yardman



Joined: 12 Apr 2005
Posts: 245
Location: US
Yardman
[ Post removed by author. ]


Last edited by Yardman on 04 Apr 2012, 03:03; edited 1 time in total
Post 29 Jan 2008, 16:34
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TNick



Joined: 29 Jan 2008
Posts: 13
Location: Brasov, Romania
TNick
Hello!
Quote:

Perhaps you
should also do a CloseHandle on the process that you
create.

Both on the process handle and on the thread handle, which are returned in
PROCESS_INFORMATION Structure.

Nick
Post 29 Jan 2008, 16:48
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asmrox



Joined: 19 Jan 2008
Posts: 160
asmrox
huh? why 'welcome prompt' go on stderr?


and how i do this with stdin?
push 0
push 0x80
push 3
push 0
push 0x00000001
push 0x80000000
push fp2
call [CreateFileA]
mov [input],eax

and input is in startupinfo structure.

in reading file i put dir\r\n, but in output thers no result of it =(
Post 30 Jan 2008, 17:02
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OzzY



Joined: 19 Sep 2003
Posts: 1029
Location: Everywhere
OzzY
Talking about process I'll ask my question here: How to patch a process in memory? Do you have example code?

Thanks
Post 30 Jan 2008, 21:39
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17664
Location: In your JS exploiting you and your system
revolution
OzzY wrote:
Talking about process I'll ask my question here: How to patch a process in memory?
WriteProcessMemory
Post 30 Jan 2008, 21:45
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