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need help writing a code injection for a double value type.

 
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junguler
How do I cheat?
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Joined: 07 Jan 2015
Posts: 6
PostPosted: Wed Jan 07, 2015 7:03 am    Post subject: need help writing a code injection for a double value type. Reply with quote
hi,

i've been trying to write a code injection for step 4 of the tutorial, but i don't know how to do it with the double value type.

i made the float value with (float) but when i tried to make the double value with (double) it didn't work.

here is my float code:

Code:

define(address,"Tutorial-i386.exe"+25DF0)
define(bytes,D9 9B 94 04 00 00)

[ENABLE]

assert(address,bytes)
alloc(newmem,$1000)

label(code)
label(return)

newmem:

code:
  mov [ebx+00000494],(float)5000
  jmp return

address:
  jmp code
  nop
return:

[DISABLE]

address:
  db bytes

dealloc(newmem)


and here's the unchanged double code which i couldn't figure out how to change.

Code:

define(address,"Tutorial-i386.exe"+25B9B)
define(bytes,DD 9B 98 04 00 00)

[ENABLE]

assert(address,bytes)
alloc(newmem,$1000)

label(code)
label(return)

newmem:

code:
  fstp qword ptr [ebx+00000498]
  jmp return

address:
  jmp code
  nop
return:

[DISABLE]

address:
  db bytes

dealloc(newmem)


also if anyone can tell me how to put two or more code pointed to different memory addresses to 1 script it would be really appreciated.
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mgr.inz.Player
I post too much
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Joined: 07 Nov 2008
Posts: 4438
Location: W kraju nad Wisla. UTC+01:00
PostPosted: Wed Jan 07, 2015 7:50 am    Post subject: Reply with quote
First code should be:
Code:

define(address,"Tutorial-i386.exe"+25DF0)
define(bytes,D9 9B 94 04 00 00)

[ENABLE]

assert(address,bytes)
alloc(newmem,$1000)

label(return)

newmem:
  // commented out fstp dword ptr [ebx+00000494]

  // balance the FPU stack
  fstp ST(0)

  // update value
  mov [ebx+00000494],(float)5000


  jmp return

address:
  jmp newmem
  nop
return:

[DISABLE]

address:
  db bytes
  // fstp dword ptr [ebx+00000494]

dealloc(newmem)

(note: I'm using different AA template, but, you should understand it too)




Second code should be:
Code:

define(address,"Tutorial-i386.exe"+25B9B)
define(bytes,DD 9B 98 04 00 00)

[ENABLE]

assert(address,bytes)
alloc(newmem,$1000)

label(return)
label(ourDoubleValue)

newmem:

  // pop value from FPU stack (top)
  fstp ST(0)

  // get new value
  fld qword ptr [ourDoubleValue]

  // update value
  fstp qword ptr [ebx+00000498]

  jmp return


ourDoubleValue:
dq (double)5000

address:
  jmp newmem
  nop
return:

[DISABLE]

address:
  db bytes
  // fstp qword ptr [ebx+00000498]

dealloc(newmem)

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junguler
How do I cheat?
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Joined: 07 Jan 2015
Posts: 6
PostPosted: Wed Jan 07, 2015 7:59 am    Post subject: Reply with quote
thanks, that really helps <3
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