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AOB script, multiply fstp dword ptr [eax+20]

 
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noyuw
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Joined: 26 Oct 2015
Posts: 12

PostPosted: Fri Apr 21, 2017 5:11 pm    Post subject: AOB script, multiply fstp dword ptr [eax+20] Reply with quote

Hello,

I have a float value that i want to multiply by let's say 5.4, i tried several time now with "imul" but didn't find out so here i am

Here is my AOB code:
Code:

[ENABLE]

aobscan(INJECT,D9 58 20 C9 C3) // should be unique
alloc(newmem,$1000)

label(code)
label(return)

newmem:

code:
  fstp dword ptr [eax+20]

  leave
  ret
  jmp return

INJECT:
  jmp newmem
return:
registersymbol(INJECT)

[DISABLE]

INJECT:
  db D9 58 20 C9 C3

unregistersymbol(INJECT)
dealloc(newmem)

{
// ORIGINAL CODE - INJECTION POINT: 068BE08F

""+68BE072: 00 00                          -  add [eax],al
""+68BE074: 00 00                          -  add [eax],al
""+68BE076: 00 00                          -  add [eax],al
""+68BE078: 55                             -  push ebp
""+68BE079: 8B EC                          -  mov ebp,esp
""+68BE07B: 83 EC 08                       -  sub esp,08
""+68BE07E: 8B 45 08                       -  mov eax,[ebp+08]
""+68BE081: C7 40 38 00 00 00 00           -  mov [eax+38],00000000
""+68BE088: C6 40 44 00                    -  mov byte ptr [eax+44],00
""+68BE08C: D9 45 0C                       -  fld dword ptr [ebp+0C]
// ---------- INJECTING HERE ----------
""+68BE08F: D9 58 20                       -  fstp dword ptr [eax+20]
""+68BE092: C9                             -  leave
""+68BE093: C3                             -  ret
// ---------- DONE INJECTING  ----------
""+68BE094: 00 00                          -  add [eax],al
""+68BE096: 00 00                          -  add [eax],al
""+68BE098: 55                             -  push ebp
""+68BE099: 8B EC                          -  mov ebp,esp
""+68BE09B: 83 EC 28                       -  sub esp,28
""+68BE09E: D9 45 0C                       -  fld dword ptr [ebp+0C]
""+68BE0A1: D9 45 10                       -  fld dword ptr [ebp+10]
""+68BE0A4: D9 45 14                       -  fld dword ptr [ebp+14]
""+68BE0A7: D9 45 18                       -  fld dword ptr [ebp+18]
""+68BE0AA: C7 45 E0 00 00 00 00           -  mov [ebp-20],00000000
}


Thanks for the help
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Zanzer
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Joined: 09 Jun 2013
Posts: 3235

PostPosted: Fri Apr 21, 2017 9:57 pm    Post subject: Reply with quote

Code:
aobscan(INJECT,D9 58 20 C9 C3) // should be unique
alloc(newmem,$1000)

label(code)
label(return)
label(myvar)

newmem:

code:
  fmul [myvar]
  fstp dword ptr [eax+20]

  leave
  ret
  jmp return

myvar:
  dd (float)5.4

INJECT:
  jmp newmem
return:
registersymbol(INJECT)
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noyuw
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Joined: 26 Oct 2015
Posts: 12

PostPosted: Sat Apr 22, 2017 2:40 am    Post subject: Reply with quote

Wooo works like a charm, thanks you very much
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