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This script doesn't turn on...

 
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LykanthricAura
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Joined: 17 May 2010
Posts: 47
Location: India

PostPosted: Tue Oct 15, 2019 7:06 am    Post subject: This script doesn't turn on... Reply with quote

I am new to the whole.. x64 instruction. And I know this is a shitty logic. But I thought it would AT LEAST work. If not in the more eloquent way.

But It won't even enable.. so I am questioning the very instructions.
Help please?

Code:
[ENABLE]
alloc(codecave,1000)
label(orig)
label(return)
label(_check)
label(_value)
registersymbol(codecave)
registersymbol(_check)
registersymbol(_value)

_check:
  dd 0

_value:
  dd 190.0

B8EC0334:
  db 90 90 90
  jmp codecave
//movss [rsi+000000C0],xmm5
  return:


codecave:
  ptest  xmm5,[_check]
  jnz orig
  addsd xmm5,[_value]

  orig:
  movss [rsi+000000C0],xmm5
  jmp return

[DISABLE]

B8EC0334:
db F3 0F 11 AE C0 00 00 00 //movss [rsi+000000C0],xmm5

dealloc(codecave)
unregistersymbol(_check)
unregistersymbol(_value)
unregistersymbol(codecave)


{
// ORIGINAL CODE - INJECTION POINT: B8EC0334

//B8EC0306 - F3 0F10 86 C0000000   - movss xmm0,[rsi+000000C0]
//B8EC030E - F3 0F5A C0            - cvtss2sd xmm0,xmm0
B8EC0312 - F3 0F10 4D B4         - movss xmm1,[rbp-4C]
B8EC0317 - F3 0F5A C9            - cvtss2sd xmm1,xmm1
B8EC031B - 66 0F2F C8            - comisd xmm1,xmm0
B8EC031F - 7A 06                 - jp B8EC0327
B8EC0321 - 0F84 61000000         - je B8EC0388
B8EC0327 - F3 0F10 45 B4         - movss xmm0,[rbp-4C]
B8EC032C - F3 0F5A C0            - cvtss2sd xmm0,xmm0
B8EC0330 - F2 0F5A E8            - cvtsd2ss xmm5,xmm0
=======================================================================
//B8EC0334 - F3 0F11 AE C0000000   - movss [rsi+000000C0],xmm5

========================================================================
//B8EC033B - 48 8B 46 40           - mov rax,[rsi+40]
//B8EC033D - 48 89 45 A0           - mov [rbp-60],rax
//B8EC0344 - F3 0F10 45 B4         - movss xmm0,[rbp-4C]
//B8EC0349 - F3 0F5A C0            - cvtss2sd xmm0,xmm0
//B8EC034D - 48 63 56 68           - movsxd  rdx,dword ptr [rsi+68]
//B8EC0351 - F2 0F5A C0            - cvtsd2ss xmm0,xmm0
//B8EC0355 - 48 83 EC 20           - sub rsp,20 { 32 }
//B8EC0359 - 49 BB 1007ECB800000000 - mov r11,00000000B8EC0710 //{ (-326416299) }
}
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ParkourPenguin
I post too much
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Joined: 06 Jul 2014
Posts: 2335

PostPosted: Tue Oct 15, 2019 9:52 am    Post subject: Reply with quote

Code:
[ENABLE]
alloc(codecave,4096,B8EC0334)  // allocate full page; specifies +-2GB region to allocate in
label(orig)
label(return)
label(_value)
registersymbol(codecave)
registersymbol(_value)

B8EC0334:  // this address should be found by aobscan or referred to by name.dll+offset
  jmp codecave    // minor deficiency: put jmp before nops
  db 90 90 90
return:

codecave:
  ptest  xmm5,xmm5    // ptest takes an xmm/m128 (maybe you're looking for ucomiss)
  jnz orig            // jumps if all packed values in xmm5 are 0; not just the first one
  addss xmm5,[_value] // You define _value as a float; should be addss instead of addsd
orig:
  movss [rsi+000000C0],xmm5
  jmp return

// labels must be specified under an address
codecave+800:
_value:
  dd (float)190.0   // I don't know if this makes any difference, but it's nice

[DISABLE]
B8EC0334:
db F3 0F 11 AE C0 00 00 00 //movss [rsi+000000C0],xmm5

dealloc(codecave)
unregistersymbol(_value)
unregistersymbol(codecave)

_________________
I don't know where I'm going, but I'll figure it out when I get there.
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