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LykanthricAura
Advanced Cheater

Reputation: 0

Joined: 17 May 2010
Posts: 58
Location: India

Posted: Tue Oct 15, 2019 7:06 am Post subject: This script doesn't turn on...

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) }
}

ParkourPenguin
I post too much

Reputation: 140

Joined: 06 Jul 2014
Posts: 4289

Posted: Tue Oct 15, 2019 9:52 am Post subject:

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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