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Large Offset in Pointer

 
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efficacy28
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Joined: 07 Jun 2010
Posts: 35

PostPosted: Thu Apr 14, 2016 4:42 am    Post subject: Large Offset in Pointer Reply with quote

I have a rather large offset
and cheat engine won't let me input the pointer:

[05B25358]+807B1348
(05B25358 points to 7FFF0000 in this case)
7FFF0000 + 807B1348 = 1007A1348 (9 placeholders)



Normally, addresses have 8 placeholders, but I'm
trying to hack a 64-bit game. When I try to use code
injection to get the address instead, it only gives me
007A1348 instead of 1007A1348. How do I bypass the
8 placeholder limitation?



Code:
alloc(missilemem,128)
label(missile)
registersymbol(missile)

missilemem:
push rax
mov rax,[05B25358]
add rax,807B1348
mov [missile],rax
pop rax
ret

missile:

createthread(missilemem)

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ParkourPenguin
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PostPosted: Thu Apr 14, 2016 9:37 am    Post subject: This post has 1 review(s) Reply with quote

With regards to the add instruction, there is no addressing mode that allows you to add an imm64 value to a register. The maximum it allows you is an imm32. The only time the add instruction modifies the upper 32 bits of a register is when it needs to sign extend it due to it being negative. Interestingly enough, it doesn't modify the upper 32 bits if it's a positive result.

Regardless of that, just move the value you're adding into another 64-bit register and add that to rax.
Code:
mov rax,7FFF0000
mov rcx,807B1348
add rax,rcx
mov [missile],rax
ret

PS:You don't have to push/pop rax if you're in your own thread. You should be returning an NTSTATUS if you're going to return so that ntdll.RtlExitUserThread can clean up the thread, but evidently it doesn't matter since nothing uses it. If you're still concerned about that, just zero out eax just before the ret and you'll be fine.

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efficacy28
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PostPosted: Thu Apr 14, 2016 11:27 pm    Post subject: Reply with quote

Thank you for the information Smile +rep
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