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Write binary values through code injection

 
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Fatamorgen
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Joined: 17 Feb 2021
Posts: 29
PostPosted: Tue Mar 23, 2021 7:34 pm    Post subject: Write binary values through code injection Reply with quote
Hello everyone.

Is there a way to compare binary values using code injection?

I know I can use:

Code:
CMP Byte ptr [00000001],0F
CMP Word ptr [00000001],0FFF
CMP Dword ptr [00000001],0FFFFF0F
CMP Qword ptr [00000001],0FFFFFFFFFFFFFFF


But I can't use something like "Bit ptr".

If it's not possible through code injection I would like to know if is there a way to use a code available on the address list.

I tried this, but it didn't work

e.g

Code:
[ENABLE]
assert(address,bytes)
alloc(newmem,$500)

label(addresslistcode)
registersymbol(addresslistcode)

label(code)
label(return)
label(falt)


newmen:
code:
cmp [addresslistcode],1   //A pointer set as binary on the addresslist (Length = 10 and Startbit = 0)
jne activateweapon
jmp return

activateweapon:
MOV byte ptr [00140255],127

address:
  jmp newmem
return:

[DISABLE]
unregistersymbol(addresslistcode)

address:
  db bytes
dealloc(newmem)
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ParkourPenguin
I post too much
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Joined: 06 Jul 2014
Posts: 4718
PostPosted: Tue Mar 23, 2021 8:00 pm    Post subject: Reply with quote
Processors access memory on a byte granularity. If you want bit granularity, you'll have to do that yourself with bitwise operators.

e.g. to compare bits 4..6 of edi with bits 2..3 of esi:
Code:
shr edi,4
shr esi,2
and edi,7
and esi,3
cmp edi,esi
...

_________________
I don't know where I'm going, but I'll figure it out when I get there.
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Fatamorgen
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Reputation: 0

Joined: 17 Feb 2021
Posts: 29
PostPosted: Wed Mar 24, 2021 6:59 pm    Post subject: Reply with quote
ParkourPenguin wrote:
Processors access memory on a byte granularity. If you want bit granularity, you'll have to do that yourself with bitwise operators.

e.g. to compare bits 4..6 of edi with bits 2..3 of esi:
Code:
shr edi,4
shr esi,2
and edi,7
and esi,3
cmp edi,esi
...


I'll try that. Thanks Mr. Penguin
Watch out for batman.
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