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A Simple Solution to STEP 9

 
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Jiehfeng
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Joined: 03 Jan 2014
Posts: 107

PostPosted: Wed Aug 17, 2016 11:20 am    Post subject: A Simple Solution to STEP 9 Reply with quote

In the tutorial, 4 of the players have string names. Dave, Eric, HAL and KITT.
You can use those to target who ever you like.

[ebx+15] has the string names.

Code:

//Dave unlimited health
[ENABLE]
//code from here to '[DISABLE]' will be used to enable the cheat
alloc(newmem,2048)
label(returnhere)
label(originalcode)
label(exit)
label(cheat)

newmem: //this is allocated memory, you have read,write,execute access
//place your code here

originalcode:
cmp word ptr [ebx+15],'Da'  //two characters per cmp is only possible
cmp word ptr [ebx+17],'ve'   //after the two characters 'Da', add 2 to the offset, and if the string has more characters, keep adding two etc.
je cheat
mov [ebx+04],eax
fldz

exit:
jmp returnhere

cheat:
mov [ebx+04],(float)100
fldz
jmp exit


"Tutorial-i386.exe"+261D7:
jmp newmem
returnhere:


 
 
[DISABLE]
//code from here till the end of the code will be used to disable the cheat
dealloc(newmem)
"Tutorial-i386.exe"+261D7:
mov [ebx+04],eax
fldz
//Alt: db 89 43 04 D9 EE



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Zanzer
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Joined: 09 Jun 2013
Posts: 3220

PostPosted: Wed Aug 17, 2016 6:31 pm    Post subject: Reply with quote

You can actually compare 4 characters at a time.
Code:
cmp dword ptr [ebx+15],'Dave'
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Jiehfeng
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Joined: 03 Jan 2014
Posts: 107

PostPosted: Thu Aug 18, 2016 12:01 am    Post subject: Reply with quote

Zanzer wrote:
You can actually compare 4 characters at a time.
Code:
cmp dword ptr [ebx+15],'Dave'


Or that. Laughing

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djdoom32
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Joined: 11 Mar 2012
Posts: 19
Location: germany

PostPosted: Fri Aug 19, 2016 3:05 pm    Post subject: Reply with quote

why not this way:

[ENABLE]

aobscanmodule(INJECT,Tutorial-i386.exe,89 43 04 D9 EE)
alloc(newmem,$1000)

label(code)
label(newcode)
label(return)

newmem:

newcode:
cmp dword ptr [ebx+15],'Dave'
je code
cmp dword ptr [ebx+15],'Eric'
je code
mov [ebx+04],eax
fldz
jmp return

code:
mov [ebx+04],(float)100
fldz
jmp return

INJECT:
jmp newcode
return:
registersymbol(INJECT)

[DISABLE]

INJECT:
db 89 43 04 D9 EE

unregistersymbol(INJECT)
dealloc(newmem)
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