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Posted

Hey there,

 

I am trying to understand IDA Game Hacking, but I am not really getting it.

Did read all tutorials like 947845874 times...

 

I think this function is hackable:

bool __cdecl -[CurrencyWallet spendValue:](struct CurrencyWallet *self, SEL, unsigned int)
__text:00071F40 __CurrencyWallet_spendValue__           ; DATA XREF: __objc_const:00DAA128o
__text:00071F40                 PUSH            {R4,R7,LR}
__text:00071F42                 ADD             R7, SP, #4
__text:00071F44                 MOV             R4, R0
__text:00071F46                 MOV             R0, #(_OBJC_IVAR_$_CurrencyWallet._quantity - 0x71F52) ; unsigned int _quantity;
__text:00071F4E                 ADD             R0, PC  ; unsigned int _quantity;
__text:00071F50                 LDR             R0, [R0] ; unsigned int _quantity;
__text:00071F52                 LDR             R1, [R4,R0]
__text:00071F54                 CMP             R1, R2

I though the 'MOV R4, R0' could be hacked or 'PUSH {R4,R7,LR}'

 

I have this problem with like any game, I've no idea what to do...

 

any help?

 

Thanks in advance,

 

:)

Posted

do u see any sub instruction

I see this:

bool __cdecl -[CurrencyWallet spendValue:](struct CurrencyWallet *self, SEL, unsigned int)
__text:00071F40 __CurrencyWallet_spendValue__
__text:00071F40                 PUSH            {R4,R7,LR}
__text:00071F42                 ADD             R7, SP, #4
__text:00071F44                 MOV             R4, R0
__text:00071F46                 MOV             R0, #(_OBJC_IVAR_$_CurrencyWallet._quantity - 0x71F52) ; unsigned int _quantity;
__text:00071F4E                 ADD             R0, PC  ; unsigned int _quantity;
__text:00071F50                 LDR             R0, [R0] ; unsigned int _quantity;
__text:00071F52                 LDR             R1, [R4,R0]
__text:00071F54                 CMP             R1, R2
__text:00071F56                 ITT CC
__text:00071F58                 MOVCC           R0, #0
__text:00071F5A                 POPCC           {R4,R7,PC}
__text:00071F5C                 MOVW            R3, #(:lower16:(selRef_notifyChanges - 0x71F6C))
__text:00071F60                 SUBS            R1, R1, R2
__text:00071F62                 MOVT.W          R3, #(:upper16:(selRef_notifyChanges - 0x71F6C))
__text:00071F66                 STR             R1, [R4,R0]
__text:00071F68                 ADD             R3, PC ; selRef_notifyChanges
__text:00071F6A                 MOV             R0, R4
__text:00071F6C                 LDR             R1, [R3] ; "notifyChanges"
__text:00071F6E                 BLX.W           _objc_msgSend
__text:00071F72                 MOV             R0, #(selRef_persistQuantity - 0x71F7E)
__text:00071F7A                 ADD             R0, PC ; selRef_persistQuantity
__text:00071F7C                 LDR             R1, [R0] ; "persistQuantity"
__text:00071F7E                 MOV             R0, R4
__text:00071F80                 BLX.W           _objc_msgSend
__text:00071F84                 MOVS            R0, #1
__text:00071F86                 POP             {R4,R7,PC}

I assumed that after "__text:00071F56 ITT CC" something else started.. not sure tho...

Posted

I see this:

bool __cdecl -[CurrencyWallet spendValue:](struct CurrencyWallet *self, SEL, unsigned int)
__text:00071F40 __CurrencyWallet_spendValue__
__text:00071F40                 PUSH            {R4,R7,LR}
__text:00071F42                 ADD             R7, SP, #4
__text:00071F44                 MOV             R4, R0
__text:00071F46                 MOV             R0, #(_OBJC_IVAR_$_CurrencyWallet._quantity - 0x71F52) ; unsigned int _quantity;
__text:00071F4E                 ADD             R0, PC  ; unsigned int _quantity;
__text:00071F50                 LDR             R0, [R0] ; unsigned int _quantity;
__text:00071F52                 LDR             R1, [R4,R0]
__text:00071F54                 CMP             R1, R2
__text:00071F56                 ITT CC
__text:00071F58                 MOVCC           R0, #0
__text:00071F5A                 POPCC           {R4,R7,PC}
__text:00071F5C                 MOVW            R3, #(:lower16:(selRef_notifyChanges - 0x71F6C))
__text:00071F60                 SUBS            R1, R1, R2
__text:00071F62                 MOVT.W          R3, #(:upper16:(selRef_notifyChanges - 0x71F6C))
__text:00071F66                 STR             R1, [R4,R0]
__text:00071F68                 ADD             R3, PC ; selRef_notifyChanges
__text:00071F6A                 MOV             R0, R4
__text:00071F6C                 LDR             R1, [R3] ; "notifyChanges"
__text:00071F6E                 BLX.W           _objc_msgSend
__text:00071F72                 MOV             R0, #(selRef_persistQuantity - 0x71F7E)
__text:00071F7A                 ADD             R0, PC ; selRef_persistQuantity
__text:00071F7C                 LDR             R1, [R0] ; "persistQuantity"
__text:00071F7E                 MOV             R0, R4
__text:00071F80                 BLX.W           _objc_msgSend
__text:00071F84                 MOVS            R0, #1
__text:00071F86                 POP             {R4,R7,PC}
I assumed that after "__text:00071F56 ITT CC" something else started.. not sure tho...

 

You can NOP the

sub r1, r1, r2

or just hook the method:

%hook CurrencyWallet
- (bool)spendValue:(unsigned int)value {
   return YES;
}
%end
Posted

 

You can NOP the

sub r1, r1, r2

or just hook the method:

%hook CurrencyWallet
- (bool)spendValue:(unsigned int)value {
   return YES;
}
%end

Hmm not working. Guess the function isn't hackable then?

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