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shmoo

TuT [IDA Tutorial]How to Disable Memory Checks

156 posts in this topic

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When developers make a game, sometimes they include memory checks to make things harder to hack. But what are memory checks? Memory checks are checks to make sure that a certain value, for example, money has been hacked. If it has been hacked, the memory check will kick in and set it back to its original, unhacked value. This is why when you test in iGameGuardian, GDB, LLDB, etc. your hack will not work. But we want our hacks to work, so here is how to disable them :snoop: This is also only an example function :snoop:

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I hope this helped! Also be sure to ask any questions if you have any :)

Edited by shmoo
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let me see (y)

 

e ...

 

0xA99C0 CMP R0, R10 //compare R10 with R0
0xA99C4 BLE 0xA99E8 //branch to 0xA99E8 if it is less than or equal to

 

 

 

if R10 less or eq  R0,then branch to 0xA99E8..

so why you wrote 0xA99F8

 

is it wrong ?

Edited by zzmutu

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let me see (y)

 

e ...

 

0xA99C0 CMP R0, R10 //compare R10 with R0

0xA99C4 BLE 0xA99E8 //branch to 0xA99E8 if it is less than or equal to

 

 

 

if R10 less or eq  R0,then branch to 0xA99E8..

so why you wrote 0xA99F8

 

is it wrong ?

It's not wrong, it should be like that :) 

 

You don't always have to branch to a function, you can also branch directily to offsets. 

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lets see what took you over 1 hour to patch  :wallbash:


cant see any checks but anyway there are 3 ways to do what you want:

rGpKGk8.png

change cost to 0 

change your money on the load 

change the final money

Edited by iOSv64

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lets see what took you over 1 hour to patch :wallbash:

cant see any checks but anyway there are 3 ways to do what you want:

rGpKGk8.png

change cost to 0

change your money on the load

change the final money

Well it took me an hour because I was doing x/i in GDB because my SSH is screwed up, and yeah I knew that. I just wanted to hack the SUB because it was quicker

 

edit: actually, as a challenge for myself I could time myself and see how long it takes me to make the cost 0, thanks for that idea :)

Edited by shmoo
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Well it took me an hour because I was doing x/i in GDB because my SSH is screwed up, and yeah I knew that. I just wanted to hack the SUB because it was quicker

 

edit: actually, as a challenge for myself I could time myself and see how long it takes me to make the cost 0, thanks for that idea :)

there is also a 4th solution , just mov r0 #0 bx lr the whole function ahah

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there is also a 4th solution , just mov r0 #0 bx lr the whole function ahah

Oh yeah I forgot about that, I'm guessing that's how free store was done in FG: Quest for Stuff? (never tried it myself)

 

00207047

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