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shmoo

Guide [Breaking Security]How to disable syscall (anti-debugging protection)

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I made this tutorial in April of 2015 for the cheaters here and after almost a year of it being private I decided to post it to the public.

 

Gameloft always uses syscall on their games, and while this was written in April, MC5 still has removable syscall and you can use MC5 to practice :)

 

Requirements:

- IDA Pro

- Modern Combat 5

- GNU Debugger from cydia.radare.org (repo)

- OpenSSH

- Clutch 1.4.7-2

- armv7 binary of MC5, crack it on a 32 bit device for it to be armv7. I won't post one here because of copyright issues.

 

Below this line is the exact text I wrote on April 10, 2015. Enjoy :)

 

------

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Proof: (me attaching to Modern Combat 5 in GDB)

 

xrLa6qY.jpg

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Thanks for sharing ! ;)


One question.

when the app do not use _syscall what it could be ?

i searched for all methods that check if they had Cydia or etc.

 

Thanks.

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how much mc5 kids show here after that :smoke:

Edited by Shisui11

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how much mc5 kids show here after that :smoke:

they'll think its a hack :rofl:

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Thanks for sharing ! ;)

One question.

when the app do not use _syscall what it could be ?

i searched for all methods that check if they had Cydia or etc.

 

Thanks.

 

It's ptrace. Try searching imports for ptrace

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