Tutorial Crack Me v1.0 - [Medium Difficulty]

[ofelyaa 32 iPhone 8 16.7.4]

Oh god I loved them crackme on PC when I was young gotta redo that on iOS definitely lol

I am posting to keep track of the thread and sole existence of the crackme on iOS~ and to say thank you!

[GameGoOut 0 iPhone 12 Pro 15.4]

Nice! Thanks Bor

[lxdx 26.3k iPhone 14 18.1]

On 11/5/2024 at 9:55 AM, ios_noob_roblox said:

Since I'm new to iOS reverse engineering it took me a couple of hours to crack this app. I don't know swift nor objective-c so it was frustrating but in the end a fun challenge for me. 

 

Observations

During my initial analysis, I identified some key strings related to license verification (found using a debugger):

• 0x102284878: "The license code must be 10 digits"
• 0x102284A20: "Oops! A license is needed"
• 0x102284C5C: "The license code is invalid"
• 0x102284AD4: Success message location

 

Steps to Crack the App

I’ll modify the instruction at 0x1022846A4 to redirect any conditions to the success message.

Original Instructions:

• 0x1022846A4: 80 10 00 B4

Patched Instructions:

• 0x1022846A4: 07 01 00 14 — Modified instruction to forcefully jump to the success message

Replace the original bytes with the patched ones in a hex editor, or use your debugger to make the change directly.

 

Proof: 

https://imgur.com/a/we9agFi

Wowww nice done mate !!!

Really impressive, which debugger did you use ? lldb?

[ios_noob_roblox 4 iPhone 17 Pro 26.4]

On 11/26/2024 at 1:28 PM, 𓄼 . f v c k . 𓄹 said:

Wowww nice done mate !!!

Really impressive, which debugger did you use ? lldb?

I used lldb and IDA PRO debugger 

[Xpoo 902 iPhone 7 Plus 11.3.1]

thank you

[lxdx 26.3k iPhone 14 18.1]

On 12/3/2024 at 2:45 AM, ios_noob_roblox said:

I used lldb and IDA PRO debugger 

iDA Pro debugger on jailed ??

[Rocedu13700 7]

Mérite bien que sa 

[tuananh7280 0]

thanks

[Kotegawa 0 iPhone 7]

Thanks

[Eric6666 4 iPhone 7 13.1.2]

Wow