Microcorruption: Level 1 - new orleans

So this is the beginning of the Microcorruption CTF. It’s a embedded reverse engineering minigame. Please complete the Tutorial if you haven’t already before reading this. I recommend you read the lock manual as well. This will give you a basic understanding of LockIT and MSP430 Assembly.

DISCLAIMER: I’m really not an expert at reverse engineering/ assembly. If you notice a error on my behalf please tell me.

Lets begin

This level is very easy and can be solved in two different ways.
 
1) Check_password Function
First method is by analysing the check password function. Here we can see the compare being used between register r13 (your input) and memory address 0x2400. Going to the memory address reveals the password.



























2) Create_Password Function
 
In the previous method the password was found in memory, this method shows us that the password was actually hard-coded into the assembly and written to memory address 0x2400. 

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The first instruction of the function moves r15 to the memory address. The remaining functions write the hardcoded password in. If your new, the hardcoded password is written in hex and highlighted in the yellow box.
 
Password: [mHub71