Easy Rev

Description

Reverse Easy.....

Solution

First we execute the binary

$ ./baby_re_2
Looking for the flag?
Enter the key: test
Wrong! Try Again ...

We try to analyze a binary to find the key using ghidra. We look up FUN_00101277 function and we see some interest. enter image description here First we look at line 19 we show a condition that will execute another function. And we see local_20 is an input variable and local_14 variable that equal = 0x140685(Hex). Since the integer variable is readed as decimal so we try to convert the value of local_14 to Decimal. 140685 (Hex) = 1312389 (Decimal)

So we found the key and we try to execute again

$ ./baby_re_2
Looking for the flag?
Enter the key: 1312389
GrabCON{y0u_g0t_it_8bb31}

We got flag!