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DarkCTF 2020: Rev/strings

DarkCTF 2020: Rev/strings


363 points

Description:Just manipulation of couple of strings....
Note: Enclose the final output inside darkCTF{} File


I used the ghidra to do the initial analysis. Looks like binary takes the input (do nothing with it;)), then calculate some string (I assumed it's a flag) and exit.

Let's try to debug...

gdb ./strings
break _exit

Then dumped the memory before program exit.

Ok, let’s examine the memory dump…

Oh?! What’s that? Is it a flag? Bingo! ;-)