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I am doing TryHackMe REloaded room, level 3.
When I got stuck I followed this tutorial which mentions an XOR by 7 operation being performed on a string, however I cannot see it anywhere.
Where is it happening in the below image from IDA Free?
The call highlighted in yellow above:
This is not a CTF. It's called how to kill someone else's time. You didn't even bother to read your tutorial carefully.
Moreover, the pictures you provided don't say anything. As correctly noted in the comments - without the file itself being investigated - this is just a waste of time.
Here's another picture for you
