1. Check the .exe file $ file i\ am\ a\ code\ with\ some\ impurities.exe i am a code with some impurities.exe: UTF-8 Unicode (with BOM) text, with CRLF line terminators2. Open the .exe file in any editor.3. Google the piece of code from the file.4. Find out that it is a G2 language for machines.5. Find where we can execute the code: https://ncviewer.com/ https://nraynaud.github.io/webgcode/6. See that the result is similar to binary code, but it's difficult to read.7. Clear the code: remove #, $.8. Execute the clear code.9. Now we see binary code: 00100011 00100100 01011111 00101011 01100110 01000000 01111000 00100110 01011111 01100011 01110110 01101001 00100101 01000000 01101000 01100010 01110110 00100011 0110100010.Convert it to string: #$_+f@x&_cvi%@hbv#h11. Pass the string to the executable "useme". Program does not return anything, but before the return from function: .text:00005574CADB5577 call _Z5usemeNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE12. Now we can see the converted string: n0_g1rl5_d3p4rtm3ntFlag: VishwaCTF{n0_g1rl5_d3p4rtm3nt}.