Walk ... binWalk
```
binwalk -e interesting_waves.png
unzip _interesting_waves.png/11150.zip
```
a password is required
```
zip2john 11150.zip > 11150.zip.hash
john 11150.zip.hash --wordlist=/usr/share/wordlists/rockyou.txt
```
password is: letmein!
```
unzip -P letmein! 11150.zip
cat Flag/flag.txt
KCTF{BiNw4lk_is_h3lpfUl}
```