If you are analyzing this file as part of a technical challenge, follow these standard investigative steps: Command: file Litt.rar
If the RAR contains images, use StegSolve or steghide to check for hidden data within the pixels. Litt.rar
If prompted for a password and you don't have one, use a wordlist like rockyou.txt with John the Ripper: If you are analyzing this file as part