Use strings to look for IP addresses, URLs, or encoded commands.
Use rar2john upm002.rar > hash.txt then run john hash.txt . upm002.rar
If you do not have the password, forensic/CTF analysts typically use: Use strings to look for IP addresses, URLs,
Is it a flag-bearing file for a game? Or a downloader for a remote access trojan (RAT)? upm002.rar
Upload the file to VirusTotal or ANY.RUN to observe its behavior in a safe environment.
Check the "magic bytes." A true RAR file starts with 52 61 72 21 1A 07 (RAR 5.0) or 52 61 72 21 1A 07 00 (RAR 4.x).