Use Process Hacker or Sysinternals Process Monitor to see if it creates new files, modifies the registry, or injects code into other processes.
Since does not appear to be a known public file from a major competition (like a CTF) or a documented malware sample, a "write-up" for it would typically follow a standard technical analysis template. DA76N8MK0L1.rar
If the contents are executable, observe what they do when run. Use Process Hacker or Sysinternals Process Monitor to