Analysts often find a C2 (Command & Control) IP address embedded in a config file.
Use tools like file or strings to check for suspicious text. WinblowsEkspee.zip
Check for NTFS Alternate Data Streams (ADS) if the challenge provides a raw disk image. To give you a more specific answer, could you tell me: Which platform or CTF is this from? Analysts often find a C2 (Command & Control)
Locate specific keys that indicate persistence or system modification. WinblowsEkspee.zip