: Use a Python script or a bash loop to extract until no more archives remain.
Once you reach the final file (e.g., 20.7z or a flag.txt inside it), the flag is rarely in plain text. Common obfuscations include: 11-20.7z
: If you see a string ending in = , it's likely Base64. : Use a Python script or a bash
import subprocess import os filename = "11-20.7z" while True: # Attempt to extract. -p can be used if there's a known password. result = subprocess.run(["7z", "x", filename, "-y"], capture_output=True) # Logic to find the next .7z file in the directory next_files = [f for f in os.listdir('.') if f.endswith('.7z') and f != filename] if not next_files: break filename = next_files[0] print(f"Extracted: filename") Use code with caution. Copied to clipboard import subprocess import os filename = "11-20
Many "nested zip" challenges use a pattern where the filename itself is the key.