Stego
XPLOIT
Nested Steam Package
08 Oct 2026
• 1 min read
The challenge is a chain of nested archives ("nested stream package").
Flag
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XploitXβ{n3st3d_cl34n}Solution
The challenge is a chain of nested archives ("nested stream package").
1. Level 1 — CTF_sample_9.zip
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CTF_sample_9.zip
├── CHALLENGE.md → "Nested stream package."
└── nested_package.zip
2. Level 2 — nested_package.zip
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nested_package.zip
├── playlist.txt → the flag
├── preview.mp4 → broken MP4 ("moov atom not found") — decoy
└── nested_stream.dat → another ZIPplaylist.txt contains the flag directly:
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stream0=preview
stream1=nested_stream
XploitXβ{n3st3d_cl34n}
3. Level 3 — nested_stream.dat (ZIP)
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nested_stream.dat
├── decoy1.wav → decoy
├── decoy2.mp4 → decoy
├── final_echo.wav → decoy
└── final_frame.png → decoyThe deeper files are all decoys meant to burn time. The real flag is in
playlist.txt.
n3st3d_cl34n → "nested clean" — the packages nest cleanly until the flag is
found.