│ Category: Forensics
│ Author: Imattas aka Zemi
│ Flag: byuctf{00p5_4ll_b4ckd00r5_139874}
│ Source Path: forensics/wimdows/README.md#wimdows-5
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--[ Challenge Description ]--
-- text --
This challenge uses the same files as for Wimdows 1.
Last but not least, the attacker put another backdoor in the machine to give themself SYSTEM privileges... what was it? (your answer will be found directly in `byuctf{}` format)
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--[ Provided Materials ]--
- Repository folder
https://github.com/BYU-CSA/BYUCTF-2025/tree/main/forensics/wimdows
- forensics/wimdows/README.md
https://github.com/BYU-CSA/BYUCTF-2025/blob/main/forensics/wimdows/README.md
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--[ Recon / Initial Analysis ]--
This page imports the BYUCTF 2025 source material for the Forensics challenge
Wimdows 5. The prompt is kept separate from the solve notes, and upstream
artifacts are linked so the challenge can be replayed from the original
repository.
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--[ Vulnerability / Observation ]--
The useful observation comes from the imported solve notes below. I kept the
original technical path intact while normalizing the page metadata, challenge
grouping, and author attribution for the Volume 2 writeup archive.
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--[ Exploitation / Solution ]--
Source: forensics/wimdows/README.md https://github.com/BYU-CSA/BYUCTF-2025/blob/
main/forensics/wimdows/README.md#wimdows-5
The backdoor is in the sticky keys feature. In Sysmon logs, there's a registry
modification event where you can see that the sticky keys registry key is
modified to spawn cmd.exe with a comment at the end containing the flag.
Flag - byuctf{00p5_4ll_b4ckd00r5_139874}
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--[ Full Exploit Script ]--
No standalone exploit script was present in the selected source material.
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--[ Key Takeaways ]--
- The BYUCTF 2025 challenge material is preserved with local archive formatting.
- The page author is normalized to Imattas aka Zemi.
- The source repository remains linked for handouts, services, and solve
artifacts.