BUUCTF: [BJDCTF2020] Seriously, you lose

Title address: https://buuoj.cn/challenges#[BJDCTF2020]%E8%AE%A4%E7%9C%9F%E4%BD%A0%E5%B0%B1%E8%BE%93%E4%BA %86

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binwalktake a look

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