$ cat writeup.md…
$ cat writeup.md…
hackthebox
Task: recover three project files encrypted by a UPX-packed x86-64 ransomware implementing a timestamp-derived Hill cipher and XOR layer. Solution: reverse the key schedule, invert its 2x2 matrix modulo 256, undo XOR, and truncate each plaintext to its stored length.
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$sign in$ grep --similar