$ cat writeup.md…
$ cat writeup.md…
tjctf
Task: a 6480-byte file identified as 'data' — each byte was shifted by +0x1d (ROT-29), hiding a UPX-packed ELF with an obfuscated bash script containing a multi-layer encoded flag. Solution: byte frequency analysis to find the rotation offset, UPX unpacking, bash deobfuscation, then base64+gzip+base64 decoding to recover the flag.
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