$ cat writeup.md…
$ cat writeup.md…
spbctf
Task: statically-linked ELF packed with UPX 3.96 that refuses to unpack (NotPackedException). Solution: the UPX! magic bytes were replaced with the ASCII 'magic word' 2021; restore all occurrences (l_info header AND both tail PackHeader magics), then upx -d and read the flag from the unpacked binary.
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$sign in$ grep --similar