reverseeasy
Exatlon
hackthebox
Task: UPX-packed ELF binary that validates a password. Solution: Unpack with upx -d, find space-separated numbers in strings, decode by dividing each by 16 (reverse left shift by 4 bits).
$ ls tags/ techniques/
upx_unpackingstring_analysisarithmetic_decodingleft_shift_reversal
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