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flag 파일을 upx를 이용해 언패킹 후 리버싱을 하면 된다.

Mac UPX 설치법

brew install upx

0000000000496620         db  0x01 ; '.'

0000000000496621         db  0x00 ; '.'

0000000000496622         db  0x02 ; '.'

0000000000496623         db  0x00 ; '.'

0000000000496624         db  0x00 ; '.'

0000000000496625         db  0x00 ; '.'

0000000000496626         db  0x00 ; '.'

0000000000496627         db  0x00 ; '.'

0000000000496628         db  0x55 ; 'U'                                         ; DATA XREF=flag

0000000000496629         db  0x50 ; 'P'

000000000049662a         db  0x58 ; 'X'

000000000049662b         db  0x2e ; '.'

000000000049662c         db  0x2e ; '.'

000000000049662d         db  0x2e ; '.'

000000000049662e         db  0x3f ; '?'

000000000049662f         db  0x20 ; ' '

0000000000496630         db  0x73 ; 's'

0000000000496631         db  0x6f ; 'o'

0000000000496632         db  0x75 ; 'u'

0000000000496633         db  0x6e ; 'n'

0000000000496634         db  0x64 ; 'd'

0000000000496635         db  0x73 ; 's'

0000000000496636         db  0x20 ; ' '

0000000000496637         db  0x6c ; 'l'

0000000000496638         db  0x69 ; 'i'

0000000000496639         db  0x6b ; 'k'

000000000049663a         db  0x65 ; 'e'

000000000049663b         db  0x20 ; ' '

000000000049663c         db  0x61 ; 'a'

000000000049663d         db  0x20 ; ' '

000000000049663e         db  0x64 ; 'd'

000000000049663f         db  0x65 ; 'e'

0000000000496640         db  0x6c ; 'l'

0000000000496641         db  0x69 ; 'i'

0000000000496642         db  0x76 ; 'v'

0000000000496643         db  0x65 ; 'e'

0000000000496644         db  0x72 ; 'r'

0000000000496645         db  0x79 ; 'y'

0000000000496646         db  0x20 ; ' '

0000000000496647         db  0x73 ; 's'

0000000000496648         db  0x65 ; 'e'

0000000000496649         db  0x72 ; 'r'

000000000049664a         db  0x76 ; 'v'

000000000049664b         db  0x69 ; 'i'

000000000049664c         db  0x63 ; 'c'

000000000049664d         db  0x65 ; 'e'

000000000049664e         db  0x20 ; ' '

000000000049664f         db  0x3a ; ':'

0000000000496650         db  0x29 ; ')'

0000000000496651         db  0x00 ; '.'

0000000000496652         db  0x00 ; '.'

0000000000496653         db  0x00 ; '.'

0000000000496654         db  0x00 ; '.'

0000000000496655         db  0x00 ; '.'

0000000000496656         db  0x00 ; '.'

0000000000496657         db  0x00 ; '.'

UPX…? sounds like a delivery service :)

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