EBCTF 2013 Quals For100 Writeup

Just do as description

rev(steg.unhideBin(unhex(rot13(un7z(carve(xor(unhex(rot13(unrar(ebCTF_Teaser_FOR100.rar))))))))))

  • unrar and un7z needs the password, got it(12 for unrar, 21 for un7z) by brute forcing.
  • xor refers to XOR cipher using 1 byte key. got it(chr(66)) by brute forcing.
  • carve the 7z file concatenated to a png file
  • steg.unhideBin was found in RobinDavid / LSB-Steganography

Flag