Exploit Research and Development Megaprimer: Eliminating the Bad Characters in Shellcode

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Exploit Research and Development Megaprimer
http://opensecurity.in/exploit-research-and-development-megaprimer/

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Exploit Research and Development Megaprimer: Eliminating the Bad Characters in Shellcode

  1. 1. EXPLOIT RESEARCH ELIMINATING BAD CHARACTERS KERALA CYBER FORCE WWW.KERALACYBERFORCE.IN AJIN ABRAHAM @ajinabraham
  2. 2. @ajinabraham ELIMINATING BAD CHARACTERS • Bad characters are those unwanted characters that can break your shellcode. • We can use !mona bytearray to generate bytes from 0x00 – 0xFF. • Insert the pattern into the buffer and find out which one is breaking the shellcode • Mark it as a bad character and re-insert pattern excluding that bad character till all the bad characters are eliminated. • Create your shellcode excluding the bad characters. • That’s It.
  3. 3. @ajinabraham SOME COMMON BAD CHARACTERS • 00 – NULL • 0A – Line feed n • 0D –Carriage return r • FF – Form Feed f Thanks @ajinabraham

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