How can we use these attributes to our advantage when writing shellcode? Well, let's think for a second, the instruction takes only one operand, therefore, since it is a very common instruction, it will generate only two bytes in our final shellcode. It multiplies whatever is passed to it by the value stored in %eax, and stores the value in both %edx and %eax, completely overwriting the contents of both registers, regardless of whether it is necessary to do so, in order to store the result of the multiplication...
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Let's put on our mathematician hats for a second, and consider this, what is the only possible result of a multiplication by 0? The answer, as you may have guessed, is 0. I think it's about time for some example code, so here it is: xorl %ecx,%ecx mul %ecx What is this shellcode doing? Well, it 0's out the %ecx register using the xor instruction, so we now know that %ecx is 0...
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able children This will not only help maintain our nations standing as the world economic leader but is vital for our nations survival in this fast paced world.	1 / 279
importance of technical writing Getting a better grasp on how to do this style of writing can help to prevent a lot of extra work. An example of a bad experience I have had with a technical document was last semester in my digital applications class, where for one of the homework assignments, we had to consult datasheets to obtain the equations for doing the problems...	3 / 825
Internet-based instruction: a national survey of psychology faculty ? Statistical Data Included The faculty felt that Internet instruction was positive, and that it was an effective learning mechanism. The author finds it important to note that the specific uses of this technology are relatively basic (e...	2 / 458
Advanced Shellcoding Techniques How can we use these attributes to our advantage when writing shellcode? Well, let's think for a second, the instruction takes only one operand, therefore, since it is a very common instruction, it will generate only two bytes in our final shellcode...	5 / 1249
BSS Exploit Example calling Dont_Think_So() function within run time. main.c == the program we are exploiting which i posted on this site admin@box:~$ gcc main.c -o main admin@box:~$ admin@box:~$ nm main 08048434 T Dont_Think_So shellcode admin@box:~$ export SHELLCODE=`perl -e 'print "\x90"x20;'``cat shellcode` admin@box:~$ We now use something what gets the offset of an environment which is #include main (int argc, char *argv[]) { char *addr; if (argc	1 / 64
Caculating Offsets The position held by the later is direct e.g. the memory location referenced may contain 401036h which would be the exact position that you would call, not relative to the position of the call...	4 / 884
pentium arcitecture CS, DS, SS, ES, FS, GS. They hold up to 16-bit segment selectors. A segment selector is a special pointer that identifies a segment in memory. ? To access a particular segment in memory the segment selector for that segment must be present in the appropriate segment register...	6 / 1527