PrivescCheck

by itm4n

Privilege Escalation Enumeration Script for Windows

610 Stars 127 Forks Last release: Not found BSD 3-Clause "New" or "Revised" License 48 Commits 0 Releases

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PrivescCheck

This script aims to enumerate common Windows security misconfigurations which can be leveraged for privilege escalation and gather various information which might be useful for exploitation and/or post-exploitation.

I built on the amazing work done by @harmj0y and @mattifestation in PowerUp. I added more checks and also tried to reduce the amount of false positives.

Usage

By default, the script runs only "quick-win" checks. To get extra information, use the option

-Extended
.

From a PowerShell prompt:

PS C:\Temp\> Set-ExecutionPolicy Bypass -Scope process -Force
PS C:\Temp\> . .\Invoke-PrivescCheck.ps1; Invoke-PrivescCheck 
PS C:\Temp\> . .\Invoke-PrivescCheck.ps1; Invoke-PrivescCheck -Extended

From a PowerShell prompt + Log results to a file:

PS C:\Temp\> Set-ExecutionPolicy Bypass -Scope process -Force
PS C:\Temp\> . .\Invoke-PrivescCheck.ps1; Invoke-PrivescCheck | Tee-Object "result.txt"
PS C:\Temp\> . .\Invoke-PrivescCheck.ps1; Invoke-PrivescCheck -Extended | Tee-Object "result.txt"

From a command prompt + Log results to a file:

C:\Temp\>powershell -ep bypass -c ". .\Invoke-PrivescCheck.ps1; Invoke-PrivescCheck | Tee-Object result.txt"
C:\Temp\>powershell -ep bypass -c ". .\Invoke-PrivescCheck.ps1; Invoke-PrivescCheck -Extended | Tee-Object result.txt"

Yet another Windows Privilege escalation tool, why?

I really like PowerUp because it can enumerate common vulnerabilities very quickly and without using any third-party tools. The problem is that it hasn't been updated for several years now. The other issue I spotted quite a few times over the years is that it sometimes returns false positives which are quite confusing.

Other tools exist on GitHub but they are not as complete or they have too many dependencies. For example, they rely on WMI calls or other command outputs.

Therefore, I decided to make my own script with the following constraints in mind:

  • It must not use third-party tools such as

    accesschk.exe
    from SysInternals.
  • It must not use built-in Windows commands such as

    whoami.exe
    or
    netstat.exe
    . The reason for this is that I want my script to be able to run in environments where AppLocker (or any other Application Whitelisting solution) is enforced.
  • It must not use built-in Windows tools such as

    sc.exe
    or
    tasklist.exe
    because you'll often get an Access denied error if you try to use them from WinRM for example.
  • It must not use WMI because its usage can be restricted to admin-only users.

  • Last but not least, it must be compatible with PowerShell Version 2.

Addressing all the constraints...

  • Third-party tools

I have no merit, I reused some of the code made by @harmj0y and @mattifestation. Indeed, PowerUp has a very powerfull function called

Get-ModifiablePath
which checks the ACL of a given file path to see if the current user has write permissions on the file or folder. I modified this function a bit to avoid some false positives though. Before that a service command line argument such as
/svc
could be identified as a vulnerable path because it was interpreted as
C:\svc
. My other contribution is that I made a registry-compatible version of this function (
Get-ModifiableRegistryPath
).
  • Windows built-in windows commands/tools

When possible, I naturally replaced them with built-in PowerShell commands such as

Get-Process
. In other cases, such as
netstat.exe
, you won't get as much information as you would with basic PowerShell commands. For example, with PowerShell, TCP/UDP listeners can easily be listed but there is no easy way to get the associated Process ID. In this case, I had to invoke Windows API functions.
  • WMI

You can get a looooot of information through WMI, that's great! But, if you face a properly hardened machine, the access to this interface will be restricted. So, I had to find workarounds. And here comes the Registry! Common checks are based on some registry keys but it has a lot more to offer. The best example is services. You can get all the information you need about every single service (except their current state obviously) simply by browsing the registry. This is a huge advantage compared to

sc.exe
or
Get-Service
which depend on the access to the Service Control Manager.
  • PowerShellv2 support

This wasn't that easy because newer version of PowerShell have very convenient functions or options. For example, the

Get-LocalGroup
function doesn't exist and
Get-ChildItem
doesn't have the
-Depth
option in PowerShellv2. So, you have to work your way around each one of these small but time-consuming issues.

Features

Current User

Invoke-UserCheck - Gets the usernane and SID of the current user
Invoke-UserGroupsCheck - Enumerates groups the current user belongs to except default and low-privileged ones
Invoke-UserPrivilegesCheck - Enumerates the high potential privileges of the current user's token
Invoke-UserEnvCheck - Checks for sensitive data in environment variables

Services

Invoke-InstalledServicesCheck - Enumerates non-default services
Invoke-ServicesPermissionsCheck - Enumerates the services the current user can modify through the service control manager
Invoke-ServicesPermissionsRegistryCheck - Enumerates services that can be modified by the current user in the registry
Invoke-ServicesImagePermissionsCheck - Enumerates all the services that have a modifiable binary (or argument)
Invoke-ServicesUnquotedPathCheck - Enumerates services with an unquoted path that can be exploited
Invoke-DllHijackingCheck - Checks whether any of the system path folders is modifiable
Invoke-HijackableDllsCheck - Lists hijackable DLLs depending on the version of the OS

Programs

Invoke-InstalledProgramsCheck - Enumerates the applications that are not installed by default
Invoke-ModifiableProgramsCheck - Enumerates applications which have a modifiable EXE of DLL file
Invoke-ProgramDataCheck - Checks for modifiable files and folders under non default ProgramData folders
Invoke-ApplicationsOnStartupCheck - Enumerates the applications which are run on startup
Invoke-RunningProcessCheck - Enumerates the running processes
Invoke-ScheduledTasksCheck - Enumrates scheduled tasks with a modifiable path

Credentials

Invoke-SamBackupFilesCheck - Checks common locations for the SAM/SYSTEM backup files
Invoke-UnattendFilesCheck - Enumerates Unattend files and extracts credentials 
Invoke-WinlogonCheck - Checks credentials stored in the Winlogon registry key
Invoke-CredentialFilesCheck - Lists the Credential files that are stored in the current user AppData folders
Invoke-VaultCredCheck - Enumerates credentials saved in the Credential Manager
Invoke-VaultListCheck - Enumerates web credentials saved in the Credential Manager
Invoke-GPPPasswordCheck - Lists Group Policy Preferences (GPP) containing a non-empty "cpassword" field

Hardening

Invoke-UacCheck - Checks whether UAC (User Access Control) is enabled
Invoke-LapsCheck - Checks whether LAPS (Local Admin Password Solution) is enabled
Invoke-PowershellTranscriptionCheck - Checks whether PowerShell Transcription is configured/enabled
Invoke-LsaProtectionsCheck - Checks whether LSASS is running as a Protected Process (+ additional checks)
Invoke-BitlockerCheck - Checks whether BitLocker is enabled on the system drive

Configuration

Invoke-RegistryAlwaysInstallElevatedCheck - Checks whether the AlwaysInstallElevated key is set in the registry
Invoke-WsusConfigCheck - Checks whether the WSUS is enabled and vulnerable (Wsuxploit)

Network

Invoke-TcpEndpointsCheck - Enumerates unusual TCP endpoints on the local machine (IPv4 and IPv6)
Invoke-UdpEndpointsCheck - Enumerates unusual UDP endpoints on the local machine (IPv4 and IPv6)
Invoke-WlanProfilesCheck - Enumerates the saved Wifi profiles and extract the cleartext key/passphrase when applicable

Updates

Invoke-WindowsUpdateCheck - Checks the last update time of the machine
Invoke-HotfixCheck - Gets a list of installed updates and hotfixes
Invoke-HotfixVulnCheck - Checks whether hotfixes have been installed in the past 31 days

Misc

Invoke-EndpointProtectionCheck - Gets a list of security software products
Invoke-SystemInfoCheck - Gets the name of the operating system and the full version string
Invoke-LocalAdminGroupCheck - Enumerates the members of the default local admin group
Invoke-UsersHomeFolderCheck - Enumerates the local user home folders
Invoke-MachineRoleCheck - Gets the role of the machine (workstation, server, domain controller)
Invoke-SystemStartupHistoryCheck - Gets a list of system startup events 
Invoke-SystemStartupCheck - Gets the last system startup time
Invoke-SystemDrivesCheck - Gets a list of local drives and network shares that are currently mapped

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