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Adding Microsoft.Workflow.Compiler.exe and payload examples.
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xenoscr
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32
OSBinaries/Microsoft.Wrokflow.Compiler.xml
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32
OSBinaries/Microsoft.Wrokflow.Compiler.xml
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<?xml version="1.0" encoding="utf-8"?>
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<CompilerInput xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.datacontract.org/2004/07/Microsoft.Workflow.Compiler">
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<files xmlns:d2p1="http://schemas.microsoft.com/2003/10/Serialization/Arrays">
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<d2p1:string>Microsoft.Workflow.Compiler.xoml</d2p1:string>
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</files>
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<parameters xmlns:d2p1="http://schemas.datacontract.org/2004/07/System.Workflow.ComponentModel.Compiler">
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<assemblyNames xmlns:d3p1="http://schemas.microsoft.com/2003/10/Serialization/Arrays" xmlns="http://schemas.datacontract.org/2004/07/System.CodeDom.Compiler" />
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<compilerOptions i:nil="true" xmlns="http://schemas.datacontract.org/2004/07/System.CodeDom.Compiler" />
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<coreAssemblyFileName xmlns="http://schemas.datacontract.org/2004/07/System.CodeDom.Compiler"></coreAssemblyFileName>
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<embeddedResources xmlns:d3p1="http://schemas.microsoft.com/2003/10/Serialization/Arrays" xmlns="http://schemas.datacontract.org/2004/07/System.CodeDom.Compiler" />
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<evidence xmlns:d3p1="http://schemas.datacontract.org/2004/07/System.Security.Policy" i:nil="true" xmlns="http://schemas.datacontract.org/2004/07/System.CodeDom.Compiler" />
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<generateExecutable xmlns="http://schemas.datacontract.org/2004/07/System.CodeDom.Compiler">false</generateExecutable>
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<generateInMemory xmlns="http://schemas.datacontract.org/2004/07/System.CodeDom.Compiler">true</generateInMemory>
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<includeDebugInformation xmlns="http://schemas.datacontract.org/2004/07/System.CodeDom.Compiler">false</includeDebugInformation>
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<linkedResources xmlns:d3p1="http://schemas.microsoft.com/2003/10/Serialization/Arrays" xmlns="http://schemas.datacontract.org/2004/07/System.CodeDom.Compiler" />
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<mainClass i:nil="true" xmlns="http://schemas.datacontract.org/2004/07/System.CodeDom.Compiler" />
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<outputName xmlns="http://schemas.datacontract.org/2004/07/System.CodeDom.Compiler"></outputName>
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<tempFiles i:nil="true" xmlns="http://schemas.datacontract.org/2004/07/System.CodeDom.Compiler" />
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<treatWarningsAsErrors xmlns="http://schemas.datacontract.org/2004/07/System.CodeDom.Compiler">false</treatWarningsAsErrors>
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<warningLevel xmlns="http://schemas.datacontract.org/2004/07/System.CodeDom.Compiler">-1</warningLevel>
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<win32Resource i:nil="true" xmlns="http://schemas.datacontract.org/2004/07/System.CodeDom.Compiler" />
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<d2p1:checkTypes>false</d2p1:checkTypes>
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<d2p1:compileWithNoCode>false</d2p1:compileWithNoCode>
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<d2p1:compilerOptions i:nil="true" />
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<d2p1:generateCCU>false</d2p1:generateCCU>
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<d2p1:languageToUse>CSharp</d2p1:languageToUse>
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<d2p1:libraryPaths xmlns:d3p1="http://schemas.microsoft.com/2003/10/Serialization/Arrays" i:nil="true" />
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<d2p1:localAssembly xmlns:d3p1="http://schemas.datacontract.org/2004/07/System.Reflection" i:nil="true" />
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<d2p1:mtInfo i:nil="true" />
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<d2p1:userCodeCCUs xmlns:d3p1="http://schemas.datacontract.org/2004/07/System.CodeDom" i:nil="true" />
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</parameters>
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</CompilerInput>
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10
OSBinaries/Microsoft.Wrokflow.Compiler.xoml
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10
OSBinaries/Microsoft.Wrokflow.Compiler.xoml
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<SequentialWorkflowActivity x:Class="MyWorkflow" x:Name="MyWorkflow" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/workflow">
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<CodeActivity x:Name="codeActivity1" />
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<x:Code><![CDATA[
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public class Foo : SequentialWorkflowActivity {
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public Foo() {
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Console.WriteLine("FOOO!!!!");
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}
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}
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]]></x:Code>
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</SequentialWorkflowActivity>
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64
yml/OSBinaries/Microsoft.Workflow.Compiler.yml
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64
yml/OSBinaries/Microsoft.Workflow.Compiler.yml
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---
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Name: Microsoft.Workflow.Compiler.exe
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Description: A utility included with .NET that is capable of compiling and executing C# or VB.net code.
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Author: 'Conor Richard'
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Created: '2018-10-22'
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Commands:
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- Command: Microsoft.Worflow.Compiler.exe tests.xml results.xml
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Description: Compile and execute C# or VB.net code in a XOML file referenced in the test.xml file.
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Usecase: Compile and run code
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Category: Execution
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Privileges: User
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MitreID: T1127
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MitreLink: https://attack.mitre.org/wiki/Technique/T1127
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OperatingSystem: Windows 10S
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- Command: Microsoft.Worflow.Compiler.exe tests.txt results.txt
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Description: Compile and execute C# or VB.net code in a XOML file referenced in the test.txt file.
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Usecase: Compile and run code
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Category: Execution
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Privileges: User
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MitreID: T1127
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MitreLink: https://attack.mitre.org/wiki/Technique/T1127
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OperatingSystem: Windows 10S
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- Command: Microsoft.Worflow.Compiler.exe tests.xml results.xml
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Description: Compile and execute C# or VB.net code in a XOML file referenced in the test.xml file.
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Usecase: Compile and run code
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Category: AWL Bypass
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Privileges: User
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MitreID: T1127
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MitreLink: https://attack.mitre.org/wiki/Technique/T1127
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OperatingSystem: Windows 10S
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- Command: Microsoft.Worflow.Compiler.exe tests.txt results.txt
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Description: Compile and execute C# or VB.net code in a XOML file referenced in the test.txt file.
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Usecase: Compile and run code
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Category: AWL Bypass
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Privileges: User
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MitreID: T1127
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MitreLink: https://attack.mitre.org/wiki/Technique/T1127
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OperatingSystem: Windows 10S
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Full Path:
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- Path: C:\Windows\Microsoft.Net\Framework64\v4.0.30319\Microsoft.Workflow.Compiler.exe
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Code Sample:
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- Code:
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Detection:
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- IOC: Microsoft.Workflow.Compiler.exe would not normally be run on workstations.
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- IOC: The presence of csc.exe or vbc.exe as child processes of Microsoft.Workflow.Compiler.exe
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- IOC: Presence of "<CompilerInput" in a text file.
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Resources:
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- Link: https://twitter.com/mattifestation/status/1030445200475185154
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- Link: https://posts.specterops.io/arbitrary-unsigned-code-execution-vector-in-microsoft-workflow-compiler-exe-3d9294bc5efb
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- Link: https://gist.github.com/mattifestation/3e28d391adbd7fe3e0c722a107a25aba#file-workflowcompilerdetectiontests-ps1
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- Link: https://gist.github.com/mattifestation/7ba8fc8f724600a9f525714c9cf767fd#file-createcompilerinputxml-ps1
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- Link: https://www.forcepoint.com/blog/security-labs/using-c-post-powershell-attacks
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- Link: https://www.fortynorthsecurity.com/microsoft-workflow-compiler-exe-veil-and-cobalt-strike/
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- Link: https://medium.com/@Bank_Security/undetectable-c-c-reverse-shells-fab4c0ec4f15
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Acknowledgement:
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- Person: Matt Graeber
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Handle: '@mattifestation'
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- Person: John Bergbom
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Handle: '@BergbomJohn'
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- Person: FortyNorth Security
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Handle: '@FortyNorthSec'
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- Person: Bank Security
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Handle: '@Bank_Security'
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---
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