2018-10-25 04:48:45 +02:00
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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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2021-01-10 16:04:52 +01:00
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Created: 2018-10-22
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2018-10-25 04:48:45 +02:00
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Commands:
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2019-01-28 17:39:23 +01:00
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- Command: Microsoft.Workflow.Compiler.exe tests.xml results.xml
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2018-10-25 04:48:45 +02:00
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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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2018-12-10 14:28:12 +01:00
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Category: Execute
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2018-10-25 04:48:45 +02:00
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Privileges: User
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MitreID: T1127
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2018-10-25 21:24:55 +02:00
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OperatingSystem: Windows 10S
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2019-01-28 17:39:23 +01:00
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- Command: Microsoft.Workflow.Compiler.exe tests.txt results.txt
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2018-10-25 04:48:45 +02:00
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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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2018-10-25 21:24:55 +02:00
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Category: Execute
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2018-10-25 04:48:45 +02:00
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Privileges: User
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MitreID: T1127
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2021-01-10 16:04:52 +01:00
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OperatingSystem: Windows 10S
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2019-01-28 17:39:23 +01:00
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- Command: Microsoft.Workflow.Compiler.exe tests.txt results.txt
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2018-10-25 04:48:45 +02:00
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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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2021-01-10 16:04:52 +01:00
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OperatingSystem: Windows 10S
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2018-12-10 14:28:12 +01:00
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Full_Path:
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2018-10-25 21:24:55 +02:00
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- Path: C:\Windows\Microsoft.Net\Framework64\v4.0.30319\Microsoft.Workflow.Compiler.exe
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2021-01-10 16:04:52 +01:00
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Code_Sample:
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2018-10-25 04:48:45 +02:00
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- Code:
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2018-10-25 21:24:55 +02:00
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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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2018-10-25 04:48:45 +02:00
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Resources:
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2018-10-25 21:24:55 +02:00
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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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2018-10-25 04:48:45 +02:00
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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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2021-01-10 16:04:52 +01:00
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---
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