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Leveraging PowerShell for Code Execution
- PowerShell can be used to enumerate and exploit a target in many ways, hence techniques to evade and abuse it exist
- This article delves into a Huntress blog post and analyzes PowerShell code implementation intricacies and low-level nuances
- Using a PowerShell v1 target environment helps script execution bypass AMSI and hastens the exploitation process
- The above code snippets shows how to target a registry key and execute the code with Invoke-Expression
- Code-wise, PowerShell script has benefits over C code in things like location of libraries is handled by the system
- System.dll and UnsafeNativeMethods class are used in PowerShell script to link .NET code with unmanaged windows APIs
- Delegate type function plays a vital role in invocation of API functions by malicious actors
- User-mode malware typically involves allocation of memory and passing shellcode in that memory space to execute concurrently
- Conditional logic is added to the code for avoiding newer 64-bit versions of PowerShell with AMSI incorporated
- The article describes the understanding gained from the observation of the TTPs used by threat actors in a PowerShell script
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