![]() ![]() Click “Run” to execute the macro and subsequently watch calculator and a MessageBox popup. This should contain the name of the first cell containing your macro code (in my case the default “R1C1” for row 1, column 1). To test your macro, right click on the first cell containing your macro code and choose “Run”. Click on any cell and enter the formulas “=EXEC(“calc.exe”)”, “=ALERT(“Hello world”)” and “=HALT()” in this cell and the subsequent cells below. This is a special worksheet type in which XLM macros can be entered (a so-called macro sheet). ![]() Select “MS Excel 4.0 Macro” and click “OK”.Ī new worksheet titled “Macro1” has been created. Right click “Sheet1” in the bottom of your screen and click “Insert”.Ī window pops up that allows you to choose from various objects to insert. The following steps can be performed to create an XLM macro in recent versions of Excel:Ĭreate a new Excel workbook. ![]() To give you an idea how old this stuff is: our long lost friend Clippy was not introduced before 1996. The concept of XLM is very different from Visual Basic for Applications (VBA) macros, which were introduced one year later in Excel 5.0. For automation, XLM macros can be used in this version of Excel via so-called macro worksheets. It is 1992 when spreadsheet software Excel 4.0 is released for Windows 3.0 and 3.1. After the presentation, the video and slide material will be published online. This blog post is a teaser for the presentation by Pieter Ceelen and Stan Hegt titled “The MS Office magic show” at Derb圜on 2018 (Sunday, 1 PM). And although the technology is 26 years old by now, Excel 4.0 macros are still supported in the most recent Microsoft Office versions (including Office 2016, at time of writing). However, XLM macros are a hidden gem for red teamers and turn out to be a very good alternative to VBA macros for offensive purposes: XLM can be difficult to analyse and it appears that most antivirus solutions have trouble detecting XLM maldocs. Virtually all malicious macro documents for MS Office are based on Visual Basic for Applications (VBA). If you grew up in the Windows 95 age or later, just as I did, you might have never heard of this technology that was introduced as early as 1992. In this post, I will dive into Excel 4.0 macros (also called XLM macros – not XML) for offensive purposes. ![]()
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