4/7/2024 0 Comments Excel macros![]() Furthermore, XLM worksheets (.XLS) files don’t have VBA macro code, therefore, detection under Windows Antimalware Scan Interface (AMSI) will fail. XLM can be difficult to analyze, and it appears that most antivirus solutions have trouble detecting XLM laden malicious documents. Predating VBA, XLM macros are highly useful in offensive operations as a means of downloading and invoking the next stage of the attack - usually a DLL or executable. Excel 4.0 macros use formulas in various cells to execute code, top down, left to right, and most likely located in hidden worksheets. Originally introduced in 1992, Excel 4.0 macros are the precursor to Visual Basic for Applications (VBA), a legacy feature incorporated in Microsoft Excel for backward compatibility reasons. This article, part 3, discusses how attackers use Excel 4.0 macros (XLM) to gain a foothold into a network and establish persistence. Part 2 covered Symbolic Link (SYLK) files. In part 1 of the series, we covered injecting macros from a remote Word template. This is the third article in a three part series designed to show various old school techniques regaining popularity that adversaries can use to subvert Microsoft Office documents for nefarious purposes. ![]() Going Old School with Excel 4.0 Macros (XLM) Malicious Office Documents Series, Part 3 of 3 ![]()
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