microsoft excel


On March 16, FortiGuard Labs captured a new Word file that spreads malware by executing malicious VBA (Visual Basic for Applications) code. The sample targeted both Apple Mac OS X and Microsoft Windows systems. We then analyzed the sample, and in this blog we are going to explain how it works, step by step. When the Word file is opened, it shows notifies victims to enable the Macro security option, which allows the malicious VBA code to be executed. Malicious Word File is Opened Figure 1. Asks victim to enable Macro security option Once... [Read More]
by RSS Xiaopeng Zhang & Chris Navarrete  |  Mar 22, 2017  |  Filed in: Security Research
Over the last few years we have received a number of emails with attached Word files that spread malware.  Now it seems that it is becoming more and more popular to spread malware using malicious Excel files. Lately, Fortinet has collected a number of email samples with Excel files attached (.xls, .xlsm) that spread malware by executing malicious VBA (Visual Basic for Applications) code. VBA is a programming language used by Microsoft Office suite. Normally, VBA is used to develop programs for Excel to perform some tasks. I’ll use... [Read More]
by RSS Xiaopeng Zhang  |  Mar 08, 2017  |  Filed in: Security Research
Overview Microsoft Patch Tuesday continues with another FortiGuard vulnerability disclosure, this time affecting Microsoft Excel. For a bit of background on Microsoft Office in general and Office 2007 in particular, check out today's first disclosure. In this case, a memory corruption vulnerability has been discovered in Microsoft Excel 2007. The vulnerability exists due to an error while the vulnerable software attempts to open a specially crafted Excel file. As with the other disclosures today, this vulnerability could lead... [Read More]
by RSS Kai Lu  |  Dec 08, 2015  |  Filed in: Security Research