If the user wanted to, he or she could create a second new macro by starting a new Sub Name() line below the first End Sub. The Sub Name() line tells the editor the start of the macro code. However, these are just best practice guidelines and need not necessarily be adhered to. Since CFI Macro is two words, this should be written as cfiMacro. VBA names generally cannot contain spaces. Note: The general convention for typing names for any macro, function, or variable in VBA is to use lower case if there is only one word, and to use an uppercase letter at the start of every new word. The VBA Editor will automatically add an “End Sub” line a few lines below the “Sub”. For example, to name the macro “CFI Macro”, a user should type “Sub cfiMacro()” and press enter. Pressing enter will automatically fill the window with the general format of an Excel macro. To define a macro name, the user must type Sub name() and press “enter” in the coding window of the editor. The macro name is what the user will use to call the macro into action. This name cannot match other macros, and it usually cannot match the name of other properties, functions, and tools within Excel. To start off, the macro must be given a unique name. Simply type in a new module name and press enter. Optionally, the user can name this module using the properties window in the bottom left corner of the editor. To create a new module, press Insert > Module. To start coding, the user will have to create a Module file. As a summary, pressing Alt + F11 in Excel opens up the VBA window and allows the user to begin coding macros. It was one of the most serious epidemics in Internet history.In a separate article, CFI discusses what VBA is and how to access the VBA Editor. Melissa made history as the first macro virus with email worm trait and started spreading via email on Mainfecting tens of thousands within hours. Macro viruses subsequently became the dominant type of virus. Although some people consider them to be a relic of the late 1990s, they have in fact made a resurgence in recent years, forcing users to be extra vigilant.Ĭoncept was the first macro virus, appearing in July 1995 and targeted Microsoft Word. Macro viruses can be found in several different forms. Regular scans will clean any infected documents and ensure no new computer viruses are downloaded. To remove these viruses, users should rely on security software that provides specific macro virus detection and removal tools. Any program that uses macros can operate as a host, and any copy of an infected program - sent via email, stored on disk or on a USB drive - will contain the virus. In addition, it's important to note that macro viruses are cross-platform they can infect both Windows and Mac computers using the same code. These viruses can also be designed to erase or compromise stored data. Some of these viruses cause abnormalities in text documents, such as missing or inserted words, while others access email accounts and send out copies of infected files to all of a user's contacts, who in turn open and access these files because they come from a trusted source. Once an infected macro is run, all other documents on a user's computer become infected. The main risk of macro viruses is their ability to spread quickly. Unlike Trojans, however, macro viruses can replicate themselves and infect other computers. A macro virus is similar to a Trojan virus, since it may appear benign and users may not immediately notice any ill effects. They are difficult to detect, as they do not operate until an infected macro is run, at which time they perform a series of commands. They may come from documents attached to emails, or the code may be downloaded after clicking on "phishing" links in banner ads or URLs. Macro viruses are most commonly found embedded in documents or inserted as malicious code into word-processing programs. The first macro virus, called Concept, appeared in July 1995 and macro viruses (mostly infecting Word documents) subsequently became the dominant type of virus until the turn of the century, when Microsoft disabled macros by default in Office (versions since Office 2000): since then, cybercriminals have had to try and trick their victims into enabling macros before their infected macro is able to run. Macro viruses add their code to the macros associated with documents, spreadsheets and other data files.
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