Macro virus

Macro virus macro (Macro): A set of commands designed to avoid repeated operations.
When opening the file, first execute the "macro" and then load the file content. Therefore, if the "macro" contains a virus, the virus is automatically loaded when editing the file.

Macro virus behavior and characteristics Macro virus is a new form of computer virus, but also a cross-platform computer virus. Virus behavior can be performed on Windows, Windows 95/98 / NT, OS / 2, Macintosh System7 and other operating systems.
The main characteristics of macro viruses are as follows:
1) Macro viruses can infect .DOC documents and .DOT template files.
2) Macro virus infection is usually when Word activates a macro virus when opening a document or template with a macro virus.
Macro virus behavior and characteristics (continued)
3) Most macro viruses include auto macros such as AutoOpen, AutoClose, AutoNew, and AutoExit. Through these auto macro viruses, documents (templates) can be obtained to operate.
4) Macro viruses always contain macro commands for reading and writing documents.
5) Macro viruses are stored in .DOC files and .DOT templates in BFF (Binary File Format) format. This is an encrypted compression format, and the format of each Word version may not be compatible.
6) Macro viruses are compatible

Symptoms of macro viruses
1) When opening a file with Word or Excel, "document not opened", "insufficient memory", "WordBasic Err = 514", etc. appear;
2) When saving the file, force the file to be stored as ".dot" type, or force it to be stored in the specified directory.
3) Macro virus version compatibility issues

Macro virus classification
1. Public (common) macro viruses such as macro viruses are effective for all Word documents. The trigger condition is to automatically trigger execution when the Word document is started or called. It has two notable features:
1) It can only be named by "Autoxxxx", that is, the macro name starts with "Auto", and xxx represents a specific macro file name. Such as AutoOpen, AutoClose, AutoCopy, etc.
2) They must be attached to the Word common template to have a "common" effect. Usually when the user does not specify and prepare other common templates, they should be attached to the Normal.dot template, or they must first be able to write themselves into such a template.

Macro virus classification (2)
2. The main difference between a private macro virus and a public macro virus is that the former is generally placed in a user-defined Word template and is only related to the Word document using this template, that is, only the document using this specific template. Macro viruses are effective, and private macro viruses generally do not work on documents using other templates.

Several macro viruses
AAAZAO Macro: Concept virus, the first macro virus;
Taiwan NO.1: The first Chinese word virus;
Rainbow Macro: can change the desktop color;
FormatC: Format C drive, the first Trojan-type macro virus;
Hot Macro: The first macro virus to call Windows API;
Nuclear Macr's first macro virus to interfere with printers and hard drives.

Macro virus hazards
1. Spread extremely quickly: because of the frequent exchange of documents;
2. Easy to make and change: Word Basic programming is easy
3. The possibility of destruction is extremely high: Word Basic can call Windows API, DLL, DDE

In addition to antivirus software, you can also try the following methods to prevent macro viruses:
1) Press and hold Press the key again to start Word, prohibit the macro from running automatically;
2) Tools  Macros, check and delete all macros that may carry viruses;
3) Use Disable AutoMacros macro
4) Set the properties of the template file such as normal.dot to read-only

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