Understand the secrets of the virus and build a safety armor for win7

Computer network security is becoming more and more important. Windows 7 as Microsoft's next-generation operating system, a new interface, more user-friendly features make operation easier, especially in terms of security than the previous system is more stable and reliable. But is win7 really safe? The answer is of course no, then how to defend against the virus on the win7 system.

I often hear some "more professional” IT staff said, & rdquo; users installed anti-virus The software is no problem, but there is no concept of anti-virus, I thought it would not be poisoned?"

To be harmless, more importantly, to understand the operation of the virus and anti-virus The way to preserve software. Here, I hope that for the computer users of general enterprises, it can provide some "anti-virus concepts". Maybe it can't be "guaranteed", but at least you can have a general understanding of what's happening on your computer!

Compact and fragile boot program

From the time the power is turned on until the operating system is loaded, this is commonly known as the "starting program". Since most viruses will try to make themselves part of the "starting program" (for parasitism and infection), you must first know what steps the whole program has:

1. Power on, if the hardware is all right Then proceed to the next step

2. The BIOS (Basic Input/Output System) performs a routine boot check and then takes over the boot process with the default storage device

3.According to industry-recognized specifications The default boot device (usually a hard disk drive) starts the software boot process, and sequentially loads the core of the operating system, the driver … …

4. After the kernel of the operating system is loaded, it can also be set according to Set, load the user-specified resident programs (antivirus software, IM software … …)

In each of the above boot procedures, from this step to the next step, will leave One & rdquo; hook point & rdquo;. For example, the BIOS system on the motherboard should execute the boot process of the storage medium. It will execute the boot command from a fixed location. Where is this fixed location? We don't need to know it, but this location is definitely a public specification.

So, the person who writes the operating system knows where the storage media is powered on. The person who writes the disk maintenance program also knows that the person who writes the tool program knows, and the person who writes the virus …… of course knows, so There is a so-called "start-up virus".

However, this kind of modern "start-up virus" is very rare, mainly because the operating system loaded after booting is quite large and complicated, such viruses are difficult to be in such a complicated boot situation. It can still work normally. Most of the current viruses are mostly destroyed in the operating system.

The possibility of not booting is ……

Whether it's Windows, MacOS, Linux or BSD, the initial loading of the operating system is made up of delicate sequential steps. Then a ring. The operating system usually has to set the operating mode of the processor, load the system core, driver and drawing interface, then load the resident program, and finally hand over the usage rights to the user. If this series of "defective" is also "fragile", the process is a little mistake, the system can not load, the user will say "ah, this computer is hung up /crashed /can not open /Dead …… all sorts of sayings:

Driver has a problem

Core program has a problem

Save the OS core program disk out The problem

The user's resident program has a problem

As long as there is a small link error, the operating system may not load properly - fortunately this situation does not happen often.

So far, the above concepts sound very simple? Previous123Next page Total 3 pages