Graynet-Security





What is "Computer Virus"?

It's "programs designed to intentionally cause damage to third party programs"!

What is there?

The main (famous) viruses are shown in the table again. Please take a look.

NameWhat is it?
Worm A terrifying virus that spreads through a network in an instant.
It is called "Worm" because it can exist alone.
And not only from the network, but also from external media such as USB memory!
Trojan horse It's also a scary virus that seems innocuous and has been destroyed or leaked behind the scenes, based on the tactics used in Greek mythology.
File-infection virus A virus that parasitizes and multiplies program executables (For example, "Extension" is exe.). There are 2 types, "Overtype" and "Write-once type".
Macro virus A virus that exploits a function called "Macro" in Microsoft's "Word" and "Excel" business software.
Spyware A program that sends various pieces of information out of the computer on which it is installed.
It's called "Malware" = "Spyware" like "spy" because it works without your knowledge.
It does not increase because the purpose is to collect information.

～Presence of malware～

I started with "What is a virus?" and briefly described the main types of viruses, but they were actually contained within the "Malware".

So what is the "Malware"?
The answer is simple.







"Any malicious program."The end.
Malicious+Software=Malware
That's where it comes from.
Right? Isn't it easy?

※This is how it is illustrated.
(Made by "Team Graynet")

Learn about the entry pathway

Here's how to avoid viruses! I'd like to, but first of all, let's know how viruses come in.

Cause

Detail

Images (Made by "Team Graynet")

Mails

When you open a mail attachment,
tragedy begins.
Access to unauthorized sites

When you visit a malicious site,
malware is automatically downloaded.
Over the network

Unprotected or otherwise vulnerable computers can become infected with malware through "only" that connect to the network.
External Media

There is malware in CD-ROM, DVD and USB memory, and when you load it, a tragedy begins...!
Install without your knowledge

There is a huge amount of malware in the smartphone app store (Especially for Android).
But they disguise their appearance (icons, etc.), so users install dangerous apps themselves.
And there have also been a number of such cases.

Of course, there are other causes, but this is the most common one.

What should we do?

What can we do about these horrible viruses?


※The update will give you more peace of mind!
(Made by "Team Graynet")

Check the URL!

The URL is 1 per 1 site, so the URL of the fake site is "quite different" or "slightly different" with the URL of the real site!
Examples: "helloworld.com" for real URLs, "hel1oworld.com" for fake URL.
There are other ways to distinguish them, but I will introduce them later.

Keep your Internet browser up to date!
Not only browser, but also OS, apps and software!


As of October 25, 2019, Windows 10
is at version 1903, Macos
is at Catalina, iOS is at iOS 13.1.3

Install anti-virus software!

（Trend Micro Internet Security, Norton and Kaspersky, etc.）

When downloading files from outside, make sure the source is trustworthy, and be careful!


However, even if you take sufficient measures, the possibility of virus infection will not be zero.
So, I will tell you what to do if you are infected.


  • (What to do immediately after infection!)
    Disconnect the computer from the Internet and prevent it from infecting other computers connected to the same location!
  • Report the damage to IPA (Information Processing Promotion Organization)!
    (It is used to expand damage and prevent recurrence.)
  • ※Last resort※PC initialization.

    		•

    Summary

    • 「Computer Virus」...Programs designed to intentionally cause damage to third party programs!
    • 「Malware」...A generic term for malicious programs! Computer viruses are included in malware!
    • There are a lot of things we can do about viruses that are just scary, but it doesn't mean that we can't get them because we've taken measures!
    • 「Worm」...A virus that spreads rapidly over a network.
    • 「Trojan horse」...They are destroying data or leaking information behind the scenes.
      The name is derived from the tactics used in Greek mythology.
    • 「File-infection virus」...A virus that parasitizes and multiplies program executables.
    • 「Macro virus」...A virus that exploits a function called "Macro" in "Word" and "Excel".
    • 「Spyware」...It sends various information inside the computer to the outside.

    About "why?"