How to Prevent Trojan and virus attacks

How to Prevent Trojan and virus attacks
I. What are the symptoms of computer poisoning?

People who are ill may have various symptoms. Similarly, computer viruses may have some toxic reactions. If your computer has the following symptoms, Use anti-virus software to check for viruses.

1. Frequent crashes;

2. Files cannot be opened;

3. frequent reports of insufficient memory;

4. The system prompts that the remaining space on the hard disk is insufficient;

5. There are a large number of files with unknown origins;

6. Data loss without reason;

7. The system runs slowly;

8. The operating system automatically performs the operation.

Ii. Trojan

Everyone must have heard of the Trojan, but what is the trojan?

(1) Trojan

A Trojan virus is used to control another computer through a specific program (Trojan program. A Trojan usually has two executable programs: one is the control side and the other is the control side. The Trojan name is derived from the ancient Greek legend (the Trojan horse story in the Epic of HOMA. the Trojan horse in the word Trojan was originally intended to be a "Trojan Horse", that is, the Trojan horse on behalf of the Trojan horse, that is, the Trojan horse story ). A Trojan is a popular Virus File. Unlike a common virus, it does not multiply itself or infect other files, it attracts users to download and execute their own disguise, and provides the caster with a portal to open the host, so that the caster can destroy and steal the files of the victim, even Remote Control of hosts. The emergence of Trojan viruses seriously harms the safe operation of modern networks.

(2) Types of Trojan viruses

A Trojan is not a horse, but it also has different varieties. Let's take a note to introduce the common Trojan variants.

1. Online Game Trojans

Network Game Trojans generally use methods such as recording users' keyboard input, Hook game processes, and API functions to obtain users' passwords and accounts. The stolen information is generally sent to the trojan author by sending an email or submitting it to a remote script program.

The types and quantity of online game Trojans are second to none in Chinese Trojans. All popular online games are not threatened by online game Trojans. After a new game is officially released, a Trojan program is often created within one or two weeks. The public sales of a large number of Trojan generators and hacker websites are also one of the reasons for the flood of online game Trojans.

2. Online Banking Trojan

The online banking Trojan is a trojan virus designed for online transaction systems. It aims to steal users' card numbers, passwords, and even security certificates. Although the number of such Trojans is not comparable to that of online game Trojans, the harm is more direct and the loss of victim users is more serious.

The online banking Trojan is usually highly targeted. The trojan author may first carefully analyze the Online Transaction System of a bank, and then write a virus program for the security weaknesses. On September 16, 2013, the computer manager of the security software intercepted the latest variation of the online banking Trojan, "Ma Wen". The Ma Wen virus was able to modify the payment interface without any trace, so that users could not notice it at all. Fake QVOD is widely spread through poor websites. When users download the trojan Player file and install it, it will be a Trojan horse. After the virus runs, it will start to monitor users' network transactions, block balance Payment and quick payment, force users to use online banking, and tamper with orders by taking the opportunity to steal property.

With the popularity of online transactions in China, the number of users threatened by external online banking trojans is also increasing.

3. FTP Trojan

FTP Trojan opens port 21 of the controlled computer (default port used by FTP ), this allows everyone to directly connect to the controlled computer through an FTP client program without a password, and upload and download with the highest permissions to steal confidential files of victims. The new FTP Trojan is added with the password function, so that only the attacker knows the correct password and enters the computer of the other party.

(3) Hazards of Trojan viruses

The Greek used a Trojan horse to break the gate of Trojan, and hackers used the trojan program to break your computer full of vulnerabilities, causing various dangers.

1. Stealing our online game accounts threatens the security of our virtual assets

Trojan viruses will steal our online game accounts, steal accounts, and immediately transfer game equipment in the accounts, and then the trojan virus users sell these stolen game equipment and coins to make profits.

2. Stealing our online banking information threatens the security of our real assets.

Trojans steal our online banking accounts and passwords and send them to hackers by means of keyboard records, which directly leads to economic losses.

3. Using Instant Messaging Software to steal our identities and spread Trojans and other bad information

A computer with a Trojan virus will download the program specified by the virus author, which is harmful to uncertainty, such as paralyzing a computer.

3. How to Prevent Trojan and other virus attacks?

We need to do this in order not to be defeated by a Greek Trojan like a Trojan:

1. install anti-virus software on your computer, regularly scan the system, scan for viruses, and update the virus database and system patches in a timely manner;

TIP: programming is not perfect, so there will inevitably be bugs in the software, and patches are specifically used to fix these bugs. Because the released software has defects, it was found that another small program was compiled to improve it. This small program is commonly known as a patch. Regular patch upgrades to the latest security patches can effectively prevent illegal intrusion.

2. When downloading software, go to the official website or a large software download website as much as possible, and take anti-virus measures before installing or opening software or files of unknown origins;

3. Do not open links to unknown websites, especially links to poor websites. Do not open links to strangers via QQ;

4. when using network communication tools, you do not receive files from strangers. If you receive files, you can cancel the "Hide known file type extensions" function in "Folder Options" in the tool menu bar to view the file type;

5. Enhance permission management for public disk space and regularly detect and kill viruses;

6. Check the mobile memory with anti-virus software before enabling it. You can create a folder named "autorun. inf" in the mobile memory (which can be started against the USB flash drive virus );

7. When you need to download data from public networks such as the Internet and transfer it to an intranet computer, you can use a CD-ROM to transfer the data;

8. Set a password for each account in the computer system to promptly delete or disable expired accounts;

9. Regularly back up the data so that the data can be quickly repaired after the virus is seriously damaged.