Properly set anti-virus software to capture email viruses

E-mails have become the main communication mode for daily office work of many enterprises. Today, virus is everywhere, and e-mails have become a way of spreading viruses. Many enterprises are vulnerable to the virus. As an enterprise user's network management system, how can we comprehensively prevent email virus erosion and create a secure application environment for daily office work?
Mail virus definition and features

"Mail virus" is actually the same as common computer viruses, but it is called "mail virus" because they are mainly transmitted through email ". Email virus is mainly used to infect users' computers with viruses or become a zombie in hackers' hands. "Mail virus" has the following features in addition to common viruses that can be transmitted, executable, destructive, and trigger:

1. High infection speed: in a single computer environment, viruses can only be transmitted from one computer to another through a USB flash disk or a CD, in the network, network communication mechanisms such as email can spread rapidly. According to tests, for a typical PC Network in normal use, as long as one workstation has a virus, it can infect hundreds of computers on the Internet within dozens of minutes.

2. Wide spread: enterprise mail not only spreads emails within a single enterprise, but this directly causes the spread of "mail virus" to be fast and extensive, it can not only quickly infect all computers in the LAN, but also spread the virus thousands of miles away.

3. Difficult to clear viruses: computer viruses on a single machine can sometimes be completely cleared by deleting files with viruses, formatting hard disks, and other measures. Once a computer in an enterprise is infected with a virus, it becomes very difficult to clear the virus. The computer that has just completed the cleanup may be infected by another virus-infected workstation on the network, it makes the mail virus very difficult.

4. High destructiveness: computers on the network will directly affect the work of the Network after being infected with the mail virus. In light of this, the speed will be reduced, the work efficiency will be affected, and the network and computer will crash, lost Data.

5. Concealment: email viruses are more concealed than other viruses. In general, mail viruses are usually hidden in the attachments of the mail, or in the email letterhead, which will accelerate the spread of viruses to a certain extent and increase the difficulty of virus detection and removal.

To prevent email viruses, you must be able to accurately identify email viruses, especially the enterprise's network administrators. You must be able to recognize the virus in a pair of eyes ". After understanding the characteristics of mail virus, it helps network administrators identify mail viruses. Next, I will introduce some tips for recognizing "email virus.

1. Check the attachment size: the attachment size of an email is usually the best carrier of "email virus". By checking the attachment size, you can identify whether the email carries viruses. Generally, the size of an attachment in a Word document is about several dozen kb, and the size of an image is about 50 KB (different definitions may cause a large gap in size ), if the attachment of an email is found to be several hundred kb, the email may carry a virus.

2. Email address: the email virus disseminators usually use unfamiliar email addresses. Be careful when receiving emails from unfamiliar addresses. If such emails have attachments, be cautious. Such emails may be infected with viruses. For emails from unfamiliar addresses, after reading the email address, you can read the email content again. If the content is irrelevant to your work, you can basically determine that the email is a virus carrier.

3. Identify the authenticity and rejection: when a user writes an email, if the recipient's email address is wrong, the email server will automatically return the email. Some "email virus" disseminators usually use disguised bounce messages to spread the virus, because there is usually an attachment in the bounce message, which is the body of the user's email. Once a user opens a fake email server system Bounce Message and looks at the attachment, "email virus" will infect the user's computer. To this end, enterprise users must identify the authenticity of the Bounce Message. The method to identify the authenticity and rejection is very simple. Just check the email address. For example, Netease's Bounce Message, Whose sender is displayed as a postmaster@126.com.

Prevent email virus intrusion

From the above description, it is not difficult to see that "mail virus" is also a type of virus, but it has some special characteristics. To this end, enterprise network administrators should make full use of the anti-virus function of the software to develop a thorough solution to Prevent email virus intrusion.

Set anti-virus software properly:

Most anti-virus software monitors files on disks in real time. Some anti-virus software does not support real-time monitoring of emails. Therefore, enterprise network administrators must install an anti-virus software with strong real-time email monitoring capabilities on their computers. In the aspect of real-time email scanning, Rising antivirus software is still very good. After the anti-virus software's email scanning function is enabled, you can check the email content and attachments during the sending and receiving processes, which can effectively prevent "email virus" intrusion.

Anti-Virus is a constant battle, and virus variants are also very fast. to completely prevent "email virus" intrusion, users must regularly update the virus database of anti-virus software. If the user does not upgrade the antivirus software virus library, the antivirus software will be ineffective once a new "email virus" appears.