A computer virus is a small program that gains access via online data traffic or a data carrier (USB stick, CD-ROM, DVD). It often tries to spread further afterward on the computer. There are many types of viruses that cause damage or decrease the performance of the computer in different ways.
A computer virus is a program or piece of code that is installed on your computer uninvited. Once present, it can perform a specific task. Unfortunately, this task can go unnoticed by the computer’s owner or, in the worst cases, take down the entire operating system.
The easiest way to find out that you have a virus on the PC is to install a virus scanner on the computer such as Malwarebytes. Those who have not done so will have to pick up subtle signals. For example, a computer that suddenly slows down or starts up is always a bad sign. Websites that look different are a signal as unwanted programs pop up in the start menu or somewhere else on the hard disk.
There is a distinction between regular viruses and worms. A virus is a small piece of code and needs an executable or document to be activated. The three main types are:
Executable virus: A type that is actually past its prime. After it is installed on the computer, it spreads until it is ready to accomplish its real purpose.
Boot sector virus: A nasty and persistent kind of virus that settles into your computer’s BIOS, giving it control over the boot procedure.
Macro virus: A macro virus targets Microsoft Office because it spreads quickly with documents. The Outlook Express mail program is also susceptible to this type of virus.
Worms can function independently and spread themselves over the Internet, preferably by copying themselves. These include:
Trojan horses: A virus embedded in an innocent program. Search bars are a favorite carrier.
Browser redirect: An irritating but usually less harmful infection. The worm causes your homepage or default search engine to be changed.
Malware: A category that has grown tremendously in recent years. It is a multifaceted collection of malicious software that tries to abuse a computer or user in many ways, for example, by collecting private data.
A computer virus can be prevented simply by installing a good virus scanner. After this, one should do a thorough scan of the system. In addition, it is essential to have the virus scanner updated automatically so that new threats can be combated. Never open email attachments from senders you do not know personally, and also watch out for emails from well-known companies. These company e-mails are often imitated. Downloading free software from unknown websites is very dangerous because it can contain malware.
Read more, what is malware.
