Nonresident viruses replicate through modules. When the module is executed, it will select one or more files to infect. Stealth viruses trick antivirus software by appearing like they are real files or programs and by intercepting its requests to the OS. Some antivirus software cannot detect them.
Sometimes, it temporarily removes itself from the system without deletion. Sparse infectors use different techniques to minimize its detection. For example, they may only want to infect a program every tenth execution.
Because they are occasional infectors, antivirus software has a hard time detecting them. They also implement stealth techniques so that users cannot determine the increase the file code. The most popular Spacefiller is the Lehigh virus. Basically, this type of virus ruins file allocation system where the information about files, including the location, exist. This includes worms, adware, malware, Trojan, and ransomware. To prevent these viruses from affecting your computer, it is important that you install the best and the most competitive antivirus software that can detect, block, and eliminate all types of computer viruses.
Skip to content. Computer Internet Security. Multipartite Virus This type of virus can easily spread in your computer system. Direct Action Virus Direct action viruses attack certain types of files, typically. Browser Hijacker This type of virus infects your web browser in which it will bring you to different websites. Overwrite Virus From the name itself, this virus overwrites the content of a file, losing the original content.
Web Scripting Virus This virus lives in certain links, ads, image placement, videos, and layout of a website. Boot Sector Virus Boot sector viruses affect floppy disks. Macro Virus Macro viruses target applications and software that contain macros. Directory Virus Directory viruses change file paths. Polymorphic Virus Polymorphic viruses use a special method of encoding or encryption every time they infect a system.
File Infector Virus This virus also infects executable files or programs. Encrypted Virus This type of virus uses encrypted malicious codes which make antivirus software hard to detect them. As the name implies, overwrite viruses overwrite file content to infect entire folders, files, and programs. This sneaky virus disguises itself in the coding of links, ads, images, videos, and site code. It can infect systems when users download malicious files or visit malicious websites.
By targeting executable files. Network viruses travel through network connections and replicate themselves through shared resources. One of the easier viruses to avoid, this virus hides out in a file on a USB drive or email attachment.
The key to protecting yourself from computer viruses is having multiple layers of cybersecurity defense. There are multiple layers to consider in a cybersecurity plan, like user education , endpoint detection and response EDR , DNS filtering , and more. Learn more about the 11 layers of cybersecurity.
Your individual solution will depend on factors like the size of your business, industry, organization type, and long-term business goals. The easiest way to illustrate multilayered computer virus protection, is by imagining each individual layer of cybersecurity as a slice of swiss cheese. Each slice has a few holes in it, and as you stack slices on top of one another, you cover up the holes. Download the Essential Business Guide to Cybersecurity.
Have you been noticing symptoms of a computer virus lately? Are you looking to reevaluate your current cybersecurity solution? We can help. Get in Touch. Search for: Search Button.
Published: June 27, Share This Blog. Ransomware has become hugely popular among hackers and cybercriminals for obvious reasons. CryptoLocker was one of the first examples. Released in September , CryptoLocker spread via email attachments and encrypted files on infected computers making them impossible to access. In order to restore access to their data, users had to pay a ransom, at which point the cybercriminals behind CryptoLocker would send a decryption key that could be used to unencrypt the files.
Some users reported that they were able to regain access by carrying out a System Restore or using data recovery software. Others said that when they had tried to recover files, they had lost them completely. Sasser and Netsky were two different viruses but are often grouped together because they are believed to have been created by the same person.
Sasser worked by scanning random IP addresses, connecting to the computers using them via a vulnerable port, and instructing them to download the virus using a buffer overflow in Windows and Windows XP. Netsky was spread by email and enticing recipients to open an attachment. In , a German student was arrested on suspicion of creating the viruses. Named after the Russian tennis player, the Anna Kournikova was more of a joke than anything more sinister and designed to exploit that fact that in the early-nineties, Anna Kournikova was one of the most searched for terms on the internet.
When users clicked the link, instead of reading a news story, they download a virus that then turned their computer into a bot that re-distributed the email. The boot sector was moved to another sector and marked as bad. Meanwhile text was written into the infected sectors which, remarkably, included the virus authors names and telephone numbers.
These are just ten of the thousands of well-known viruses that have attacked computers over the last several decades. There are several available for Mac and PC that will scan your computer for free.
If you have a Mac, you can also use the malware utility in CleanMyMac X to regularly scan your Mac and keep it safe from viruses. The best protection, however, is common sense. How To. Hit Return or Enter to search. What are the top 10 viruses of all times?
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