Types of worms viruses

The rules for classifying detected objects with multiple functions should be used to classify these types of worms. Solutions for:. Unlike the in-depth articles in the Knowledge Base, every definition in the Glossary is succinct, while remaining highly informative.

This section is currently under construction. Viruses spread when the software or document they are attached to is transferred from one computer to another using the network, a disk, file sharing, or infected email attachments. Computer worms are similar to viruses in that they replicate functional copies of themselves and can cause the same type of damage. In contrast to viruses, which require the spreading of an infected host file, worms are standalone software and do not require a host program or human help to propagate.

To spread, worms either exploit a vulnerability on the target system or use some kind of social engineering to trick users into executing them. A worm enters a computer through a vulnerability in the system and takes advantage of file-transport or information-transport features on the system, allowing it to travel unaided. More advanced worms leverage encryption, wipers, and ransomware technologies to harm their targets.

A Trojan is another type of malware named after the wooden horse that the Greeks used to infiltrate Troy. It is a harmful piece of software that looks legitimate. Users are typically tricked into loading and executing it on their systems. After it is activated, it can achieve any number of attacks on the host, from irritating the user popping up windows or changing desktops to damaging the host deleting files, stealing data, or activating and spreading other malware, such as viruses.

Trojans are also known to create backdoors to give malicious users access to the system. Unlike viruses and worms, Trojans do not reproduce by infecting other files nor do they self-replicate.

Trojans must spread through user interaction such as opening an email attachment or downloading and running a file from the Internet. Bots often automate tasks and provide information or services that would otherwise be conducted by a human being. They may also be used to interact dynamically with websites.

Bots can be used for either good or malicious intent. In addition to the worm-like ability to self-propagate, bots can include the ability to log keystrokes, gather passwords, capture and analyze packets, gather financial information, launch Denial of Service DOS Attacks , relay spam, and open backdoors on the infected host. Bots have all the advantages of worms, but are generally much more versatile in their infection vector and are often modified within hours of publication of a new exploit.

They have been known to exploit backdoors opened by worms and viruses, which allows them to access networks that have good perimeter control. Bots rarely announce their presence with high scan rates that damage network infrastructure; instead, they infect networks in a way that escapes immediate notice. Advanced botnets may take advantage of common internet of things IOT devices such as home electronics or appliances to increase automated attacks.

Crypto mining is a common use of these bots for nefarious purposes. Advanced malware typically comes via the following distribution channels to a computer or network:. A set of stealthy and continuous computer hacking processes, often orchestrated by a person or persons targeting a specific entity. An APT usually targets either private organizations, states, or both for business or political motives. APT processes require a high degree of covertness over a long period of time.

The "advanced" process signifies sophisticated techniques using malware to exploit vulnerabilities in systems. The "persistent" process suggests that an external command and control system is continuously monitoring and extracting data from a specific target. The "threat" process indicates human involvement in orchestrating the attack. Software that generates revenue for its developer by automatically generating online advertisements in the user interface of the software or on a screen presented to the user during the installation process.

The software may generate two types of revenue: one is for the display of the advertisement and another on a "pay-per-click" basis if the user clicks on the advertisement. Worth noting is ransomware is increasingly being paid in cryptocurrency and this is sometimes referred to as crypto-malware. WannaCry, : This ransomware attack targeted thousands of computer systems around the world that were running Windows OS and spread itself within corporate networks globally.

Victims were asked to pay ransom in Bitcoin to retrieve their data. Botnets are a type of malware that gain access to devices through a piece of malicious coding. In some cases, botnets directly hack devices, with cybercriminals even taking remote control of devices. Adware, as the name indicates, is malware that involves advertising. Mobile adware, meaning adware on mobile devices, has become increasingly common and can be contracted through third-party app downloads.

Ultimately, adware can:. This is often for the purpose of spying on internet activity, tracking log in and password information, or collecting sensitive information that can be used for fraudulent purposes. Keyloggers , as well, are a popular form of spyware that can be used to track and log the keys you strike on your keyboard, capturing any information typed. DarkHotel, : This keylogger spyware targeted government and business leaders using hotel Wi-Fi.

Since rootkits are designed to remain hidden, they can hijack or subvert security software, making it likely that this type of malware could live on your computer for a long time causing significant damage. Zacinlo, : This rootkit stayed stealthy until about when it was first detected, delivering adware and disabling antivirus software on primarily Windows devices. Fileless malware is a type of malware that uses software, applications, and protocols already built-in or native to device operating systems to install and execute malicious activities.

In other words, no files are needed to download this type of malware, hence the name fileless malware. Fileless malware is memory-based, not file-based. Once installed, fileless malware piggybacks on legitimate scripts by executing malicious activity while the legitimate programs continue to run.

Thanks to this stealthy nature, fileless malware is tough to spot. Astaroth, : This fileless malware was a true info-stealer and primarily targetted Windows devices and in specific countries, including Brazil. Not to be confused with adware, malvertising is a type of malware that comes from ads on legitimate websites.

Adware, however, is a type of malware that is already on a device. Both attacks rely on online advertising to do their damage. You can fall victim to malvertising by clicking on an infected ad — cybercriminals may even pay to place these on websites — or by visiting a website that is home to a corrupted ad and becoming victim to a drive-by download. Malware is overwhelmingly spread via email. By some counts, 94 percent of it is delivered by email. Still, cybercriminals harness many methods to pull off a malware attack.

D ,trile. C Trojan Horses: Allow the hackers to gain remote access of a target system. Once a Trojan horse has been installed on a target computer system, the hacker can access it remotely and perform various operations. Software that can be used to compromise computer functions, steal data, bypass access controls, or otherwise cause harm to the host computer.

Adware: Advertisement-supported software They are generally spread through download of a software from an untrusted source from Internet It is any software package that automatically delivers advertisements Common examples of adware include pop-up ads on websites and advertisements that are displayed by software.

Spyware: The spy inside your PC. Ransomware holds a computer system, or the data it contains, hostage against its user by demanding a ransom for its restoration. Ransomware can be downloaded by the unwitty users through some websites. They may also arrive as a payload, either dropped or downloaded by other malware.

Some ransomware are delivered as attachments to spammed email. Shortcut virus: creates shortcut files everywhere in the pc, results in disk space consumption. RootKit :Activated each time your system boots up. Email Virus: V irus spread via an email.