In last article, we learnt that what is Malware. There are different types of malware such as Virus, Trojan, Worms, Spyware etc. Here we will go little bit in detail and talk about types of malware.
Different types of malware:
A computer virus is a type of malware that propagates by inserting a copy of itself into and becomes part of another program. It spreads from one computer to another, leaving infections as it travels. Viruses can range in severity from causing mildly annoying effects to damaging data or software and causing denial-of-service (DoS) conditions. Almost all viruses are usually attached to an executable file. It means virus may exist on your computer system but will not be active or spread until a user runs or opens the malicious host file or program.
Adware is also known as advertising-supported software. It is software which renders advertisements for the purpose of generating revenue for its author. The advertisements are published on the screen presented to the user at the time of installation. Adware is programmed to examine which Internet sites, the user visits frequently and to present and feature related advertisements. Not all adware has malicious intent, but it becomes a problem anyway because it harms computer performance and can be annoying.
This type of malicious software, spies on you, tracks your internet activities. It helps the hacker in gathering information about the victim’s system, without the consent of the victim. This spyware’s presence is typically hidden from the host and it is very difficult to detect. Some spyware like keyloggers may be installed intentionally in a organization to monitor activities of employees.
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 Trojan is another type of malware named after the wooden horse the Greeks used to infiltrate Troy. It is a harmful piece of software that looks legitimate. Trojans are designed to make a user think they are a safe program and run them. It may be programmed to steal personal and financial information and later take over the resources of the host computer’s system files. In large systems it may attempt to make a host system or network resource unavailable to those attempting to reach it.
Ransomware is an advanced type of malware that restricts access to the computer system until the user pays a fee. Your screen might show a pop up warning that your have been locked out of your computer and that you can access only after paying the cyber criminal. The cyber criminal demands a ransom to be paid in order for the restriction to be removed. The infamous Cryptolocker is one type of ransomware.
Bots can be used for either good or malicious intent. A malicious bot is self-propagating malware designed to infect a host and connect back to a central server or servers that act as a command and control (C&C) center for an entire network of compromised devices, or “botnet.” With a botnet, attackers can launch broad-based, “remote-control,” flood-type attacks against their target(s).
Realising that your Computer or Laptop is infected with a malware is worrying but with careful and decisive action its not very difficult to remove it. We will discuss more about in our next article.
Hope you got a good idea about different types of malware. Please feel free to post your thoughts/comments/question using comment box.