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    Some of the malwares are as follows:
                        Virus: A computer virus is a program that is able to copy itself when it is run. It gets activated
                       each time the program or file to which it is attached is opened or executed. It is the most
                       common  type  of  malware.  It  can  spread  itself  by  infecting  other  programs  or  files.  This
                       affects the original program, causing it to no longer work properly.

                        Worm: A worm is similar to virus but it can copy itself and spread rapidly to any device
                       attached. A worm does not need any program to activate it.
                        Trojan Horse: A trojan horse is a dangerous virus. It represents itself as helpful software
                       program. Once the user clicks on it to agree to run it, it gains access to sensitive data and then
                       modifies, blocks, or deletes the data. It cannot copy itself from one computer to another.
                        Spyware: A spyware steals important information and data on the device, such as account
                       passwords or bank details. It observes the user's activity without their knowledge.

                        Adware:  An  adware  tracks  user's  browser  and  download  history  and  keeps  popping
                       advertisements on the screen.

                              Factbot

                       In 1986, the first virus was written for Windows based PCs by two brothers, Basit and Amjad
                       Farooq Alvi, from Pakistan, who were only 17 and 24 years old at the time. They named it “Brain”.

                     THE MOST DANGEROUS MALWARES KNOWN

                       Wabbit Virus (1974) makes multiple copies of itself until the system slows down and crashes.
                       ILOVEYOU Virus (2000) worked by sending a fake “love letter” that looked like a harmless
                       text file.
                       Code Red Worm (2001) would spread itself with the message: “Hacked By Chinese!”

                       Mydoom Worm (2004) scraped addresses from infected machines, then sent copies of itself
                       to those addresses.
                       Storm Worm (2007) attacked millions of computers with an email about approaching bad
                       weather.

                       Zeus, also known as Zbot Trojan horse (2007) was made with an intention to steal banking
                       information of United States Department of Transportation.
                       Emotet (2014) is considered one of the most destructive and dangerous Trojans. It spreads
                       through spam emails to steal banking information.
                       Pegasus (2016) is commercial spyware. It secretly infects a smartphone (Android or iOS)
                       and tracks the device completely for every action.

                                        What if you could design an impenetrable cyber fortress to protect your computer
                                        from  hackers?  What  features  would  it  have,  and  how  would  you  use  technology
                                        to build it?

                                                                                         Safeguarding Your Computer    95

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