Malware is “malicious software” that penetrates your device without your permission. It’s a method of infecting computers and networks in order to steal sensitive information.
Virus
A computer virus is a malicious software designed to compromise a system and change or delete information. The information on your computer could become unusable if it is infected with a virus. Human beings are responsible for carrying it out.
Your computer could become infected with a virus if you open an attachment that contains pictures, a message, or audio or video files, Exe, Zip, and software download links from unauthorized sources. Downloading unauthorized software from the internet is another way that viruses can spread. They might be concealed in a free or trial version of the software that you download, or in some other file.
Designed to compromise a system and change or delete information
” executable code ( .exe ) attached to another executable file ( .exe )”
ILOVEYOU, MyDoom
Boot Sector Virus: Disrupting the boot process by damaging the hard drive’s boot sector.
Macro Virus : MS Office – Excel and Word,
Program Virus: A programme virus is activated when the infected software is used.
Hijacker Virus (Web Scripting Virus): Specifically targets and alters browser settings. It’s called a “browser redirect virus” because it sends users’ browsers to dangerous websites.
Direct Action Virus : Once direct virus infected from exe. the infection can propagate to other files, leaving them unusable immediately .
Resident Virus: Hides in computer memory
Cavity Virus: As it doesn’t change the file size, and to steal important information same time virus infects files by filling in empty spaces
Polymorphic Virus : Self-Encryption-based virus that can hide from anti-virus detection. Changing its virus name frequently makes it tough to discover
Worms
Worms duplicate themselves on the local disc, network shares, any connected devices, etc. Worms replicate without human action. It doesn’t damage computer files. Worms spread by taking advantage of flaws in operating systems.
Replicates itself and then spreads over a network.
” Worms are similar to a virus but it does not alter or modify the program but worms hunt and kill system resources “
Famous Example : Stuxnet
