What Is Non Resident Virus?

What does the I Love You virus do?

The worm inflicts damage on the local machine, overwriting random types of files (including Office files, image files, and audio files; however after overwriting MP3 files the virus hides the file), and sends a copy of itself to all addresses in the Windows Address Book used by Microsoft Outlook..

Who created viruses?

Dmitri IvanovskyVirulent, from Latin virulentus (poisonous), dates to c. 1400. A meaning of “agent that causes infectious disease” is first recorded in 1728, long before the discovery of viruses by Dmitri Ivanovsky in 1892.

Is a virus a computer?

A computer virus, much like a flu virus, is designed to spread from host to host and has the ability to replicate itself. … In more technical terms, a computer virus is a type of malicious code or program written to alter the way a computer operates and is designed to spread from one computer to another.

Who invented resident virus?

The first widespread virus for an IBM PC operating system was called Brain. Like Elk Cloner, it was also a boot sector virus, although its creators had little in common with Skrenta. Pakistani brothers Basit and Amjad Farooq Alvi say they had’t heard of him or Elk Cloner when they wrote Brain in 1986.

How do resident and nonresident memory differ?

How is a memory-resident part of an operating system different from a nonresident part of an operating system? Memory resident means it remains in memory while the computer is running. Nonresident memory is the remaining instructions on a storage medium until they are needed.

What’s the worst computer virus?

Notable instancesConficker.Creeper virus – The first malware that ran on ARPANET.ILOVEYOU.Leap – Mac OS X Trojan horse.Shamoon a wiper virus with stolen digital certificates destroyed over 35,000 computers owned by Saudi Aramco.Storm Worm – A Windows trojan horse that forms the Storm botnet.More items…

Is iloveyou a virus or worm?

VBS/LoveLetter is a VBScript worm. It spreads through email as a chain letter, using the Outlook email application. ILOVEYOU is also an overwriting VBS virus, and it spreads itself using the mIRC (Internet Relay Chat) client as well.

What are the top 5 computer viruses?

The Top 10 Worst Computer Viruses in HistoryKlez – $19.8 billion. … ILOVEYOU – $15 billion. … WannaCry – $4 billion. … Zeus – $3 billion. … Code Red – $2.4 billion. … Slammer – $1.2 billion. … CryptoLocker – $665 million. … Sasser – $500 million. The Sasser worm was written by a 17-year-old German computer science student named Sven Jaschan.More items…•

How do you tell if your computer has a virus?

If you notice any of the following issues with your computer, it may be infected with a virus:Slow computer performance (taking a long time to start up or open programs)Problems shutting down or restarting.Missing files.Frequent system crashes and/or error messages.Unexpected pop-up windows.More items…•

What are the 3 types of viruses?

List the types of viruses In biology. Based on their host, viruses can be classified into three types, namely, animal viruses, plant viruses, and bacteriophages.

Which is the dangerous computer virus?

ILOVEYOU virusPerhaps the most virulent computer virus ever created, the ILOVEYOU virus managed to wreck PCs all across the world. Infecting almost 10% of the world’s PCs connected to the Internet, the virus caused a total damage of around $10 billion.

What is non resident in income tax?

An individual residing abroad is defined as a Non-Resident in a Financial Year under the Income Tax Act if his stay does not exceed 181 days. … The current tax law states that an Indian citizen who stays abroad for employment or is carrying on business for an uncertain duration is a non-resident.

What is the difference between virtual and resident memory?

resident memory typically refers to physical RAM installed in the machine. virtual memory is Hard Disk space reserved for the O/S to act as RAM. The O/S “swaps” data in and out of the virtual memory to place it in RAM, or to take it out of RAM. linux “swap” devices are exactly this.

What is a resident virus?

A type of malware that hides and stores itself within the computer’s memory. This type of virus even attach itself to anti-virus applications, thereby allowing it to infect any file scanned by the program. …

What is non resident memory?

Nonresident Memory Memory may be resident or nonresident. When nonresident memory is accessed, data is copied to that memory from a disk or other storage. It therefore requires complicated processing such as disk access by a device driver.