23-12-2017, 04:31 PM
Symptoms of a computer virus
1.Computer runs-slower than usual.
2.Computer stops responding.
3.Applications do not work properly.
4. Disks or disk drives may be inaccessible.
5.It shows universal error message.
*Examples for computer viruses - TEXAS Virus, Blaster, Nimda, I Love You, Guppy, 1 Melissa, Slammer
Antivirus
*Antivirus is a computer software which is used to prevent, delete and detect the presence of VIRUS in Computer.
*Examples of antivirus program - Avast, Avira, AV G antivirus, Kaspersky, Norton, McAfee
Worm
*Worm is a subclass of computer virus
*Worms can replicate itself to the hundreds and thousands of its copy through network connections to any machine without any human intervention
Trojan Horses
*Trojan horses ire hot viruses
*Trojan horse is a malware which appears to be useful applications like screen savers
*But it allows hacker to take control of the system by remote login.
*It does not replicate itself instead it makes the user to trust and receive the infected files.
Logic bomb
* Logic bomb is a piece of code (program) inserted into a software
* system that will execute its malicious function when the specified conditions are met.
*Trojans that activate on certain dates (as set by its designer) are often called as time bombs
Ransomware
* It is a very popular way internet criminals to make money
* Ransomware make the user unable to access the system displaying some kind of screen demanding some form of payment to have the computer unlocked.
Adware
* Adware is not truly a malware. It is asoftware package that automatically renders advertisements in order to generate revenue for its author.
* Adware tracks our internet browsing habits and sends popup advertisements related to the sites and topics of our interes
Keyloggers
*Keylogger is a software that can record every keystroke we make to login a file
* A key logger can record instant messages, email and any information we type at anytime using our keyboard.
