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A terminate-and-stay-resident program (commonly TSR) is a computer program running under DOS that uses a system call to return control to DOS as though it has finished, but remains in computer memory so it can be reactivated later. [1] This technique partially overcame DOS's limitation of executing only one program, or task, at a time.
Others include randomly moving the cursor slightly; opening up satirical Google searches under Google.co.ck, such as "how to remove a virus" and "how to get money" on the user's web browser; reversing text; and opening various random Microsoft Windows programs, such as the calculator or command prompt
The first line is a reference to the method used to find COMMAND.COM to infect, as well as file types that the virus infects. The second line refers to the version of MS-DOS that Ontario.2048 was written on. The third is a reference to the Youngsters Against McAfee virus group, which the author had joined by this point.
Like biological viruses, computer viruses also have a knack for spreading like wildfire. However, their modus operandi is to copy their codes copiously into other programs with one malicious goal ...
AUTOEXEC.BAT is a system file that was originally on DOS-type operating systems.It is a plain-text batch file in the root directory of the boot device.The name of the file is an abbreviation of "automatic execution", which describes its function in automatically executing commands on system startup; the filename was coined in response to the 8.3 filename limitations of the FAT file system family.
Zeus is very difficult to detect even with up-to-date antivirus and other security software as it hides itself using stealth techniques. [5] It is considered that this is the primary reason why the Zeus malware then had become the largest botnet on the Internet: Damballa estimated that the malware infected 3.6 million PCs in the U.S. in 2009. [6]