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After the file becomes resident in the system memory below the 640K DOS boundary, system slow-down occurs as a result of the virus' polymorphic code. [citation needed] Symptoms include video flicker and output to screen appearing very slowly. Files may seem to "hang" even though they will eventually execute correctly.
ABC, discovered in October 1992, is a memory-resident, file-infecting computer virus which infects EXE files and may alter both COM and EXE files. ABC activates on the 13th day of every month. Upon infection, ABC becomes memory-resident at the top of system memory but below the 640 K DOS boundary and hooks interrupts 16 and 1C.
The virus will "safely" overwrite the boot sector if the root directory has no more than 96 files. The PC was typically infected by booting from an infected diskette. Computers, at the time, would default to booting from the A: diskette drive if it had a diskette. The virus was spread when a floppy diskette was accessed with an infected computer.
File size is a measure of how much data a computer file contains or how much storage space it is allocated. Typically, file size is expressed in units based on byte . A large value is often expressed with a metric prefix (as in megabyte and gigabyte ) or a binary prefix (as in mebibyte and gibibyte ).
In their announcement report, Kaspersky Lab concluded: "The Titanium APT has a very complicated infiltration scheme. It involves numerous steps and requires good coordination between all of them. In addition, none of the files in the file system can be detected as malicious due to the use of encryption and fileless technologies. One other ...
Appearance of Lehigh virus (discovered at its namesake university), [20] boot sector viruses such as Yale from the US, Stoned from New Zealand, Ping Pong from Italy, and appearance of the first self-encrypting file virus, Cascade. Lehigh was stopped on campus before it spread to the "wild" (to computers beyond the university), and as a result ...
An example of this is a portable execution infection, a technique, usually used to spread malware, that inserts extra data or executable code into PE files. [34] A computer virus is software that embeds itself in some other executable software (including the operating system itself) on the target system without the user's knowledge and consent ...
Mocmex collects passwords for online games. The virus is able to recognize and block antivirus protection from more than a hundred security companies and the Windows built-in firewall. Mocmex downloads files from remote locations and hides randomly named files on infected computers. Therefore, the virus is difficult to remove.
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