Internet Safety: Viruses
File infector viruses: these infect program files, such as applications, games or utilities. They are often memory-resident, meaning that once they have been executed they remain active in the computer’s memory and can infect more programs. Examples include
Jerusalem and Cascade
.
Is file virus a virus?
File Virus
File viruses are commonly found in
executable files
such as .exe, . vbs or a .com files. If you run an executable file that is infected with a file virus, it can potentially enter your computer’s memory and subsequently run your computer.
Which virus is also known as the file virus?
A well-known boot sector virus is
the Michelangelo virus
. File infectors, as their name implies, “infect” files on a computer by attaching themselves to executable files. They do this by either appending their code to the file or overwriting portions of the file code.
What is file infectors virus?
A file infector virus is
a type of virus that typically attaches to executable code
, such as computer games and word processors. Once the virus has infected a file, it can spread to other programs, and even into other networks that utilize the infected files and programs.
What is the cavity virus?
Some viruses can infect files without increasing their sizes or damaging the files. They accomplish this by overwriting unused
areas of executable files
. These are called cavity viruses. For example, the CIH virus, or Chernobyl Virus, infects Portable Executable files.
What is the full form of virus?
The full meaning of the virus is
Vital Information Resources Under Siege
.
What is network virus?
The strictest definition of a “network virus” describes
a relatively new type of malware that spreads from computer to computer
without having to drop a file-based copy of itself in any of the affected computers. These viruses exist only as network packets, when they move from one computer to another, and in memory.
What are the 3 types of viruses?
- Macro viruses – These are the largest of the three virus types. …
- Boot record infectors – These viruses are known also as boot viruses or system viruses. …
- File infectors – These viruses target .
Is .exe files a virus?
This type of virus infects EXE files. An EXE file is
a binary executable file
. EXE files can be 16-bit and 32-bit. 16-bit executable files contain for 16-bit operating systems such as DOS and Windows 3.
Can virus be in PDF files?
PDFs can have viruses that come embedded with a code
that makes documents signable and (somewhat) editable. The mechanics are very similar to virus-infected Microsoft Word files. While their malware hides inside macros scripts, an infected PDF file will contain malicious JavaScript code.
Is Vienna a file infector virus?
Variant:Vienna.Reboot
Such trojanised files
do not contain any virus code
, but F-Secure anti-virus products are able to detect them as ‘Destroyed by Vienna. Reboot’. Such programs cannot be cleaned, they have to be deleted and reinstalled. It is possible for a user to have his own program to reboot the machine.
How do you know if a virus is running in the background?
- Programs shut down or start up automatically.
- Windows suddenly shuts down without prompting.
- Programs won’t start when you want them to.
- The hard drive is constantly working.
- Your machine is working slower than usual.
- Messages appear spontaneously.
Which was the first virus detected in 1987?
IBM computers were not alone: viruses were written for Apple Macintosh, Commodore Amiga, and Atari ST. In December 1987, the first major local network epidemic occurred:
the Christmas Tree Worm
, which was written in REXX spread on VM/CMS-9 operating systems.
What is rootkit virus?
The whole purpose of a rootkit is
to protect malware
. Think of it like an invisibility cloak for a malicious program. This malware is then used by cybercriminals to launch an attack. The malware protected by rootkit can even survive multiple reboots and just blends in with regular computer processes.
What is a tunneling virus?
A tunelling virus is a virus that
attempts to intercept anti-virus software
before it can detect malicious code. A tunneling virus launches itself under anti-virus programs and then works by going to the operating system’s interruption handlers and intercepting them, thus avoiding detection.
What is non resident virus?
Viruses propagate themselves by infecting applications on a host computer. A resident virus achieves this by infecting applications as they are opened by a user. A non-resident virus
is capable of infecting executable files when programs are not running.
