I will leave the shared folder open for you to download or change the presentations. However, I am not planning to move any more slides over from the computer software presentation. There are still a few topics unfilled but I will leave them till after the the other slides are posted.
I have also created a template for the software development process. Please start to fill this in as part of your revision process.
Some anti-virus software is memory resident and loaded on start up. It then actively monitors systems and programs that are ran, for infections. Such examples include boot files, discs and files which are accessed during start-up
Some more sophisticated antivirus software uses heuristic analysis to identify new malware or variants of known malware.
Many viruses start as a single infection and through either mutation or refinements by other attackers, can grow into dozens of slightly different strains, called variants. Generic detection refers to the detection and removal of multiple threats using a single virus definition
This is a unique pattern of bits within a virus code.
The anti-virus software searches for the presence of the virus signature and may remove it.
The simplest example is that a virus needs to modify a file by overwriting or adding its code to the file, so that when the file is running, so is the code for the virus. The integrity of the checksum method consists of taking a checksum of clean files or disks. Any change to the checksum indicates that the files or disks have been modified by what could be a virus.
A Trojan horse, or Trojan, is a non-self-replicating type of malware which appears to perform a desirable function but instead facilitates unauthorized access to the user’s computer system. Trojans do not attempt to inject themselves into other files like a computer virus. Trojan horses may steal information, or harm their host computer systems.
A worm is a virus which spreads from computer to computer, normally through security holes inside a network, which is able to reproduce itself.
Worms usually spread themselves by attaching copies of themselves, sometimes using email documents. The virus then uses these to move around to other servers emails and from there to users system.
A virus is a self replicating program that can destroy or cause damage to data stored on a computer system.
A virus program must be executed in order to infect a computer system. Viruses can attach themselves to other programs in order to ensure that this happens. Viruses are spread through file downloads or infected storage media such as floppy disks.
Common symptoms of virus infection:
Delivery is the method by which the virus arrives on the computer. The main vectors are boot sector, email, IM, network or infected file.
The virus may be deliberately introduced to the computer or the infection may be accidental.
A macro virus is a computer virus that “infects” a Microsoft Word or similar application and causes a sequence of actions to be performed automatically when the application is started or something else triggers it. Macro viruses tend to be surprising but relatively harmless. A typical effect is the undesired insertion of some comic text at certain points when writing a line. A macro virus is often spread as an e-mail virus. A well-known example in March, 1999 was the Melissa virus virus.
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