------ acquaintance of malicious code of a computer virus

Computer viruses (Computer Virus) is the code function or destruction of computer data compilers inserted in a computer program, can affect the computer, a set of computer instructions or program code for self-replicating.
Computer Virus features: spread, procedural, destructive, unauthorized, concealment, latent, can trigger, unpredictability.
The life cycle of computer viruses: latent phase propagation phase --- --- --- stage trigger the onset stage.
Transmission of computer viruses:
1, by floppy disk, on CD-ROM
2, spread through removable storage devices
3, spread through the network (LAN, e-mail, all kinds of instant messaging software, the use of various types of browser vulnerabilities, P2P download channels, all kinds of software download site, all kinds of application software vulnerabilities, all kinds of loopholes in the system, ARP spoofing, wireless devices spread)
multiple state computer viruses:
static virus: present on the secondary storage medium of computer viruses
dynamic virus: a computer into the computer's memory virus, run run or start mechanism of the virus with the host system and run.
There are two states in memory dynamically viruses: an active state and an active state can.
You can activate state: When the virus code in memory to be executed by the normal operation of the mechanism of the system, the virus is in the dynamic state can be activated.
Active state: when the system is executing the virus code, dynamic virus in the active state.
There is also a memory viral ---- is more special live births state, such a state does not occur under normal circumstances. His appearance is generally due to the intervention of the user of the virus (using antivirus software or manual methods). In memory of the virus code can not be executed normal system operation mechanism.
Windows environment common types of computer viruses:
1, the virus file format of PE at all WindowsPE virus infection Windows.
PE virus infection ways: the traditional infection bundled copy of infection infection infection overlay
2, the script virus using .asp .html .vbs .js and other types of files based on the dissemination of VB Script and Java Script scripting language by WSH (Windows script host) to explain the implementation of a class of virus.
The type of script viruses are more common is the VBS script virus
characteristics script viruses: Write simple damage is great and strong infection spread range of large virus source code easily obtain fraudulent oblige virus production mechanism is very easy to implement
3, macro viruses
use the macro programming language that can run on a number of data processing systems (primarily Microsoft's Office software, word processing, spreadsheets and other Office programs)