February 12, 2010
THE HARMFUL PROGRAMS TYPES
THE HARMFUL PROGRAMS TYPES
Trojans
These are the most known viruses containing some code that after execution makes your PC vulnerable for remote entrance. Pseudo hackers use them to break into PCs. Some Trojans are capable in deleting important files on hard drive or even in formatting it. Most of times Trojans are not viruses themselves and are just mean of transportation of harmful programs to your PC.
Polymorph viruses
They hide their destructive code inside the infected file by several ways. This virus type is the hardest one for antivirus detection.
Stealth viruses
They are the resident viruses modification (are kept in core memory). Stealth falsifies info on your disk the way the receiving software gets false data. Let’s say when hiding from antivirus stealth sets the uninfected files making your antivirus to presume the truly infected the clear one. Stealth virus masks the way that is hard to detect so not every antivirus is able to detect it.
Parasite viruses
These viruses change files’ contents by adding their codes the way infected programs continue working good enough. The code may be integrated into the beginning, the middle part or the end of program and is executed before, together or after the program depending on its placement.
Overwriting viruses
They substitute the program code by its body without any names changing making the infected program never ran because when you run it you actually run the virus and not the program code. Let’s say the virus places the spot of your word pad so running the word pad you run the virus with your own hands.
Companion viruses
As the previous one substitutes the infected program but unlike the overwriter the companion does not delete the file but renames or misplaces it. When you run the program you first run the virus code and then your PC starts running the original program with an illusion of having no problems.
Retro-viruses
They do nothing but search for antiviruses on your hard drive and delete them with all their components.
Logical bombs
Activate at specified time deleting files.
Droppers
They secretly install viruses and Trojans to your PC and are hard to detect.
Worms
Worms are self-duplicating programs transmitted via local and global networks. Some of them would demand some user’s action (as opening an E-mail attachment) and some pick and attack computers automatically.
Boot viruses
They infect your hard drive of diskette boot sectors. As in early days transmitting of info from one PC to another was done with diskettes these viruses were everywhere leading to your hard drive data complete loss. They also do not depend on type of OS on your PC.
Direct action viruses
They just perform their destructive functions and leave your core memory.
Macro-viruses
They infect PCs by means macro-commands harming only Microsoft Word, Excel, Office, PowerPoint and Access files. They are easily distributed among inexperienced users. I once worked for state organization with staff over 20 people where all Microsoft Word files were infected with micro-viruses. Gosh, it’s 21st century now!
Cross platform viruses
These ones are dangerous for affect more than a single OS as usually the viruses damaging Windows may not work under let’s say Apple.
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Filed under Bug Fixes and Tips by softwaredude