Modern Diseases: Computer Viruses and Virus Treatment
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By Ted Jockey
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Computer Virus and Computer Worms and Definitions
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Here is the difference between Virus, Worms and a Trojan Horse
Trojan Horse
Trojan horses are impostors—files that claim to be something desirable but, in fact, are malicious. A very important distinction between Trojan horse programs and true viruses is that they do not replicate themselves. Trojan horses contain malicious code that when triggered cause loss, or even theft, of data. For a Trojan horse to spread, you must invite these programs onto your computers; for example, by opening an email attachment or downloading and running a file from the Internet. Trojan.Vundo is a Trojan horse.
Worms
Worms are programs that replicate themselves from system to system without the use of a host file. This is in contrast to viruses, which requires the spreading of an infected host file. Although worms generally exist inside of other files, often Word or Excel documents, there is a difference between how worms and viruses use the host file. Usually the worm will release a document that already has the "worm" macro inside the document. The entire document will travel from computer to computer, so the entire document should be considered the worm W32.Mydoom.AX@mm is an example of a worm
Computer Virus
A computer virus is a small program written to alter the way a computer operates, without the permission or knowledge of the user. A virus must meet two criteria:
It must execute itself. It often places its own code in the path of execution of another program.
It must replicate itself. For example, it may replace other executable files with a copy of
the virus infected file. Viruses can infect desktop computers and network servers alike.
Some viruses are programmed to damage the computer by damaging programs, deleting files, or reformatting the hard disk. Others are not designed to do any damage, but simply to replicate themselves and make their presence known by presenting text, video, and audio messages. Even these benign viruses can create problems for the computer user. They typically take up computer memory used by legitimate programs. As a result, they often cause erratic behavior and can result in system crashes. In addition, many viruses are bug-ridden, and these bugs may lead to system crashes and data loss.
At the end of the list of PC Virus, Trojans and Worms is a list of the Five Types of Viruses. Symantec AntiVirus can detect and clean, from your PC, any Virus, Trojan or Worm on this list. This article is detailed in full on the Symantec Home Page.
Virus Threats starting with “E”
- E-Flu
Hoax
- EasySpywareKiller
Other
- eBook
Hoax
- Eco.B
Virus
- Economic Slow Down Hoax
Hoax
- Eddy.1386
Virus
- Edwin
Virus
- Eek (b)
Virus
- Eharm.225
Virus
- EIC.Trojan
Trojan Horse
- Eicar Test String
Virus
- Elecciones 2000
Hoax
- ELECCIONES 2006
Hoax
- Emperor
Virus
- End_of.566
Virus
- EPOC.Alone.Joke
Joke
- EPOC.Disowner.Joke
Joke
- EPOC.Fake.Joke
Joke
- EPOC.FalseAlarm.Joke
Joke
- EPOC.Ghost.Joke
Joke
- EPOC.Lights.Joke
Joke
- EPOC.Nice.Joke
Joke
- EPOC.Sprite.Joke
Joke
- Ericsson Free Phone Hoax
Hoax
- ErrorSafe
Other
- ETDScanner
Other
- Eumel.383
Virus
- EVIL THE CAT Virus Hoax
Hoax
- Exe_Bug.A
Virus
- Exe_Bug.C
Virus
- Exe_Bug.Hooker
Virus
Five recognized types of viruses
File infector viruses
File infector viruses infect program files. These viruses normally infect executable code, such as .com and .exe files. The can infect other files when an infected program is run from floppy, hard drive, or from the network. Many of these viruses are memory resident. After memory becomes infected, any noninfected executable that runs becomes infected. Examples of known file infector viruses include Jerusalem and Cascade.
Boot sector viruses
Boot sector viruses infect the system area of a disk; that is, the boot record on floppy disks and hard disks. All floppy disks and hard disks (including disks containing only data) contain a small program in the boot record that is run when the computer starts up. Boot sector viruses attach themselves to this part of the disk and activate when the user attempts to start up from the infected disk. These viruses are always memory resident in nature. Most were written for DOS, but, all PCs, regardless of the operating system, are potential targets of this type of virus. All that is required to become infected is to attempt to start up your computer with an infected floppy disk Thereafter, while the virus remains in memory, all floppy disks that are not write protected will become infected when the floppy disk is accessed. Examples of boot sector viruses are Form, Disk Killer, Michelangelo, and Stoned.
Master boot record viruses
Master boot record viruses are memory-resident viruses that infect disks in the same manner as boot sector viruses. The difference between these two virus types is where the viral code is located. Master boot record infectors normally save a legitimate copy of the master boot record in an different location. Windows NT computers that become infected by either boot sector viruses or master boot sector viruses will not boot. This is due to the difference in how the operating system accesses its boot information, as compared to Windows 98/Me. If your Windows NT systems is formatted with FAT partitions you can usually remove the virus by booting to DOS and using antivirus software. If the boot partition is NTFS, the system must be recovered by using the three Windows NT Setup disks. Examples of master boot record infectors are NYB, AntiExe, and Unashamed.
Multipartite viruses
Multipartite (also known as polypartite) viruses infect both boot records and program files. These are particularly difficult to repair. If the boot area is cleaned, but the files are not, the boot area will be reinfected. The same holds true for cleaning infected files. If the virus is not removed from the boot area, any files that you have cleaned will be reinfected. Examples of multipartite viruses include One_Half, Emperor, Anthrax and Tequilla.
Macro viruses
These types of viruses infect data files. They are the most common and have cost corporations the most money and time trying to repair. With the advent of Visual Basic in Microsoft's Office 97, a macro virus can be written that not only infects data files, but also can infect other files as well. Macro viruses infect Microsoft Office Word, Excel, PowerPoint and Access files. Newer strains are now turning up in other programs as well. All of these viruses use another program's internal programming language, which was created to allow users to automate certain tasks within that program. Because of the ease with which these viruses can be created, there are now thousands of them in circulation. Examples of macro viruses include W97M.Melissa, WM.NiceDay and W97M.Groov.
Other resources for PC Virus Tools include:
AntiVirus Shareware
Shareware Download Reviews
Five Star Shareware Reviews
Major Geek Anti Virus Shareware Reviews
Hundreds of Software Shareware Reviews
Our Personal Choices
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Reg Run is great for identifying Adware
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