Preventing Computer a Computre Virus from Infecting Your Computer
Posted by Dave | Posted in Uncategorized | Posted on 30-11-2011-05-2008
0
Computer Viruses: Prevent Them from Infecting Your System
Like viruses that infect living beings, computer viruses infect your computer. They are software, and are often attached to other software or documents you might receive. When you run the virus’s software or the file the virus has infected, the virus can infect your computer’s software.
There are many types of viruses. Many computer viruses are malicious — in other words, they can erase your files or lock up entire computer systems. Others are more benign — they don’t directly damage, other than by spreading themselves locally or throughout the Internet.
Computer viruses are designed to spread from your computer to other computers. Here are some of the most common ways they spread:
• If a virus infects your system, it may automatically send out emails containing more copies of the virus using the address book in your email program. This type of virus is called an Internet “worm,” because it is a self-propagating virus. Viruses like these can slow down your computer’s operation dramatically.
• If the virus is a macro virus (attached to a Microsoft Word document, for example), it may attach itself to any document you create or modify. If you send another document to someone by email, the virus goes along with it.
• “Fun” programs, such as electronic greeting cards, can secretly infect your system. If you pass the program along, not realizing that it contains a virus, you will be transmitting the virus manually to your friends, family, or colleagues.
• Some viruses can release confidential data such as credit card information, account numbers, and passwords by emailing it to random email addresses or the address of the virus writer.
• Some viruses plant monitoring software or change security settings that allow hackers to enter your computer without you knowing about it and steal information or control it. http://www.scambusters.org/Scambusters38.html
How to Protect Your Computer from Viruses
Viruses are here—and here to stay. New ones pop up almost every day. These tips will prevent most viruses from ever affecting your computer:
1. Beware of unexpected or unsolicited email attachments
Because email is one of the primary ways to exchange information among Internet users, it is also a key method for spreading viruses. A basic plain text email is unable to transmit most viruses. It is the attachment to the email that contains the potential hazard. If the attachment is unexpected or unsolicited and from an unknown sender, the wisest decision would be to delete the email without opening the attachment. If the email is from a known and trusted source, but you did not expect an attached file from that source, you may want to contact the sender to confirm that the attachment is legitimate.
2. Use an anti-virus program to regularly scan your hard drive
Even when you exercise reasonable caution, you may still be infected by a virus. An anti-virus program can be set up to regularly check your computer or even your incoming email attachments for viruses. This kind of program may even be able to constantly run in the background as you go about your work. Because viruses are being constantly created or changed, it is important to use a program that provides regular updates.
3. Use an anti-virus program to scan all incoming email attachments and all files or programs that came from someone else’s computer
Whenever someone puts a file or a program on their computer, there is always some risk that some virus may infect that file or program and remain undetected. By scanning all incoming files and programs, you may uncover a virus that someone else may have overlooked.
4. Update your anti-virus program regularly
New or improved viruses are regularly popping up on the Internet. Updating your anti-virus software will decrease the likelihood that you are affected by a new type of virus.
5. Back up your data files on a regular basis
In a worst case scenario, a virus may corrupt or destroy data on one or more files. Regular backups will allow you to recover more easily in the event that a virus damages your files.
6. Purchase or obtain files or software only from trusted sources
Don’t buy software whose price is suspiciously lower than manufacturer’s prices. It’s likely not an authorized copy and may be virus-laden. This tip includes software or files that are downloaded over the Internet.
7. Avoid forwarding email attachments unless you first scan the attachment for viruses
If you have an anti-virus program that scans all incoming email attachments, or if you scan the attachment after it arrives, then it is probably safe to forward the attachment. Otherwise, do not forward the attachment.
8. Look for an unexpected file extension on any attachment
If the subject line or the body of an email states that the attachment is a certain type of file or if the file icon implies a certain type of file and the file extension does not match, delete the file.
9. Data files will not carry viruses
A file that contains only data will not carry a virus since a virus has to have some kind of executable code. For example, files ending with the extension .txt, .gif, .jpg, .mp3, are common data files that would not have executable code. Files ending in .doc, .xls, .and exe. may have executable code and could potentially carry a virus.
10. Write-protect floppy disks that will be used in a read only mode
If you are sharing data that resides on disks or other portable storage media use the write-protect tab to prevent an accidental insertion of a virus.
11. Install security patches. Vulnerabilities in software are constantly being discovered and they don’t discriminate by vendor or platform. It’s not simply a matter of updating Windows; at least monthly, check for and apply updates for all software you use.
12. Use a firewall. No Internet connection is safe without one. Firewalls are necessary even if you have a dial-up Internet connection — it takes only minutes for a non-firewalled computer to be infected.
13. Take control of your email. Avoid opening email attachments received unexpectedly. Remember that most worms and Trojan-laden spam try to spoof the sender’s name. And make sure your email client isn’t leaving you open to infection. Reading email in plain text offers important security benefits that more than offset the loss of pretty colored fonts.
14. Treat IM suspiciously. Instant Messaging is a frequent target of worms and Trojans. Treat it just as you would email.
15. Keep abreast of Internet scams. Criminals think of clever ways to separate you from your hard earned cash. Don’t get fooled by emails telling sad stories, or making unsolicited job offers, or promising lotto winnings. Likewise, beware of email masquerading as a security concern from your bank.
16. Don’t fall victim to virus hoaxes. Dire-sounding email spreading fear, uncertainty and doubt about non-existent threats serve only to spread needless alarm and may even cause you to delete perfectly legitimate files in response.
http://antivirus.about.com/od/securitytips/a/safetytips.htm
http://www.speedbrake.com/security/viruses.htm
Determining If Your Computer Is Infected
How do you know if you have a computer virus? If you’re not running an antivirus program, you may not know at all since many viruses are benign.
Symptoms of a virus infection include:
–Your computer displays strange messages, plays music, or shows odd graphic displays.
–Your computer takes longer to boot up, operates more slowly than usual, and takes longer to start programs.
–Your computer has much less memory or hard drive space available.
Some legitimate software can cause these symptoms, so the only way you can be sure your computer is virus-free is to regularly scan it for viruses using antivirus software.
How Can You Protect Your Computer From Viruses?
Anti-virus software is essential—budget it into the costs of your computer. Otherwise disaster could happen.
After installing the antivirus software, download regular updates. Most antivirus software comes with a year’s worth of updates, and you can usually set the software to either automatically download the updates, or display a reminder for you to do so. Don’t shirk this vital responsibility—500 new viruses are discovered every month.
Norton AntiVirus and McAfee VirusScan are the two best-known antivirus programs for the Microsoft Windows operating systems. For Macintosh users, Norton AntiVirus and McAfee’s Virex for Macintosh provide protection.
All antivirus software scans a computer’s memory and hard drive for viruses. Depending on the software package, the antivirus program may also be able to protect against:
• Incoming emails and email attachments with viruses.
• Viruses received through instant messaging, such as ICQ.
• Infected downloaded files, before you open the file.
• Attacks against your computer from outside (firewall software).
If you are strapped for cash, AVG Anti-Virus provides a free version of its antivirus program and free updates for Windows-based computers. And if you just want to scan your computer for viruses for free right now, check out Trend Micro’s free online virus scan and McAfee FreeScan.
http://www.scambusters.org/anti-virus.html
Fake Anti-virus, Anti-spyware Programs
Fake virus alerts are usually generated by a Trojan — a program that takes control of your computer — after you open an email attachment, click on a pop-up advertisement or visit a particular website. (adult sites especially).
Scammers want to scare you into buying “rogue” security software by making you think your computer is infected. (”Rogue” means software of unknown or questionable origin, or doubtful value.). In fact, fake “virus alerts” often mimic ones displayed by brand-name products.
Sometimes, a Trojan creates “false positive” readings, making you think viruses and spyware have infected your computer, even though nothing has. In other cases, scam software actually implants malicious code into your computer, especially if you request a “free virus scan.”
In other words, some peddlers of fake anti-virus software actually design the viruses, spyware and malware that their software is supposed to detect!
For example: “Your Computer Has Been Infected!” That’s what some pop-ups and phony alerts will say, hoping you’ll download fake anti-virus software. Don’t be scammed!
Meanwhile, ID thieves will use the fake software to gather your personal and financial information–for their own ID theft scams or for sale to others.
Tell-tale Signs of Rogue Software
• Rogue anti-virus/spyware programs often generate more “alerts” than the software made by reputable companies.
• Being bombarded with pop-ups, even when you’re not online.
• High-pressure sales copy will try to convince you to buy immediately.
• If you’ve been infected, your computer may dramatically slow down.
• Other signs of infection include: new desktop icons; new wallpaper, or having your default homepage redirected to another site.
Fake Anti Virus Prevention Tips
1. Use Firefox as your browser rather than Internet Explorer.
2. Keep your computer updated with the latest anti-virus and anti-spyware software, and be sure to use a good firewall.
3. Never open an email attachment unless you are positive about the source.
4. Never click on any pop-up that advertises anti-virus or anti-spyware software, especially a program promising to provide every feature known to mankind. (Also remember: the fakes often mimic well-known brands such as AVG, Norton and McAfee.)
5. If a virus alert appears on your screen, do not touch it. Don’t use your mouse to eliminate or scan for viruses, and do not use your mouse to close the window. Instead, hit control + alt + delete to view a list of programs currently running. Delete the “rogue” from the list of running programs, and call your computer maker’s phone or online tech support service to learn if you can safely use your computer.
6. Do not download freeware or shareware unless you know it’s from a reputable source. Unfortunately, freeware and shareware programs often come bundled with spyware, adware or fake anti-virus programs.
7. Avoid questionable websites. Some sites may automatically download malicious software onto your computer.
8. Reset your current security settings to a higher level.
9. Although fake software may closely resemble the real thing, it’s rarely an exact match. Look for suspicious discrepancies. .
http://www.spywarewarrior.com/rogue_anti-spyware.html
If your computer is infected by rogue software, stop work and contact your computer manufacturer’s tech-support hotline. Don’t use the computer. This may further damage your machine and provide identity thieves with more of your information.
Use of fake anti-virus, anti-spyware software is a fast-growing scam, especially as more people become aware of the dangers of spyware, adware and malware. By following the tips above, however, you’ll better protect yourself from becoming the next victim of scammers, identity thieves and hackers. http://www.scambusters.org/fakeantivirus.html
Worms, Trojan Houses, Spyware and More
In addition to computer viruses, there are other dangers to navigate:
Worms are self-propagating computer viruses. A worm is a program or algorithm that replicates itself over a computer network and usually performs malicious actions, such as using up the computer’s resources and possibly shutting the system down. Their impact is similar to computer viruses.
Trojan Horses are closely related to computer viruses, but they differ in that they do not attempt to replicate themselves. More specifically, a Trojan horse performs some undesired — yet intended — action while, or in addition to, pretending to do something else. A common example is a fake login program, which collects account information and passwords by asking for this info just like a normal login program does.
The term comes from a story in Homer’s Iliad, in which the Greeks give a giant wooden horse to their foes, the Trojans, ostensibly as a peace offering. But after the Trojans drag the horse inside their city walls, Greek soldiers sneak out of the horse’s hollow belly and open the city gates, allowing their compatriots to pour in and capture Troy.
Spyware is software that tracks your actions and/or your Internet use. It can capture what you type on your keyword, including passwords, and send it to the spyware creator.
Spyware applications are typically bundled as a hidden component of freeware or shareware programs that can be downloaded from the Internet; however, it should be noted that the majority of shareware and freeware applications do not come with spyware. Once installed, the spyware monitors user activity on the Internet and transmits that information in the background to someone else. Spyware can also gather information about e-mail addresses and even passwords and credit card numbers.
Because spyware is using memory and system resources, the applications running in the background can lead to system crashes or general system instability.
Adware is a form of spyware that collects information about the user to display advertisements in the Web.
Every day viruses cause major PC crashes and allow private information to be stolen.
The inconvenience and cost of repairing this physical damage is considerable.
Yet it’s relatively simple to protect yourself. But many people never protect themselves as they should. That’s because installing security and safety precautions seems costly, technical and intimidating. So the vast majority of people don’t do it — with devastating consequences! http://www.scambusters.org/viruses.html
Why You Need a Firewall
Using a firewall is one of the most highly recommended security practices today. A good firewall, combined with up to date security patches and antivirus and antispyware software, will protect you from Internet scams and threats.
A firewall is a barrier that protects a computer from anyone who tries to access it from outside without authorization. It scans everything that goes through an Internet access point and filters it based on customized settings.
There are two firewall varieties — hardware and software. A hardware firewall is electronic equipment generally used by businesses with larger networks.
Most home users employ a software firewall, which is a program running on your computer that scans traffic going through an Internet connection and stops anything that looks suspicious. A hardware firewall is generally more secure, and since prices are coming down on them, some home users have chosen to set up one of these as well.
Why Do I Need A Firewall?
Independent tests show that without a firewall, a standard PC that is connected to the Internet can be compromised in 10 minutes.
In the past, businesses have generally been more concerned about protecting their information, but now home computer users should use a firewall as well, as Trojans and virus emails are so widespread.
For instance, if you have your financial records stored on your computer, someone could access them and get all your credit card and banking information.
Having a firewall installed does not mean you are permanently safe from any Internet attack. A firewall won’t always stop a virus email, or adware or spyware from attacking your computer.
To protect from these you need to have up to date antivirus software installed, and a good spyware checker running.
However, a good firewall will go a long way towards protecting your computer and all your personal information from unauthorized access. http://www.scambusters.org/firewall.html
Videos:
Avoid Computer Viruses: http://video.about.com/antivirus/Avoid-Computer-Viruses.htm
AVG: Free Antivirus Protection: http://videos.howstuffworks.com/computer/computer-virus-videos-playlist.htm#video-2738
Ten Worst Computer Viruses: http://videos.howstuffworks.com/computer/computer-virus-videos-playlist.htm#video-35442
Trojan Horses Explained: http://videos.howstuffworks.com/computer/computer-virus-videos-playlist.htm#video-3549
“Disinfecting” Your Computer—Resources: http://videos.howstuffworks.com/computer/computer-virus-videos-playlist.htm#video-698
Books:
Virus Defense: http://www.amazon.com/Art-Computer-Virus-Research-Defense/dp/0321304543
Virus Reference: http://www.amazon.com/Giant-Black-Book-Computer-Viruses/dp/0929408233
Surviving Viruses, Worms and Trojan Horses: http://books.google.com/books/about/Computer_Virus_Survival_Guide.html?id=Lj9Go6gjzuEC






INGREDIENTS


