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Viruses, Worms, Trojan Horses
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Thread: Viruses, Worms, Trojan Horses

  1. #1
    Senior Member
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    Neer Springfield, MA


    Viruses, Worms, and Trojans For Dummies
    By CoolJsa14 + Microsoft

    Do you suspect you have a virus, worm, etc?


    A virus is code written with the express intention that the virus code replicates itself. A virus tries to spread itself from computer to computer by attaching itself to a host program. It may damage hardware, software, or data. A worm is a subclass of virus. A worm generally spreads without user action and distributes complete copies (possibly modified) of itself across networks. A worm can exhaust memory or network bandwidth, causing a computer to stop responding. A virus that appears to be a useful program, but that actually does damage, is a "trojan horse."

    Smart Prevention:

    There are three steps that you can take to start to improve the security of your Windows-based computer: use a firewall, receive regular updates, and use antivirus software. For step-by-step instructions that explain how to do this for your operating system, visit the following Microsoft Protect Your PC Web site: www.microsoft.com/protect
    On a Windows XP-based computer, the Protect Your PC Web site can automatically detect and configure Internet Connection Firewall (ICF), configure Automatic Updates settings, and provide information about antivirus software. On a Windows XP Service Pack 2 computer, Internet Connection Firewall (ICF) is renamed as "Windows Firewall (WF)."


    If you suspect or confirm that your computer is infected with a virus, obtain current antivirus software. When a virus infects your e-mail or other files, it may have the following effects on your computer:
    ? The infected file may make copies of itself. This may use all the free space in your hard disk.

    ? A copy of the infected file may be sent to all the addresses in your e-mail address list.
    ? The virus may reformat your disk drive and delete your files and programs.
    ? The virus may install hidden programs, such as pirated software. This pirated software may then be distributed and sold from your computer.
    ? The virus may reduce security. This could allow intruders to remotely access your computer or network.
    The following symptoms are frequently caused by or associated with a virus:
    ? You received an e-mail message that has a strange attachment. When you open the attachment, dialog boxes appear or a sudden degradation in system performance occurs.
    ? There is a double extension on an attachment that you recently opened, such as .jpg.vbs or .gif.exe.
    ? An antivirus program is disabled for no reason and it cannot be restarted.
    ? An antivirus program cannot be installed on the computer or it will not run.
    ? Strange dialog boxes or message boxes appear onscreen.
    ? Someone tells you that they have recently received e-mail messages from you containing attached files (especially with .exe, .bat, .scr , and .vbs extensions) that you did not send.
    ? New icons appear on the desktop that you did not put there, or are not associated with any recently installed programs.
    ? Strange sounds or music plays from the speakers unexpectedly.
    ? A program disappears from the computer, but you did not intentionally remove it.
    A virus infection may also cause the following symptoms, but these symptoms may also be the result of ordinary Windows functions, or problems in Windows that is not caused by a virus.
    ? Windows will not start at all, even though you have not made any system changes, and you have not installed or removed any programs.

    ? There is much modem activity. If you have an external modem, you may notice the lights blinking too much when the modem is not being used. You may be unknowingly supplying pirated software.
    ? Windows will not start because certain critical system files are missing, and then you receive an error message that lists the missing files.
    ? The computer sometimes starts as expected, but at other times it stops responding before the desktop icons and taskbar appear.
    ? The computer runs very slowly, and it takes a long time to start.
    ? You receive out-of-memory error messages even though your computer has much RAM.
    ? New programs do not install correctly.
    ? Windows spontaneously restarts unexpectedly.
    ? Programs that used to run stop responding frequently. If you try to remove and reinstall the software, the issue continues to occur.
    ? A disk utility such as Scandisk reports multiple serious disk errors.
    ? A partition disappears.
    ? Your computer always stops responding when you try to use Microsoft Office products.
    ? You cannot start Windows Task Manager.
    ? Antivirus software indicates that a virus is present.

    Recovering and Preventing:

    1. Use an Internet firewall.
    A firewall is a piece of software or hardware that creates a protective barrier between your computer and potentially damaging content on the Internet. It helps guard your computer against malicious users and many computer viruses and worms.

    Use a firewall only for network connections that you use to connect directly to the Internet. For example, use a firewall on a single computer that is connected to the Internet directly by using a cable modem, a DSL modem, or a dial-up modem. If you use the same network connection to connect to both the Internet and a home or office network, use a router or firewall that prevents Internet computers from connecting to the shared resources on the home or office computers. Do not use a firewall on network connections that you use to connect to your home or office network unless the firewall can be configured to open ports only for your home or office network. If you connect to the Internet by using your home or office network, a firewall can be used only on the computer or the other device, such as a router, that provides the connection to the Internet. For example, if you connect to the Internet through a network that you manage, and that network uses connection sharing to provide Internet access to multiple computers, you can install or enable a firewall only on the shared Internet connection. If you connect to the Internet through a network that you do not manage, verify that your network administrator is using a firewall.

    Note If you use a firewall on all computers on your home or office network you may be not be able to browse (search) for other computers on your home or office network, and you may not be able to share files with other computers on your home or office network. Internet firewalls can prevent browsing and file sharing
    Windows XP; Windows Server 2003, Standard Edition; Windows Server 2003, Enterprise Edition
    If you are running Windows Server 2003, Standard Edition; Windows Server 2003, Enterprise Edition; or any version of Windows XP, you can use the ICF feature. For additional information about how to turn on ICF, click the following article numbers to view the articles in the Microsoft Knowledge Base:

    For additional information about ICF, visit the following Microsoft Web sites:
    Other versions of Windows
    For other versions of Windows, use Basic Firewall (for Windows Server 2003 servers running Routing and Remote Access), Microsoft Internet Security and Acceleration (ISA) Server 2000 (for Windows 2000 or Windows Server 2003), or a third-party hardware or software firewall. For additional information about 3rd party firewall products, visit the following Microsoft Web site:
    2. Update your computer.
    Security updates help shield your computer from vulnerabilities, viruses, worms, and other threats as they are discovered. Steps that you can take include:a. Install security updates for Windows and Windows components (such as Internet Explorer, Outlook Express, and Windows Media Player). To do this, visit the following Microsoft Web site:
    Windows Update
    How to keep your Windows computer up-to-date
    Note Microsoft Windows NT Workstation, Windows 98, Windows 98 Second Edition, and Windows 95 have reached the ends of their product support life cycles. Updates that were provided for these operating systems are available on an archived basis on the Windows Update site. However, Microsoft no longer offers technical support for these releases. Because of this, consider upgrading to Windows XP Professional or Windows XP Home Edition so that you can take advantage of Automatic Updates and other security features that have been introduced since these older operating systems were released.
    b. To install security updates for Microsoft Office products, visit the following Office Update Microsoft Web site:
    c. To install security updates for your other programs, contact the manufacturer of the program for additional information. To locate security updates for other Microsoft products, visit the following Microsoft Web site:
    For example, you can locate security updates for Microsoft Internet Information Services (IIS), SQL Server, or Exchange Server at this Web site.

    Note Network administrators can use the Microsoft Baseline Security Analyzer (MBSA) tool to centrally scan Windows-based computers for common security misconfigurations and generate individual security reports for each computer that it scans. MBSA runs on computers that run Windows Server 2003, Windows 2000, and Windows XP. MBSA can scan for security vulnerabilities on computers that run Windows NT 4.0, Windows 2000, Windows XP, and Windows Server 2003. MBSA scans for common security misconfigurations in Windows, Internet Information Services (IIS), SQL Server, Internet Explorer, and Microsoft Office. MBSA also scans for missing security updates in Windows, IIS, SQL Server, Internet Explorer, Windows Media Player, Exchange Server, and Exchange 2000 Server.

    d. If you are running Microsoft Outlook before version 2002, make sure that the Microsoft Outlook E-mail Security Update is installed:
    ? By default, Outlook 2000 post-SP2 and Outlook 2002 SP1 include this security update.
    ? Outlook 2000 pre-SR1 and Outlook 98 do not include this functionality, but you can obtain it by installing the Outlook E-mail Security Update. For more information about the Outlook E-mail Security Update, visit the following Microsoft Web site:

    e. If you are running Outlook Express, use caution when you open e-mail attachments.
    ? By default, Outlook Express 6 SP1 blocks access to attachments.
    ? Earlier versions of Outlook Express (pre-Outlook Express 6) do not contain attachment-blocking functionality. Use extreme caution when you open unsolicited e-mail messages with attachments.

    f. Disable Active Scripting in Outlook and Outlook Express.

    Note By default, Active Scripting is disabled in Outlook Express 6 and Outlook 2002 and later. For additional information about how to disable active scripting in Outlook Express, click the following article number to view the

    3. Use current antivirus software.
    Microsoft does not provide software that can detect or remove computer viruses. If you suspect or confirm that your computer is infected with a virus, obtain current antivirus software.
    Antivirus software helps protect your computer against most viruses, worms, trojans, and other malicious programs. Many computers come with antivirus software installed. You can also purchase antivirus software and install it yourself. You must also keep your antivirus software up to date.

    ? If you do not have an antivirus program installed, Trend Micro, Inc. offers a free online virus scanning service at the following Trend Micro Web site:
    ? If your antivirus program has stopped working, reinstall it.
    ? Obtain the latest virus signature file from your antivirus vendor's Web site. For each new virus, antivirus vendors issue updates as inoculants against new viruses.
    ? After a virus has been removed, scan your computer again to make sure that the virus has been removed. Schedule your antivirus program to check your system while you sleep.
    ? You may have to format your computer?s hard disk and reinstall Windows and all your computer programs if one or more of the following conditions are true:
    ? Your antivirus software displays a message that it cannot fix or remove the virus.
    ? The virus damaged or deleted some of the important files on your computer. This may be the case if Windows or some of the programs do not start, or if they start with error messages that indicate that you have damaged or missing files
    ? The symptoms that are described in this article persist even after you clean your workstation and you are sure the problems are caused by a virus.

    Antivirus Information

    Virus Protection Strategies for IT Professionals

    Microsoft Product Support Security Response Team Virus Alerts


    Take care of your computer, and keep it safe from viruses that could really agrivate your life.

    I left some stuff out and put some stuff in, so if you want to look at the full thing, click here. There are also many other links for more support, and firewall downloads, etc.
    "If you enjoy what you do, you'll never work another day in your life."

    My man confucius said it well :D

    Why is my signature text blue I did not make it like that??

  2. #2
    Join Date
    Aug 2004
    Toronto, Canada
    Good stuff! Thanks Cools!

  3. #3
    Join Date
    Jan 2005
    Very nice guide, but Coolj give credit to the website, not to yourself

  4. #4
    Senior Member
    Join Date
    Jan 2005
    Neer Springfield, MA
    Originally posted by Waka-Gashira@Jan 4 2005, 09:50 PM
    Very nice guide, but Coolj give credit to the website, not to yourself*
    i reworded some of it .......ok credit to microsoft in title now...
    "If you enjoy what you do, you'll never work another day in your life."

    My man confucius said it well :D

    Why is my signature text blue I did not make it like that??

  5. #5
    Join Date
    Jan 2005
    A trojan is'nt actually a virus, and doesnt have to be in a program thats usefull and mainly doesnt cause damage.

  6. #6
    Senior Member RickDev's Avatar
    Join Date
    Jul 2005
    Melbourne, Florida
    Source: Webopedia

    The Difference Between a Virus, Worm and Trojan Horse?

    The most common blunder when the topic of a computer virus arises is that people will often refer to a Worm or Trojan Horse as a Virus. While the words Trojan, worm, and virus are used interchangeably, they are not the same. Viruses, worms, and Trojan Horses are all malicious programs that can cause damage to your computer, but there are differences between the three, and knowing those differences can help you to better protect your computer from their often damaging effects.

    A computer virus attaches itself to a program or file so it can spread from one computer to another, leaving infections as it travels. Much like human viruses, computer viruses can range in severity; some viruses cause only mildly annoying effects while others can damage your hardware, software, or files. Almost all viruses are attached to an executable file, which means the virus may exist on your computer but it cannot infect your computer unless you run or open the malicious program. It is important to note that a virus cannot be spread without a human action, (such as running an infected program) to keep it going. People continue the spread of a computer virus, mostly unknowingly, by sharing infecting files or sending e-mails with viruses as attachments in the e-mail.

    A worm is similar to a virus by its design, and is considered to be a sub-class of a virus. Worms spread from computer to computer, but unlike a virus, it has the ability to travel without any help from a person. A worm takes advantage of file or information transport features on your system, which allows it to travel unaided. The biggest danger with a worm is its ability to replicate itself on your system, so rather than your computer sending out a single worm, it could send out hundreds or thousands of copies of itself, creating a huge devastating effect. One example would be for a worm to send a copy of itself to everyone listed in your e-mail address book. Then, the worm replicates and sends itself out to everyone listed in each of the receiver's address book, and the manifest continues on down the line. Due to the copying nature of a worm and its ability to travel across networks the end result in most cases is that the worm consumes too much system memory (or network bandwidth), causing Web servers, network servers, and individual computers to stop responding. In more recent worm attacks such as the much talked about .Blaster Worm., the worm has been designed to tunnel into your system and allow malicious users to control your computer remotely.

    A Trojan Horse is full of as much trickery as the mythological Trojan Horse it was named after. The Trojan Horse, at first glance will appear to be useful software but will actually do damage once installed or run on your computer. Those on the receiving end of a Trojan Horse are usually tricked into opening them because they appear to be receiving legitimate software or files from a legitimate source. When a Trojan is activated on your computer, the results can vary. Some Trojans are designed to be more annoying than malicious (like changing your desktop, adding silly active desktop icons) or they can cause serious damage by deleting files and destroying information on your system. Trojans are also known to create a backdoor on your computer that gives malicious users access to your system, possibly allowing confidential or personal information to be compromised. Unlike viruses and worms, Trojans do not reproduce by infecting other files nor do they self-replicate.
    Combating Viruses, Worms and Trojan Horses

    The first steps to protecting your computer are to ensure your operating system (OS) is up-to-date. This is essential if you are running a Microsoft Windows OS. Secondly, you should have anti-virus software installed on your system and ensure you download updates frequently to ensure your software has the latest fixes for new viruses, worms, and Trojan Horses. Additionally you want to make sure your anti-virus program has the ability to scan e-mail and files as they are downloaded from the Internet. This will help prevent malicious programs from even reaching your computer. If this isn't enough protection, then you may want to consider installing a firewall as well.

    A firewall is a system which prevents unauthorized use and access to your computer. A firewall can be either hardware or software. Hardware firewalls provide a strong degree of protection from most forms of attack coming from the outside world and can be purchased as a stand-alone product or in broadband routers. Unfortunately, when battling viruses, worms and Trojans, a hardware firewall may be less effective than a software firewall, as it could possibly ignore embedded worms in out going e-mails and see this as regular network traffic. For individual home users, the most popular firewall choice is a software firewall. A good software firewall will protect your computer from outside attempts to control or gain access your computer, and usually provides additional protection against the most common Trojan programs or e-mail worms. The downside to software firewalls is that they will only protect the computer they are installed on, not a network.

    It is important to remember that on its own a firewall is not going to rid you of your computer virus problems, but when used in conjunction with regular operating system updates and a good anti-virus scanning software, it will add some extra security and protection for your computer or network.
    "Nobody knows what I do until I stop doing it."

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  7. #7
    great info. 4 me. Fed up of these viruses!

  8. #8
    Advisor beezlebubsbum's Avatar
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    are people actually posting in these forums, or are they just bots or something?
    My Website: http://ttgale.com
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  9. #9
    Join Date
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    Ontario, Canada
    Quote Originally Posted by beezlebubsbum View Post
    are people actually posting in these forums, or are they just bots or something?
    Well I actually knew RickDev but hes been awol since feb. 08

  10. #10
    Advisor beezlebubsbum's Avatar
    Join Date
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    seems a lot of people are awol, sad really
    My Website: http://ttgale.com
    My Website Uptime: http://img.uptimeprj.com/holastickbo...dee9bae2e2.png
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    My Gaming PC: Intel Core 2 Duo 2.93ghz, 4gb DDR2 RAM, 9800GTX+

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