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    Malware: Viruses, Spyware, Adware & Other Malicious Software

    This page provides an overview of the most common malware applications. For specific steps you can take to protect against malware, see our Protect Against Viruses & Security Threats pages. What is Malware? Malware is a catch-all term for various malicious software, including viruses, adware, spyware, browser hijacking software, and fake security software.

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    Malware: Viruses, Spyware, Adware & Other Malicious Software

    On This Page:

    What is Malware Types of Malware Facts about Malware

    How do I know if I have Malware on my computer?

    This page provides an overview of the most common malware applications. For specific steps you can take to protect against malware, see our Protect Against Viruses & Security Threats pages.

    What is Malware?

    Malware is a catch-all term for various malicious software, including viruses, adware, spyware, browser hijacking software, and fake security software.

    Once installed on your computer, these programs can seriously affect your privacy and your computer's security. For example, malware is known for relaying personal information to advertisers and other third parties without user consent. Some programs are also known for containing worms and viruses that cause a great deal of computer damage.

    Types of Malware

    Viruses which are the most commonly-known form of malware and potentially the most destructive. They can do anything from erasing the data on your computer to hijacking your computer to attack other systems, send spam, or host and share illegal content.Spyware collects your personal information and passes it on to interested third parties without your knowledge or consent. Spyware is also known for installing Trojan viruses.Adware displays pop-up advertisements when you are online.Fake security software poses as legitimate software to trick you into opening your system to further infection, providing personal information, or paying for unnecessary or even damaging "clean ups".Browser hijacking software changes your browser settings (such as your home page and toolbars), displays pop-up ads and creates new desktop shortcuts. It can also relay your personal preferences to interested third parties.

    Facts about Malware

    Malware is often bundled with other software and may be installed without your knowledge.

    For instance, AOL Instant Messenger comes with WildTangent, a documented malware program. Some peer-to-peer (P2P) applications, such as KaZaA, Gnutella, and LimeWire also bundle spyware and adware. While End User License Agreements (EULA) usually include information about additional programs, some malware is automatically installed, without notification or user consent.

    Malware is very difficult to remove.

    Malware programs can seldom be uninstalled by conventional means. In addition, they ‘hide’ in unexpected places on your computer (e.g., hidden folders or system files), making their removal complicated and time-consuming. In some cases, you may have to reinstall your operating system to get rid of the infection completely.

    Malware threatens your privacy.

    Malware programs are known for gathering personal information and relaying it to advertisers and other third parties. The information most typically collected includes your browsing and shopping habits, your computer's IP address, or your identification information.

    Malware threatens your computer’s security.

    Some types of malware contain files commonly identified as Trojan viruses. Others leave your computer vulnerable to viruses. Regardless of type, malware is notorious for being at the root, whether directly or indirectly, of virus infection, causing conflicts with legitimate software and compromising the security of any operating system, Windows or Macintosh.

    How do I know if I have Malware on my computer?

    Common symptoms include:

    Browser crashes & instabilities

    Browser closes unexpectedly or stops responding.

    The home page changes to a different website and cannot be reset.

    New toolbars are added to the browser.

    Clicking a link does not work or you are redirected to an unrelated website.

    Poor system performance

    Internet connection stops unexpectedly.

    Computer stops responding or takes longer to start.

    Applications do not open or are blocked from downloading updates (especially security programs).

    New icons are added to desktop or suspicious programs are installed.

    Certain system settings or configuration options become unavailable.

    Source : indiascreen.ir

    Malware: Viruses, Spyware, Adware & Other Malicious Software

    This page provides an overview of the most common malware applications. For specific steps you can take to protect against malware, see our Protect Against Viruses & Security Threats pages. What is Malware? Malware is a catch-all term for various malicious software, including viruses, adware, spyware, browser hijacking software, and fake security software.

    skip to content

    The University of Massachusetts Amherst

    Information Technology

    Services See all IT Services

    Services at a Glance

    Accounts Email

    Instructional Technologies

    Discounts

    Network Connectivity

    Online Storage & Collaboration

    Moodle Telephones SPIRE Web Hosting

    Classroom Technologies

    Policies Support Security Software About

    Malware: Viruses, Spyware, Adware & Other Malicious Software

    On This Page:

    What is Malware Types of Malware Facts about Malware

    How do I know if I have Malware on my computer?

    This page provides an overview of the most common malware applications. For specific steps you can take to protect against malware, see our Protect Against Viruses & Security Threats pages.

    What is Malware?

    Malware is a catch-all term for various malicious software, including viruses, adware, spyware, browser hijacking software, and fake security software.

    Once installed on your computer, these programs can seriously affect your privacy and your computer's security. For example, malware is known for relaying personal information to advertisers and other third parties without user consent. Some programs are also known for containing worms and viruses that cause a great deal of computer damage.

    Types of Malware

    Viruses which are the most commonly-known form of malware and potentially the most destructive. They can do anything from erasing the data on your computer to hijacking your computer to attack other systems, send spam, or host and share illegal content.Spyware collects your personal information and passes it on to interested third parties without your knowledge or consent. Spyware is also known for installing Trojan viruses.Adware displays pop-up advertisements when you are online.Fake security software poses as legitimate software to trick you into opening your system to further infection, providing personal information, or paying for unnecessary or even damaging "clean ups".Browser hijacking software changes your browser settings (such as your home page and toolbars), displays pop-up ads and creates new desktop shortcuts. It can also relay your personal preferences to interested third parties.

    Facts about Malware

    Malware is often bundled with other software and may be installed without your knowledge.

    For instance, AOL Instant Messenger comes with WildTangent, a documented malware program. Some peer-to-peer (P2P) applications, such as KaZaA, Gnutella, and LimeWire also bundle spyware and adware. While End User License Agreements (EULA) usually include information about additional programs, some malware is automatically installed, without notification or user consent.

    Malware is very difficult to remove.

    Malware programs can seldom be uninstalled by conventional means. In addition, they ‘hide’ in unexpected places on your computer (e.g., hidden folders or system files), making their removal complicated and time-consuming. In some cases, you may have to reinstall your operating system to get rid of the infection completely.

    Malware threatens your privacy.

    Malware programs are known for gathering personal information and relaying it to advertisers and other third parties. The information most typically collected includes your browsing and shopping habits, your computer's IP address, or your identification information.

    Malware threatens your computer’s security.

    Some types of malware contain files commonly identified as Trojan viruses. Others leave your computer vulnerable to viruses. Regardless of type, malware is notorious for being at the root, whether directly or indirectly, of virus infection, causing conflicts with legitimate software and compromising the security of any operating system, Windows or Macintosh.

    How do I know if I have Malware on my computer?

    Common symptoms include:

    Browser crashes & instabilities

    Browser closes unexpectedly or stops responding.

    The home page changes to a different website and cannot be reset.

    New toolbars are added to the browser.

    Clicking a link does not work or you are redirected to an unrelated website.

    Poor system performance

    Internet connection stops unexpectedly.

    Computer stops responding or takes longer to start.

    Applications do not open or are blocked from downloading updates (especially security programs).

    New icons are added to desktop or suspicious programs are installed.

    Certain system settings or configuration options become unavailable.

    Advertising

    Ads pop up even when the browser is not open.

    Browser opens automatically to display ads.

    New pages open in browser to display ads.

    Search results pages display only ads.

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    Related Topics

    Protect Against Viruses & Security Threats

    OnGuard Online Topics: Malware

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    Source : www.umass.edu

    What are malware, viruses, Spyware, and cookies, and what differentiates them ?

    What are malware, viruses, Spyware, and cookies, and what differentiates them? DigiCert helps consumers and organizations secure and manage their information-driven world.

    Defining Them

    Spyware

    Spyware is a type of program that is installed with or without your permission on your personal computers to collect information about users, their computer or browsing habits tracks each and everything that you do without your knowledge and send it to remote user. It also can download other malicious programs from internet and install it on the computer.Spyware works like adware but is usually a separate program that is installed unknowingly when you install another freeware type program or application.

    Trojans

    A Trojan horse is not a virus. It is a destructive program that looks as a genuine application. Unlike viruses, Trojan horses do not replicate themselves but they can be just as destructive. Trojans also open a backdoor entry to your computer which gives malicious users/programs access to your system, allowing confidential and personal information to be theft.

    Example: - JS.Debeski.Trojan

    Trojan horses are broken down in classification based on how they infect the systems and the damage caused by them. The seven main types of Trojan horses are:

    • Remote Access Trojans

    • Data Sending Trojans

    • Destructive Trojans

    • Proxy Trojans • FTP Trojans

    • Security software disabler Trojans

    • Denial-of-service attack Trojans

    Worms

    Worms are malicious programs that make copies of themselves again and again on the local drive, network shares, etc. The only purpose of the worm is to reproduce itself again and again. It doesn’t harm any data/file on the computer. Unlike a virus, it does not need to attach itself to an existing program. Worms spread by exploiting vulnerabilities in operating systems

    Examples of worm are:

    W32.SillyFDC.BBY Packed.Generic.236 W32.Troresba

    Due to its replication nature it takes a lot of space in the hard drive and consumes more CPU uses which in turn makes the pc too slow also consumes more network bandwidth.

    Following are different type of VirusFile Virus:This type of virus normally infects program files such as .exe, .com, .bat. Once this virus stays in memory it tries to infect all programs that load on to memory.Macro Virus: These type of virus infects word, excel, PowerPoint, access and other data files. Once infected repairing of these files is very much difficult.Master boot record files: MBR viruses are memory-resident viruses and copy itself to the first sector of a storage device which is used for partition tables or OS loading programs .A MBR virus will infect this particular area of Storage device instead of normal files. The easiest way to remove a MBR virus is to clean the MBR area,Boot sector virus: Boot sector virus infects the boot sector of a HDD or FDD. These are also memory resident in nature. As soon as the computer starts it gets infected from the boot sector.  Cleaning this type of virus is very difficult.Multipartite virus: A hybrid of Boot and Program/file viruses. They infect program files and when the infected program is executed, these viruses infect the boot record. When you boot the computer next time the virus from the boot record loads in memory and then start infecting other program files on diskPolymorphic viruses: A virus that can encrypt its code in different ways so that it appears differently in each infection. These viruses are more difficult to detect.Stealth viruses: These types of viruses use different kind of techniques to avoid detection. They either redirect the disk head to read another sector instead of the one in which they reside or they may alter the reading of the infected file’s size shown in the directory listing. For example, the Whale virus adds 9216 bytes to an infected file; then the virus subtracts the same number of bytes (9216) from the size given in the directory.Adware

    Generically adware is a software application in which advertising banners are displayed while any program is running. Adware can automatically get downloaded to your system while browsing any website and can be viewed through pop-up windows or through a bar that appears on a computer screen automatically. Adwares are used by companies for marketing purpose.

    Tracking cookies

    A cookie is a plain text file that is stored on your computer in a cookies folder and it stores data about your browsing session. Cookies are used by many websites to track visitor information A tracking cookie is a cookie which keeps tracks of all your browsing information and this is used by hackers and companies to know all your personal details like bank account details, your credit card information etc. which is dangerous.

    Spam

    Spamming is a method of flooding the Internet with copies of the same message. Most spams are commercial advertisements which are sent as an unwanted email to users. Spams are also known as Electronic junk mails or junk newsgroup postings. These spam mails are very annoying as it keeps coming every day and keeps your mailbox full.

    Misleading applications

    Misleading applications misguide you about the security status of your computer and shows you that your computer is infected by some malware and you have to download the tool to remove the threat. As you download the tool it shows some threats in your computer and to remove it you have to buy the product for which it asks some personal information like credit card information etc. which is dangerous.

    Source : www.websecurity.digicert.com

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    James 5 month ago
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