Virus Protection

I've been reading all the comments about not needing any other virus protection for my MacBook Pro 10.9.4 version. My Kaspersky Internet security is about to expire, so I don't need it? Will it still be safe to do internet banking?

1. You don't need it.
2. Yes, as long as you keep Mac OS X and your browser up to date, and ensure that all your banking websites use https.
(109821)

Similar Messages

I am getting an error message that my network connection has timed out. while trying to update my iPhone on iTunes. Has anyone found a solution? I was given some advice about turning off my firewall and/or virus protection but am nervous about doing that.

I get a message that my network connection has timed out while trying to update my iPhone on iTunes. Has anyone else had that problem and if so what solutions have you found? I was told to turn off my firewall and/or virus protection while updating but am nervous about doing that for obvious reasons. I'm also disgusted with Apple not providing free tech support.

See this article about the ports that have to be open during the update process. iTunes has to contact Apple during the download. iTunes for Windows: Troubleshooting security software issues

How to install when I keep getting the following massage on windows 7 64 bit with or with firewall on and vwith or with virus protection on here is post This installation package could net be opened verify that the package exist and that you can access

how to install when I keep getting the following massage on windows 7 64 bit with or with firewall on and with or with virus protection on here is post " This installation package could net be opened verify that the package exist and that you can access" same when trying to install quicktime

I'd first try downloading an installer from the Apple website using a different web browser:
http://www.apple.com/quicktime/download/
If you use Firefox instead of IE for the download (or vice versa), do you get a working installer?

Do I need to use a virus protection service such as McAfee with my Macbook Pro?

I would like to know if I need to use a virus protection service such as McAfee with my Macbook Pro. I understand Macs do not get viruses - is this correct?

McAfee has caused numerous problems for Mac users. This is the results of a forum search I just did.
https://discussions.apple.com/community/mac_os/search.jspa?peopleEnabled=true&us erID=&containerType=&container=&spotlight=true&q=McAfee
Macs are not vulnerable to a virus but they are malware.
http://www.reedcorner.net/guides/macvirus/
How to avoid or remove Mac Defender malware

What virus protection should i download for my macbook pro

i just got my macbook pro and want to know what virus protection program should i download for free

This comment applies to malicious software ("malware") that's installed unwittingly by the victim of a network attack. It does not apply to software, such as keystroke loggers, that may be installed deliberately by an attacker who has hands-on access to the victim's computer. That threat is in a different category, and there's no easy way to defend against it. If you have reason to suspect that you're the target of such an attack, you need expert help.
All versions of OS X since 10.6.7 have been able to detect known Mac malware in downloaded files. The recognition database is automatically updated once a day; however, you shouldn't rely on it, because the attackers are always at least a day ahead of the defenders. In most cases, there’s no benefit from any other automated protection against malware.
Starting with OS X 10.7.5, there is another layer of built-in malware protection, designated "Gatekeeper" by Apple. By default, applications that are downloaded from the network will only run if they're digitally signed by a developer with a certificate issued by Apple. Applications certified in this way haven't actually been tested by Apple (unless they come from the Mac App Store), but you can be sure that they haven't been modified by anyone other than the developer, and his identity is known, so he could be held responsible if he knowingly released malware. For most practical purposes, applications recognized by Gatekeeper as signed can be considered safe. Note, however, that there are some caveats concerning Gatekeeper:
It doesn't apply to software that comes packaged as an installer. Treat all third-party installers with caution.
It can be disabled or overridden by the user.
It can be bypassed by some third-party networking software, such as BitTorrent clients and Java applets (see below.)
It only applies to applications downloaded from the network. Software installed from a CD or other media is not checked.
For more information about Gatekeeper, see this Apple Support article.
Notwithstanding the above, the most effective defense against malware attacks is your own intelligence. All known malware on the Internet that affects a fully-updated installation of OS X 10.6 or later takes the form of so-called "trojan horses," which can only have an effect if the victim is duped into running them. If you're smarter than the malware attacker thinks you are, you won't be duped. That means, primarily, that you never install software from an untrustworthy source. How do you know a source is untrustworthy?
Any website that prompts you to install a “codec,” “plug-in,” or “certificate” that comes from that same site, or an unknown one, is untrustworthy.
A web operator who tells you that you have a “virus,” or that anything else is wrong with your computer, or that you have won a prize in a contest you never entered, is trying to commit a crime with you as the victim. [Some reputable websites did legitimately warn users who were infected with the "DNSChanger" malware. That exception to this rule no longer applies.]
“Cracked” copies of commercial software downloaded from a bittorrent are likely to be infected.
Software with a corporate brand, such as Adobe Flash Player, must be downloaded directly from the developer’s website. No intermediary is acceptable.
Java on the network (not to be confused with JavaScript, to which it's not related) is always a potential weak spot in the security of any operating system. If Java is not installed, don't install it unless you really need it. If it is installed, you should disable it (not JavaScript) in your web browsers. Few websites have Java content nowadays, so you won’t be missing much. This setting is mandatory in OS X 10.5.8 or earlier, because Java in those obsolete versions has known security flaws that make it unsafe to use on the Internet. The flaws will never be fixed. Regardless of version, experience has shown that Java can never be fully trusted, even if no vulnerabilities are publicly known at the moment.
Follow these guidelines, and you’ll be as safe from malware as you can reasonably be.
Never install any commercial "anti-virus" products for the Mac, as they all do more harm than good. If you need to be able to detect Windows malware in your files, use the free software ClamXav — nothing else.

Virus protection for my macbook pro

Does anybody know of a good Virus protection for my macbook pro? Some people say i dont need one is that true? I was hoping to get a cheap/reasonable priced protection for a lil extra help. Im worried about my laptop getting a virus.

Thomas A Reed wrote:
sigh. Discussions about anti-virus software here are a hot-button topic, and often cause virtual fistfights. Not your fault, of course, but now there's a lot of confusing information being thrown back and forth here. Let me try to clear the air a bit.
First, regarding ClamXav, Kappy's link is fine, but I would refer you straight to the official ClamXav site rather than the MacUpdate page:
http://www.clamxav.com
There is another ClamXav site, ending in .org, that is fake. It's not related to the actual ClamXav. Don't go there. I'd love nothing better than to get that site taken down, but alas, that is not within my power.
I have mixed feelings about ClamXav. I like the guy who develops it, and I like the way it works... but it's not always on top of things with regard to malware definitions.
Regarding Avast, it is certainly not "the worst of the whole wretched lot" of anti-virus software. Neither is it something I would recommend highly. It has a tendency towards false positives, in my experience. Beyond that, I have not used it for a lengthy period of time, and cannot say more.
Go to my Mac Malware Guide and get the information you need to learn how to protect yourself, and then make your own educated decision about anti-virus software, based on your needs and behaviors. I have some recommendations there, and you can also take a look at the results of my testing of Mac anti-virus software. (Be sure to read the whole thing, and don't just skip straight to the results, as the results are meaningless without understanding what they mean and what they don't mean.)
With respect to your site and your basic research on the matter and limited time spent with these engines running, you have to see this from my side as well. I have over 20+ client networks that run nothing but the full licensed version of Avast with just the AV filters turned on (none of the Firewalling built into it of any kind). 2 of those clients are full Mac networks with 15+ Macs on them and they run the Mac version without issue. Their systems run at the same speed as they did without anything else on them. I also run the software myself daily an my system has no issues with slowness or anything. I have run Avast for the past 6+ years without problems with false positives or system corruptions of any kind, the same cannot be said for other platforms like McAfee and Norton who's bad signature updates have crippled entire networks. I have looked at numerous options from ESET to AVG Free and none of them have as small a footprint on the system as Avast in my professional opinion (one backed by over 15 years in the IT industry). While as of late I'll agree that the PC version of the software has had some additions to it that I don't agree with (like the newly added features of 8.0), the Mac version is still pretty basic in contrast. As such, even the PC side isn't bad, you just have to do a custom install and just exclude the additional options you don't want. Ultimately, they're adding it in there to try and protect idiot users more, but there's only so much you can do to keep people safe without piling on the security layers.
Anyway, as Thomas said... discussions about AV on Mac forums can go on for hours, but the fact remains that you run a risk with and without something on your system. Utimately it's your call to make, just be open minded and do your research instead of just taking the word of some home user of Macs with lot of points who've used these systems for over 10 years and are more proficient at protecting themselves than you are as a novice user. That is the best suggestion I can give you.

I have just purchased a used MacBook Pro. Should I use a virus protection program on this computer? I can get Norton for free through my cable provider. Thanks, funkro

I have just purchased a used MacBook Pro. Should I use a virus protection program on this computer? I can get Norton for free through my cable provider. Thanks, funkro

See my Mac Malware Guide.
This issue is more complex than some of the responses you have gotten are indicating. You definitely should avoid Norton, but there actually IS malware out there, and all anti-virus software is NOT "snake oil." Don't listen to anyone who tells you otherwise, as they don't know what they're talking about.
Although you should be able to do without anti-virus software just fine, there are some perfectly good reasons to install it and some good anti-virus apps to use if you decide to do so. Further, even if you do avoid anti-virus software, you need to understand what the threats are so you don't end up thinking you're totally safe and do something you shouldn't.

HT2311 Is there a virus protection for the apple iPad and iPad Air and iPhone 5 that we need to use for security?

Is there a virus protection for the apple iPads including the iPad Air and the iPhone 5, and if there is, how do we download it into our apple products? With everything that is going on it seems like I'm having more problems with freezing and crashing, getting kicked off my sites more often then ever! Is there a way to stop this?

There is no known malware capable of infecting an iOS device, unless it has been jailbroken. Due to the security that prevents malware, real anti-virus software on iOS is not possible, so none exists.
As to the problem, I'm unclear on exactly what you're seeing. What exactly does it mean to get "kicked off your sites?"

HT201413 I' new to iPads, does my iPad have it's own virus protection installed, or is it my pc's that is the protection?

I'm new to iPads and want to know if my iPad has it's own virus protection, or is it my pc protection that is used. We have been spammed and
I'm not sure what or how it happened? Any suggestions?

Prs1940 wrote:
I'm new to iPads and want to know if my iPad has it's own virus protection,
No, it does not. It does not need virus protection.
SPAMming has nothing to do with virii. It is email to an email account.
Your iPad simply looks at the email account on the server, same as your computer does.

Virus protection for MacBook Pro

Forum,
When I was using FCE there where many posts about using virus protection applications,such as Norton causing problems with video editing.
My MBC does not have a virus protection application but there seems to be an increasing threat to Apple computers as their market share becomes larger.
Will FCP suffer problems if a virus protection application is installed?
Thank you
Michael Craven.

Jim is correct, of course. But some computers have to live a double life. Under those circumstances, one can use Norton or other applications that are intended to detect malware, including viruses, but in a specific mode. These applications can be turned off for detection on the fly. The user can resort to manually initiated scans on a scheduled basis. Not the best of worlds but perhaps a stop gap measure if one is concerned. You could also consider using a router or access point between you and your computer. These devices are not assured protection, but make things a but harder for the malware to get to your system. Macs can be easily disconnected from any net work and reconnected after editing, of course.

MacBook Pro and Virus protection -Mac Newbe

I have just recently switched to Apple and purchased a MacBook Pro for home use. I am somewhat lost concerning what virus protection is "the best" to run. As with PC's there seems to be several offerings. I picked a "well known" version with my PC; however, a virus(worm,spyware...something) was still able to defeat the anti-virus and mess up my OS.

The last time I used a virus scanner on Mac OS was about 12 years ago. It only produced one false warning. The threat of viruses on OS X is much, much lower than in Windows, due to the fact that there's no real working virus for OS X yet, as far as I know. There are some concept 'viruses', but they all require user interaction to install, and with the new security features in Leopard it's very likely that you will notice when something fishy is going on (e.g. your Mac warns that you're opening a program when you have double-clicked something that was supposed to be an image).
I think that at the current time, it is more useful to maintain good security practices (enable your firewall, don't download and run any 'dubious' programs, check software update regularly and install security updates immediately,) than to install a virus scanner, which will only stress your system unnecessarily.
There are some situations where it's useful to install a virus scanner in OS X, though. First, if you use Boot Camp or Parallels (but then again, it may be more useful to install a PC virus scanner in your Windows partition). Second, to detect PC viruses, so you can tell if someone's PC is infected and prevent the virus from spreading to other PCs.

Macbook air virus protection

what is a good virus protection for the macbook air?

1. This comment applies to malicious software ("malware") that's installed unwittingly by the victim of a network attack. It does not apply to software, such as keystroke loggers, that may be installed deliberately by an intruder who has hands-on access to the victim's computer. That threat is in a different category, and there's no easy way to defend against it. If you have reason to suspect that you're the target of such an attack, you need expert help.
OS X now implements three layers of built-in protection specifically against malware, not counting runtime protections such as execute disable, sandboxing, system library randomization, and address space layout randomization that may also guard against other kinds of exploits.
2. All versions of OS X since 10.6.7 have been able to detect known Mac malware in downloaded files, and to block insecure web plugins. This feature is transparent to the user, but internally Apple calls it "XProtect." The malware recognition database is automatically checked for updates once a day; however, you shouldn't rely on it, because the attackers are always at least a day ahead of the defenders.
The following caveats apply to XProtect:
It can be bypassed by some third-party networking software, such as BitTorrent clients and Java applets.
It only applies to software downloaded from the network. Software installed from a CD or other media is not checked.
3. Starting with OS X 10.7.5, there has been a second layer of built-in malware protection, designated "Gatekeeper" by Apple. By default, applications and Installer packages downloaded from the network will only run if they're digitally signed by a developer with a certificate issued by Apple. Software certified in this way hasn't necessarily been tested by Apple, but you can be reasonably sure that it hasn't been modified by anyone other than the developer. His identity is known to Apple, so he could be held legally responsible if he distributed malware. That may not mean much if the developer lives in a country with a weak legal system (see below.)
Gatekeeper doesn't depend on a database of known malware. It has, however, the same limitations as XProtect, and in addition the following:
It can easily be disabled or overridden by the user.
A malware attacker could get control of a code-signing certificate under false pretenses, or could find some other way to bypass Apple's oversight, or the oversight could fail in a particular case due to human error.
For most purposes, applications recognized by Gatekeeper as signed, including App Store products, can be considered safe. Note, however, that at least one trojan for iOS (not for OS X) was briefly distributed by a developer in Russia through the iTunes App Store. That store is under the same oversight by Apple as the Mac App Store, so the protection shouldn't be considered absolute. App Store products may prompt for access to private data, such as your contacts. Think before granting that access. OS X security is based on user input. Never click anything reflexively.
4. Starting with OS X 10.8.3, a third layer of protection has been added: a "Malware Removal Tool" (MRT). MRT runs automatically in the background when you update the OS. It checks for, and removes, malware that may have evaded the other protections via a Java exploit (see below.) MRT also runs when you install or update the Apple-supplied Java runtime (but not the Oracle runtime.) Like XProtect, MRT is presumably effective against known attacks, but maybe not against unknown attacks. It notifies you if it finds malware, but otherwise there's no user interface to MRT.
5. Beyond XProtect, Gatekeeper, and MRT, there’s no evidence of any benefit from other automated protection against malware. The first and best line of defense is always your own intelligence. With the possible exception of Java exploits, all known malware circulating on the Internet that affects a fully-updated installation of OS X 10.6 or later takes the form of so-called "trojan horses," which can only have an effect if the victim is duped into running them. The threat therefore amounts to a battle of wits between you and the malware attacker. If you're smarter than he thinks you are, you'll win.
That means, in practice, that you never use software that comes from an untrustworthy source, or that does something inherently untrustworthy. How do you know what is trustworthy?
Any website that prompts you to install a “codec,” “plug-in,” "player," "extractor," or “certificate” that comes from that same site, or an unknown one, is untrustworthy.
A web operator who tells you that you have a “virus,” or that anything else is wrong with your computer, or that you have won a prize in a contest you never entered, is trying to commit a crime with you as the victim. (Some reputable websites did legitimately warn visitors who were infected with the "DNSChanger" malware. That exception to this rule no longer applies.)
Pirated copies or "cracks" of commercial software, no matter where they come from, are unsafe.
Software of any kind downloaded from a BitTorrent or from a Usenet binary newsgroup is unsafe.
Software that purports to help you do something that's illegal or that infringes copyright, such as saving streamed audio or video for reuse without permission, is unsafe. All YouTube "downloaders" are in this category, though not all are necessarily harmful.
Software with a corporate brand, such as Adobe Flash Player, must be downloaded directly from the developer’s website. If it comes from any other source, it's unsafe.
Even signed applications should not be trusted if they do something unexpected, such as asking for permission to access your contacts or your location for no apparent reason.
6. Java on the Web (not to be confused with JavaScript, to which it's not related, despite the similarity of the names) is a weak point in the security of any system. Java is, among other things, a platform for running complex applications in a web page, on the client. That was always a bad idea, and Java's developers have proven themselves incapable of implementing it without also creating a portal for malware to enter. Past Java exploits are the closest thing there has ever been to a Windows-style virus affecting OS X. Merely loading a page with malicious Java content could be harmful.
Fortunately, client-side Java on the Web is obsolete and mostly extinct. Only a few outmoded sites still use it. Try to hasten the process of extinction by avoiding those sites, if you have a choice. Forget about playing games or other non-essential uses of Java.
Java is not included in OS X 10.7 and later. Discrete Java installers are distributed by Apple and by Oracle (the developer of Java.) Don't use either one unless you need it. Most people don't. If Java is installed, disable it — not JavaScript — in your browsers.
Regardless of version, experience has shown that Java on the Web can't be trusted. If you must use a Java applet for a task on a specific site, enable Java only for that site in Safari. Never enable Java for a public website that carries third-party advertising. Use it only on well-known, login-protected, secure websites without ads. In Safari 6 or later, you'll see a lock icon in the address bar with the abbreviation "https" when visiting a secure site.
Follow the above guidelines, and you’ll be as safe from malware as you can practically be. The rest of this comment concerns what you should not do to protect yourself from malware.
7. Never install any commercial "anti-virus" or "Internet security" products for the Mac, as they all do more harm than good, if they do any good at all. If you need to be able to detect Windows malware in your files, use the free software ClamXav — nothing else.
Why shouldn't you use commercial "anti-virus" products?
Their design is predicated on the nonexistent threat that malware may be injected at any time, anywhere in the file system. Malware is downloaded from the network; it doesn't materialize from nowhere.
In order to meet that nonexistent threat, the software modifies or duplicates low-level functions of the operating system, which is a waste of resources and a common cause of instability, bugs, and poor performance.
By modifying the operating system, the software itself may create weaknesses that could be exploited by malware attackers.
8. ClamXav doesn't have these drawbacks. That doesn't mean it's entirely safe. It may report email messages that have "phishing" links in the body, or Windows malware in attachments, as infected files, and offer to delete or move them. Doing so will corrupt the Mail database. The messages should be deleted from within the Mail application.
ClamXav is not needed, and should not be relied upon, for protection against OS X malware. It's useful only for detecting Windows malware. Windows malware can't harm you directly (unless, of course, you use Windows.) Just don't pass it on to anyone else.
A Windows malware attachment in email is usually easy to recognize. The file name will often be targeted at people who aren't very bright; for example:
♥♥♥♥♥♥♥♥♥♥♥♥♥♥!!!!!!!H0TBABEZ4U!!!!!!!.AVI♥♥♥♥♥♥♥♥♥♥♥♥♥♥.exe
ClamXav may be able to tell you which particular virus or trojan it is, but do you care? In practice, there's seldom a reason to use ClamXav unless a network administrator requires you to run an anti-virus application.
9. The greatest harm done by security software, in my opinion, is in its effect on human behavior. It does little or nothing to protect people from emerging threats, but if they get a false sense of security from it, they may feel free to do things that expose them to higher risk. Nothing can lessen the need for safe computing practices.
10. It seems to be a common belief that the built-in Application Firewall acts as a barrier to infection, or prevents malware from functioning. It does neither. It blocks inbound connections to certain network services you're running, such as file sharing. It's disabled by default and you should leave it that way if you're behind a router on a private home or office network. Activate it only when you're on an untrusted network, for instance a public Wi-Fi hotspot, where you don't want to provide services. Disable any services you don't use in the Sharing preference pane. All are disabled by default.

Macbook Virus protection

I want to get a virus protection just to be safe and i wanted to know which virus protection is best
1.norton Antivirus
2.Intego VirusBarrier X5
Also i wanted to know which takes up less space?

Do You Need Anti-Virus Protection for Your Mac?
According to Rich Mogull's article, Should Mac Users Run Antivirus Software?,
"The reality is that today the Mac platform is relatively safe. There are hundreds of thousands of viruses and other malicious software programs floating around for Windows, but less than 200 are known to target the Mac, and many of those are aimed at versions of the Mac OS prior to Mac OS X (and thus have no effect on a modern Mac).
It's not that Mac OS X is inherently more secure against viruses than current versions of Windows (although it was clearly more secure than Windows prior to XP SP2); the numerous vulnerabilities reported and patched in recent years are just as exploitable as their Windows equivalents. But most security experts agree that malicious software these days is driven by financial incentives, and it's far more profitable to target the most dominant platform."
Mr. Mogull is a computer security expert. I recommend reading the entire article as it is quite informative.
For additional information on viruses, trojans, and spyware visit The XLab FAQs and read the FAQs on viruses and spyware.

Will I need any other virus protection such as McAfee for my computer if I'm using Firefox?

I'm purchasing a new home computer and would like to know if I will need any further virus protection, such as McAfee or Webroot? Is the protection from Firefox sufficient enough or should I get something else as well? Thank you.
Neil

Firefox is a browser, it is not a antivirus program, of course you must install a antivirus program of your choice.
An excellent add-on to support as a supplement your antivirus program which is provides extra protection to your Firefox is [https://addons.mozilla.org/en-us/firefox/addon/noscript/?src=hp-dl-mostpopular NoScript]. See it and your choice is yours.
thank you
Please mark "Solved" the answer that really solve the problem, to help others with a similar problem.

What modification is needed to AVG virus protection system after updating Firefox?

When I try to update Firefox on my computer I receive a message that the process will disable my AVG virus protection. I am currently using the latest version of AVG updated earlier this year.
I would appreciate further information on what modification is required to maintain my virus protection.

The extension has nothing to do with it. The "Search.avg.com" was already disabled and I did remove the AVG Toolbar, and any others mentioned Firefox not compatible with I disabled or deleted, I restarted Firefox and the same problem exists. No extension is connected to my antivirus program.

What is the best virus protection for a Mac?

What is the best virus protection for a Mac?

1. This comment applies to malicious software ("malware") that's installed unwittingly by the victim of a network attack. It does not apply to software, such as keystroke loggers, that may be installed deliberately by an intruder who has hands-on access to the victim's computer. That threat is in a different category, and there's no easy way to defend against it. If you have reason to suspect that you're the target of such an attack, you need expert help.
OS X now implements three layers of built-in protection specifically against malware, not counting runtime protections such as execute disable, sandboxing, system library randomization, and address space layout randomization that may also guard against other kinds of exploits.
2. All versions of OS X since 10.6.7 have been able to detect known Mac malware in downloaded files, and to block insecure web plugins. This feature is transparent to the user, but internally Apple calls it "XProtect." The malware recognition database is automatically checked for updates once a day; however, you shouldn't rely on it, because the attackers are always at least a day ahead of the defenders.
The following caveats apply to XProtect:
It can be bypassed by some third-party networking software, such as BitTorrent clients and Java applets.
It only applies to software downloaded from the network. Software installed from a CD or other media is not checked.
3. Starting with OS X 10.7.5, there has been a second layer of built-in malware protection, designated "Gatekeeper" by Apple. By default, applications and Installer packages downloaded from the network will only run if they're digitally signed by a developer with a certificate issued by Apple. Software certified in this way hasn't actually been tested by Apple (unless it comes from the Mac App Store), but you can be reasonably sure that it hasn't been modified by anyone other than the developer. His identity is known to Apple, so he could be held legally responsible if he distributed malware. For most practical purposes, applications recognized by Gatekeeper as signed can be considered safe.
Gatekeeper doesn't depend on a database of known malware. It has, however, the same limitations as XProtect, and in addition the following:
It can easily be disabled or overridden by the user.
A malware attacker could get control of a code-signing certificate under false pretenses, or could find some other way to evade Apple's controls.
4. Starting with OS X 10.8.3, a third layer of protection has been added: a "Malware Removal Tool" (MRT). MRT runs automatically in the background when you update the OS. It checks for, and removes, malware that may have evaded the other protections via a Java exploit (see below.) MRT also runs when you install or update the Apple-supplied Java runtime (but not the Oracle runtime.) Like XProtect, MRT is presumably effective against known attacks, but maybe not against unknown attacks. It notifies you if it finds malware, but otherwise there's no user interface to MRT.
5. Beyond XProtect, Gatekeeper, and MRT, there’s no evidence of any benefit from other automated protection against malware. The first and best line of defense is always your own intelligence. With the possible exception of Java exploits, all known malware circulating on the Internet that affects a fully-updated installation of OS X 10.6 or later takes the form of so-called "trojan horses," which can only have an effect if the victim is duped into running them. The threat therefore amounts to a battle of wits between you and the malware attacker. If you're smarter than he thinks you are, you'll win.
That means, in practice, that you never use software that comes from an untrustworthy source. How do you know whether a source is trustworthy?
Any website that prompts you to install a “codec,” “plug-in,” "player," "extractor," or “certificate” that comes from that same site, or an unknown one, is untrustworthy.
A web operator who tells you that you have a “virus,” or that anything else is wrong with your computer, or that you have won a prize in a contest you never entered, is trying to commit a crime with you as the victim. (Some reputable websites did legitimately warn visitors who were infected with the "DNSChanger" malware. That exception to this rule no longer applies.)
Pirated copies or "cracks" of commercial software, no matter where they come from, are unsafe.
Software of any kind downloaded from a BitTorrent or from a Usenet binary newsgroup is unsafe.
Software with a corporate brand, such as Adobe Flash Player, must be downloaded directly from the developer’s website. If it comes from any other source, it's unsafe.
6. Java on the Web (not to be confused with JavaScript, to which it's not related, despite the similarity of the names) is a weak point in the security of any system. Java is, among other things, a platform for running complex applications in a web page, on the client. That was always a bad idea, and Java's developers have proven themselves incapable of implementing it without also creating a portal for malware to enter. Past Java exploits are the closest thing there has ever been to a Windows-style "virus" affecting OS X. Merely loading a page with malicious Java content could be harmful. Fortunately, Java on the Web is mostly extinct. Only a few outmoded sites still use it. Try to hasten the process of extinction by avoiding those sites, if you have a choice. Forget about playing games or other non-essential uses of Java.
Java is not included in OS X 10.7 and later. Discrete Java installers are distributed by Apple and by Oracle (the developer of Java.) Don't use either one unless you need it. Most people don't. If Java is installed, disable it — not JavaScript — in your browsers. In Safari, this is done by unchecking the box marked Enable Java in the Security tab of the preferences dialog.
Regardless of version, experience has shown that Java on the Web can't be trusted. If you must use a Java applet for a specific task, enable Java only when needed for the task and disable it immediately when done. Close all other browser windows and tabs, and don't visit any other sites while Java is active. Never enable Java on a public web page that carries third-party advertising. Use it, when necessary, only on well-known, login-protected, secure websites without ads. In Safari 6 or later, you'll see a lock icon in the address bar with the abbreviation "https" when visiting a secure site.
Follow the above guidelines, and you’ll be as safe from malware as you can practically be. The rest of this comment concerns what you should not do to protect yourself from malware.
7. Never install any commercial "anti-virus" or "Internet security" products for the Mac, as they all do more harm than good, if they do any good at all. If you need to be able to detect Windows malware in your files, use the free software ClamXav — nothing else.
Why shouldn't you use commercial "anti-virus" products?
Their design is predicated on the nonexistent threat that malware may be injected at any time, anywhere in the file system. Malware is downloaded from the network; it doesn't materialize from nowhere.
In order to meet that nonexistent threat, the software modifies or duplicates low-level functions of the operating system, which is a waste of resources and a common cause of instability, bugs, and poor performance.
By modifying the operating system, the software itself may create weaknesses that could be exploited by malware attackers.
8. ClamXav doesn't have these drawbacks. That doesn't mean it's entirely safe. It may report email messages that have "phishing" links in the body, or Windows malware in attachments, as infected files, and offer to delete or move them. Doing so will corrupt the Mail database. The messages should be deleted from within the Mail application.
ClamXav is not needed, and should not be relied upon, for protection against OS X malware. It's useful only for detecting Windows malware. Windows malware can't harm you directly (unless, of course, you use Windows.) Just don't pass it on to anyone else.
A Windows malware attachment in email is usually easy to recognize. The file name will often be targeted at people who aren't very bright; for example:
♥♥♥♥♥♥♥♥♥♥♥♥♥♥!!!!!!!H0TBABEZ4U!!!!!!!.AVI♥♥♥♥♥♥♥♥♥♥♥♥♥♥.exe
ClamXav may be able to tell you which particular virus or trojan it is, but do you care? In practice, there's seldom a reason to use ClamXav unless a network administrator requires you to run an anti-virus application.
9. The greatest harm done by security software, in my opinion, is in its effect on human behavior. It does little or nothing to protect people from emerging threats, but they get a false sense of security from it, and then they may behave in ways that expose them to higher risk. Nothing can lessen the need for safe computing practices.
10. It seems to be a common belief that the built-in Application Firewall acts as a barrier to infection, or prevents malware from functioning. It does neither. It blocks inbound connections to certain network services you're running, such as file sharing. It's disabled by default and you should leave it that way if you're behind a router on a private home or office network. Activate it only when you're on an untrusted network, for instance a public Wi-Fi hotspot, where you don't want to provide services. Disable any services you don't use in the Sharing preference pane. All are disabled by default.

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