I Opened A Strange Attachment, Do I need To Install Anti Virus Software?

I have Yahoo Mail and recently received some emails from myself with strange attachments. Similar emails were sent to random contacts in my Yahoo contact list. I did not send these emails. When I changed my email password, these emails stopped. However, I'm worried my iMac G5 (OS 10.6.4) has a virus because I opened one of the attachments. Also, could a worm virus on my IMac have caused these emails? Yahoo advised me to run anti-virus software. Do I need to run anti-virus software and if so, which one? I've been reading online that anti virus software can cause more harm than good and make your mac "buggy," whatever that means.

P NewYork wrote:
I've been reading online that anti virus software can cause more harm than good and make your mac "buggy," whatever that means.
Yes, you read right! There are no known viruses that attack OS X and other exploits are very rare.
It sounds like your email address is being spoofed.
http://en.wikipedia.org/wiki/Spoofing_attack
This means that infected PC is going through its contact list and sending spoofed as that address.
There's nothing you can do but alert your PC friends.
EDIT: Are these emails actually being sent by your Mac? Check in Sent mail folder?
If you feel you MUST run AV software to prove you have nothing , do a scan with ClamXav a mac friendly freeware app.
-mj
Message was edited by: macjack

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A user in another forum asked me this question. I realize this is hardly a new topic, but below was my answer. I figured I would post it here and get your thoughts as well. Perhaps this and your comments will be helpful for others with the same question.
One question; I do not have an antivirus installed. Does a Mac need an antivirus installed? if yes, what would you recommend?
Does a Mac "need" antivirus software? Though this can be a controversial topic with some, my simple answer is "No". Personally, in the some 20 years I have been using Macs I have never installed an antivirus program. During that same time I have never been infected by a Mac-targeted virus/trojan/worm etc.
That is not to say that trojans and vulnerabilities have not existed. But the truth is, unlike PCs, Macs simply do not make good targets for these kinds of attacks. For the most part, for a Mac to become compromised a user has to permit it by lowering their defenses or manually installing some infected software package. On the other hand many PCs can become infected without any effort on the users part. Thus the need for every PC to be running antivirus software. After everything has been said and done, the truth is attacks on the Mac have simply not been very effective. Whereas, a PC virus can be spread worldwide within hours and days.
Macs also enjoy the benefit of being a less attractive target for hackers. If you are a virus designer, you want your product to have the most impact, and make headlines. As a result you are going to target the largest sector of the computing population - PCs. Additionally, most of the more recent attacks by hackers have been to establish what are called 'botnets'. These are large numbers of compromised PCs connected together via the internet, all controlled by one or more criminal entities. Most of these PC owners are unaware that their computers has been silently taken over to be used for gleaning information for identity theft or to distribute spam email worldwide. Since Macs are a completely different platform, and their numbers significantly fewer than PCs, it's simply not worth the effort to design software to include Macs in these botnets.
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Avoid advertising your primary email address to the world. That is, resist using your email address to fill-out contest forms or signing up for websites or various offers that are simply attempts at gleaning personal information. Guard your email address like you would any other personal information. If you must submit an email address to an unknown entity, use a special email address (or alias) set up just for these instances. Then when that email account becomes clogged with spam, close it and setup another one. But reserve your primary email address just for family, friends, & business use.
Finally, antivirus software for the Mac is notoriously problematic. At best, it simply slows your system down. At worst, it introduces points of failure and crashes that are simply not necessary. And such software often interferes with normal processes such as Time Machine backups, MobileMe syncing, and file transfers. Also, antivirus software can only protect you from 'known' threats. If there are no legitimate 'known' threats to the Mac right now, what are you protecting yourself against? If a genuinely virulent new virus/trojan suddenly appears among the Mac community, then you will either, buy antivirus software at that point, or already be infected, at which point you will buy antivirus software at that point. But running antivirus software now will not protect you against an unknown threat
Some will argue that, while the Mac itself is less likely to become infected, you should still run antivirus software as it is designed to catch PC viruses that you might pass on to PC users. That is a personal decision. However, my position is this, if I'm going to observe save computing practices, then I am unlikely to pass on any PC viruses to begin with. Why slow down my own system for the benefit of others if I'm unlikely to behave in a way that will compromise their computers?
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Hi Glenn. I just wanted to let you know that your post in the subject line above helped me save the life of my wife's MacBook Pro (early 2008 15" Intel Core 2 Duo/Snow Leopard 10.6.2). The OS was messed up beyond repair - I believe it's due to the fact that her iPhoto library is on an external HD combined with her using iPhoto as her screen saver, which caused some sort of permissions anomaly that over time became irreparable. Not sure though, but the thing was practically unusable. In any case, thank you thank you thank you for how precise your explanation was - I followed it to the letter and lo and behold was able to wipe the drive, re-install Snow Leopard, and restore it from the Time Machine backup. So you should know that although you were writing at the time about Leopard, the exact same process worked perfectly for Snow Leopard as well. Thank you again!

Anti Virus Software - Do I need?

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THX

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The right way/order is to update the OP, then reinstall the applications.
For the Java SE,
http://support.apple.com/kb/DL1572
Some have found that the page may turn up blank to start with, so it may be necessary to reload the page.
Others have found that it may depend on browser. Specifically, a switch from Safari has solved it in one case.

I have a mac book pro osx 10.7.5. Do I need to get anti-virus security software

I have a mac book pro osx 10.7.5. i do not have a virus checker. Do I need to get anti-virus security software that will protect against the new virus? And what would you recommend.
Thanks

There will always be a "new virus". Is this the recent threat you are concerned about?
http://www.bbc.com/news/technology-27681236
It only affects Windows PCs, which is usually the case.
have a mac book pro osx 10.7.5. i do not have a virus checker.
Those two statements contradict each other. OS X 10.7.5 already includes everything it needs to protect itself from viruses and malware. Keep it that way with software updates from Apple. Installing third party "anti-virus" software cannot possibly protect you from all threats, whether they exist today, or may occur at any time in the future. Such products are far more likely to cause random instability, crashes, loss of data, time, money, or all the above, while providing nothing other than a misplaced sense of complacency - a threat all to itself.
The sky is perpetually falling for so-called "news" outlets. It has been so for many people since the beginning of time, and it will remain so for all eternity. Don't confuse fearmongering with becoming informed.
A much better question is "how should I protect my Mac":
Never install any product that claims to "speed up", "clean up", "optimize", or "accelerate" your Mac. Without exception, they will do the opposite.
Never install pirated or "cracked" software, software obtained from dubious websites, or other questionable sources. Illegally obtained software is almost certain to contain malware.
Don’t supply your password in response to a popup window requesting it, unless you know what it is and the reason your credentials are required.
Don’t open email attachments from email addresses that you do not recognize, or click links contained in an email:
Most of these are scams that direct you to fraudulent sites that attempt to convince you to disclose personal information.
Such "phishing" attempts are the 21st century equivalent of a social exploit that has existed since the dawn of civilization. Don’t fall for it.
Apple will never ask you to reveal personal information in an email. If you receive an unexpected email from Apple saying your account will be closed unless you take immediate action, just ignore it. If your iTunes or App Store account becomes disabled for valid reasons, you will know when you try to buy something or log in to this support site, and are unable to.
Don’t install browser extensions unless you understand their purpose. Go to the Safari menu > Preferences > Extensions. If you see any extensions that you do not recognize or understand, simply click the Uninstall button and they will be gone.
Don’t install Java unless you are certain that you need it:
Java, a non-Apple product, is a potential vector for malware. If you are required to use Java, be mindful of that possibility.
Java can be disabled in System Preferences.
Despite its name JavaScript is unrelated to Java. No malware can infect your Mac through JavaScript. It’s OK to leave it enabled.
Block browser popups: Safari menu > Preferences > Security > and check "Block popup windows":
Popup windows are useful and required for some websites, but popups have devolved to become a common means to deliver targeted advertising that you probably do not want.
Popups themselves cannot infect your Mac, but many contain resource-hungry code that will slow down Internet browsing.
If you ever see a popup indicating it detected registry errors, that your Mac is infected with some ick, or that you won some prize, it is 100% fraudulent. Ignore it.
Ignore hyperventilating popular media outlets that thrive by promoting fear and discord with entertainment products arrogantly presented as "news". Learn what real threats actually exist and how to arm yourself against them:
The most serious threat to your data security is phishing. To date, most of these attempts have been pathetic and are easily recognized, but that is likely to change in the future as criminals become more clever.
OS X viruses do not exist, but intentionally malicious or poorly written code, created by either nefarious or inept individuals, is nothing new.
Never install something without first knowing what it is, what it does, how it works, and how to get rid of it when you don’t want it any more.
If you elect to use "anti-virus" software, familiarize yourself with its limitations and potential to cause adverse effects, and apply the principle immediately preceding this one.
Most such utilities will only slow down and destabilize your Mac while they look for viruses that do not exist, conveying no benefit whatsoever - other than to make you "feel good" about security, when you should actually be exercising sound judgment, derived from accurate knowledge, based on verifiable facts.
Do install updates from Apple as they become available. No one knows more about Macs and how to protect them than the company that builds them.
Summary: Use common sense and caution when you use your Mac, just like you would in any social context. There is no product, utility, or magic talisman that can protect you from all the evils of mankind.

Anti virus software - do i need it for my mac?

Hi - with all the publicity in the news about the hacking of PC's and we only have 2 weeks to protect our computers from hackers - would you recommend that we purchase particular software for our iMac's to combat this forthcoming attack? Any information gratefully received. x

with all the publicity in the news about the hacking of PC's and we only have 2 weeks to protect our computers from hackers
You have to protect your computers from hackers all the time. The point is that you have to do that, and delegating that responsibility to some magical product that claims the ability to do it for you is an ineffective defense.
There is no two week countdown to anything; there never has been.
- would you recommend that we purchase particular software for our iMac's to combat this forthcoming attack?
Absolutely not. OS X already includes everything it needs to protect itself from viruses and malware. Keep it that way with software updates from Apple.
A much better question is "how should I protect my Mac":
Never install any product that claims to "speed up", "clean up", "optimize", or "accelerate" your Mac. Without exception, they will do the opposite.
Never install pirated or "cracked" software, software obtained from dubious websites, or other questionable sources. Illegally obtained software is almost certain to contain malware.
Don’t supply your password in response to a popup window requesting it, unless you know what it is and the reason your credentials are required.
Don’t open email attachments from email addresses that you do not recognize, or click links contained in an email:
Most of these are scams that direct you to fraudulent sites that attempt to convince you to disclose personal information.
Such "phishing" attempts are the 21st century equivalent of a social exploit that has existed since the dawn of civilization. Don’t fall for it.
Apple will never ask you to reveal personal information in an email. If you receive an unexpected email from Apple saying your account will be closed unless you take immediate action, just ignore it. If your iTunes or App Store account becomes disabled for valid reasons, you will know when you try to buy something or log in to this support site, and are unable to.
Don’t install browser extensions unless you understand their purpose. Go to the Safari menu > Preferences > Extensions. If you see any extensions that you do not recognize or understand, simply click the Uninstall button and they will be gone.
Don’t install Java unless you are certain that you need it:
Java, a non-Apple product, is a potential vector for malware. If you are required to use Java, be mindful of that possibility.
Java can be disabled in System Preferences.
Despite its name JavaScript is unrelated to Java. No malware can infect your Mac through JavaScript. It’s OK to leave it enabled.
Block browser popups: Safari menu > Preferences > Security > and check "Block popup windows":
Popup windows are useful and required for some websites, but popups have devolved to become a common means to deliver targeted advertising that you probably do not want.
Popups themselves cannot infect your Mac, but many contain resource-hungry code that will slow down Internet browsing.
If you ever see a popup indicating it detected registry errors, that your Mac is infected with some ick, or that you won some prize, it is 100% fraudulent. Ignore it.
Ignore hyperventilating popular media outlets that thrive by promoting fear and discord with entertainment products arrogantly presented as "news". Learn what real threats actually exist and how to arm yourself against them:
The most serious threat to your data security is phishing. To date, most of these attempts have been pathetic and are easily recognized, but that is likely to change in the future as criminals become more clever.
OS X viruses do not exist, but intentionally malicious or poorly written code, created by either nefarious or inept individuals, is nothing new.
Never install something without first knowing what it is, what it does, how it works, and how to get rid of it when you don’t want it any more.
If you elect to use "anti-virus" software, familiarize yourself with its limitations and potential to cause adverse effects, and apply the principle immediately preceding this one.
Most such utilities will only slow down and destabilize your Mac while they look for viruses that do not exist, conveying no benefit whatsoever - other than to make you "feel good" about security, when you should actually be exercising sound judgment, derived from accurate knowledge, based on verifiable facts.
Do install updates from Apple as they become available. No one knows more about Macs and how to protect them than the company that builds them.
Summary: Use common sense and caution when you use your Mac, just like you would in any social context. There is no product, utility, or magic talisman that can protect you from all the evils of mankind.

Will I need anti virus software for boot camp?

Hi everyone,
i'm looking at installing leopard and xp onto an external portable hard disk. Will i need to install all the rubbish windows xp anti virus software if i'm not going to run / connect to the internet while using xp? My main use for xp is for some unavailable software and pc games.
And if i don't install the anti virus software would potential viruses affect only my external hard drive with the xp partition or both my internal drive and external drive?
thanks guys

"...i'm looking at installing leopard and xp onto an external portable hard disk...."
Why both? For instance, I have XP on my MacBook and I also have an old hard drive with XP (from another computer) in a portable case with USB. I can plug that thing into my MacBook and it is merely seen as an external storage drive. (I've never tried to boot from it though...)
"...Will i need to install all the rubbish windows xp anti virus software if i'm not going to run / connect to the internet while using xp?..."
Obviously viruses etc come from outside places, so either they come from the 'net or else from email or disks or storage sticks. If someone knowingly or unknowingly planted malware on them then your not safe. Macs are immune (99.9%) and of course Windows is wide open for trouble. If you stay off the 'net that is 90% of the battle. The rest is whether or not YOU place on your system a file or disk or jump drive which has "been places".
"...And if i don't install the anti virus software would potential viruses affect only my external hard drive with the xp partition or both my internal drive and external drive?..."
With BootCamp you only need a hard firewall (a router, wireless or wire) and free AVG antivirus to protect your Windows side. (Unless you are doing serious file swapping and surfing scary websites - then you need to purchase top notch AV like Symantec) but that is only a problem for your Windows installation.
Your Mac side will always (99.9%) be safe from your Windows problems.
That is the great thing about BootCamp. Your Windows side could be totally infected and destroyed and you can still boot to OS X no problem and perform a fresh install of Windows. Windows needs protection - OS X just doesn't (unless the FBI, Interpol, and MI5 are after you - if someone WANTS to trash OS X they can. It appears no one ever wants to though...)
I'm saying that if you intend to have external BootCamp SIMPLY to be safe (instead of just right on your Mac's internal hard drive) from viruses, it is not necessary. If you have Windows on your internal drive and only boot to it while offline it is the same safety level - totally safe. If you have the hard firewall and free AVG you are seriously safe as it is. And your Apple side is always safe no matter what.
Just my opinion / experience. Others can chime in with their views / experiences - I'd like to hear them...
Cheers

I Opened A Strange Attachment, Do I need To Install Anti Virus Software?

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