viruses over wifi?

Discussion in 'MacBook Pro' started by kingdummkopf, Oct 14, 2012.

  1. kingdummkopf macrumors member

    Jun 8, 2012
    i was wondering if this is possible?

    say for example i have my imac, macbook and ipad each downloading different things at the same time, whilst i am on a windows computer that suddenly becomes infected with a virus... could that virus spread to the other 'i devices' if they were all connected to the same wifi?

    or is that impossible?

    my windows computer was infected with a virus, and i don't want anything being spread to my mac computers and ipad you see.

    ... or would the ipad and imac, and macbook be uninfected?
  2. simsaladimbamba

    Nov 28, 2010
    Since those Windows viruses do NOT run on Mac OS X and iOS, your Macs and iOS devices are safe from Windows viruses.

  3. mrsir2009 macrumors 604


    Sep 17, 2009
    Melbourne, Australia
    Macs and iDevices cannot get Windows viruses, so no. There is no chance :)
  4. GGJstudios macrumors Westmere


    May 16, 2008
    Macs are not immune to malware, but no true viruses exist in the wild that can run on Mac OS X, and there never have been any since it was released over 10 years ago. The only malware in the wild that can affect Mac OS X is a handful of trojans, which can be easily avoided by practicing safe computing (see below). Also, Mac OS X 10.6 and later versions have anti-malware protection built in, further reducing the need for 3rd party antivirus apps.
    1. Make sure your built-in Mac firewall is enabled in System Preferences > Security > Firewall

    2. Uncheck "Open "safe" files after downloading" in Safari > Preferences > General

    3. Disable Java in your browser (Safari, Chrome, Firefox). This will protect you from malware that exploits Java in your browser, including the recent Flashback trojan. Leave Java disabled until you visit a trusted site that requires it, then re-enable only for the duration of your visit to that site. (This is not to be confused with JavaScript, which you should leave enabled.)

    4. Change your DNS servers to OpenDNS servers by reading this.

    5. Be careful to only install software from trusted, reputable sites. Never install pirated software. If you're not sure about an app, ask in this forum before installing.

    6. Never let someone else have access to install anything on your Mac.

    7. Don't open files that you receive from unknown or untrusted sources.

    8. For added security, make sure all network, email, financial and other important passwords are long and complex, including upper and lower case letters, numbers and special characters.

    9. Always keep your Mac and application software updated. Use Software Update for your Mac software. For other software, it's safer to get updates from the developer's site or from the menu item "Check for updates", rather than installing from any notification window that pops up while you're surfing the web.
    That's all you need to do to keep your Mac completely free of any Mac OS X malware that has ever been released into the wild. While you may elect to use it, 3rd party antivirus software is not required to keep your Mac malware-free.
  5. kingdummkopf thread starter macrumors member

    Jun 8, 2012
    ok thanks. so that's what i thought. however, can viruses be spread through windows computers on the same wifi connectrion.... over the wifi, if each laptop is downloading something - or is that impossible?
  6. Mrbobb macrumors 601

    Aug 27, 2012
    No. WIFI is not the problem, u could spread the infection even if both of you are on wired ethernet.

    Infection doesn't happen "in the air" so to speak, it usually happens when you get infected, THEN the virus start searching for other computers in your Local Area Network, so regardless of WIFI, ethernet of whatever interconnection you got in there.

    OPEN WIFI (i.e.: Starbucks) however poses a danger, because everything you send or receive are in clear text, meaning another computer configure to listen to all traffic going through the WIFI router can potentially SEE what you are doing. Now if you are SURE your confidential stuff are done through HTTPS then you should be OK, but I personally never do online banking for example on an open public WIFI connection.
  7. kingdummkopf thread starter macrumors member

    Jun 8, 2012
    i was on the wifI at home which is a secure connection, passworded etc. my imac, Macbook, ipad, and windows computer were each downloading something when my other windows computer downloaded a virus. could that virus have then transferred to any other device that was downloading via that same wifi connection? im unsure what you mean.
  8. Queen6 macrumors 604


    Dec 11, 2008
    Land of the Unexpected
    Same questions, same rhetoric;

    There are several reasons to run antivirus/malware on OS X especially if you are dealing with a mixed environment passing on malicious code even inadvertently does you no favours in the profesional world, let alone family and friends. What does not hurt your Mac & OS X may bring a PC to it`s knees.

    You do need to be careful on the choice of application; ClamXav is extremely light and only looks in realtime at what you specify and it`s free. The sentry is presently utilising 0.2% of CPU consuming just over an hours worth of CPU time over several weeks and this is on a machine over four years old. Does anyone seriously still believe that running ClamXav on todays modern hardware impacts performance! The paid for packages I agree are a waste of $ offering little more than a placebo with a heavyweight user interface. ClamAV the parent of ClamXav protects numerous servers globally, which is a pretty good tip...

    ClamXav will have no impact on a modern Intel based Mac. To have a free, low headroom, accurate scanner that offers a lot of flexibility and not utilize it seems somewhat stubborn at best. The retorts of AV being a resource hog, boils down to one thing, research; ClamXav will not bog your system down, if it does you have some other inconsistencies that need addressing, or your hardware is so old it`s well and truly time to upgrade, on my Early 2008 MBP ClamXav is simply invisible, there is absolutely no degradation of performance, as for the i7 2.4 MBP & now the Retina MBP it`s completely transparant.

    I have literally decades of work on my systems, I have no intention of losing any data, ClamXav is but one tool in a multilayered safety net. Lets face it, if and when OS X is compromised it will spread like wildfire as many fundamentally believe that OS X is invulnerable. I am not entirely sure posts that overly renforce this false sense of security are helpful to the average user, even Apple recognise threats to the operating system and sub components, however the updates are too slow to be considered a preventative measure...

    I have never had a positive hit in all the years I have run ClamXav equally OS X is gaining traction and it`s simply a matter of time before someone figures it out, thinking otherwise is simply naive at best. ClamXav cost me nothing monetarily nor time in productivity, this is a safety net that costs little more than five minutes of your time, one of life's better investments.

    Virus/malware gains traction by exploiting vulnerabilities on unprotected systems. I don't believe for one second that CalmXav is the single security solution for OS X, it is however the de-facto standard for many mail servers globally (ClamAV), and the app is rapidly updated.

    Apple has included ClamAV with OS X server since 10.4 and continues to do so today ( with OS X 10.7.3 Lion Server. ClamXav is transparent on an Intel based Mac, adds another level of protection at zero cost.

    Apple also clearly list Calmav-137-1 on their 10.7.3 Open Source page ( admittedly it is not implemented in the Lion client release, equally I would not be surprised if it was quietly implemented in a forthcoming release of OS X as was XProtect implemented in Snow Leopard. Apple may simply choose to integrate ClamAV into Xprotect and the vast majority will never know the difference. As of OS X 10.6 your Mac is running anti malware like it or not ;)

    There are many compelling reasons to run ClamXav and few if any not too, personal choices aside I fundamentally believe that suggesting that OS X is safe to all and does not need such tools is very much a step in the wrong direction; not all are technically minded, neither do all users who may have access to machines follow the rules and guidelines of safe computing. The vast majority simply point and click to get to where or what they want ClamXav simply serves as a barrier to protect those that are unaware and some cases unconcerned, ultimately such safeguards protect the community as a whole.

    Be mindful that some of those advising that there is no need for Mac`s to run any form of AV, have already have a high level of computing proficiency and a deep understanding of the system, your kid`s, your grandparent`s, the guy from next door etc likely wont have this acquired knowledge. The premis is to keep the the community as a whole safe, or of course we can all simply ignore the threat and hope that by doing little to nothing, and disabling functionality will do the trick.

    n.b. Those that want to run the ClamXav sentry need to download directly from the ClamXav site, as the apps store version does not have this functionality.

    Install, dont install it`s down to you now...............
  9. snaky69, Oct 15, 2012
    Last edited: Oct 15, 2012

    snaky69 macrumors 603

    Mar 14, 2008
    Short answer is no, your Apple devices were not exposed to anything.

    WiFi doesn't matter, the fact that everyone was downloading anything doesn't matter either. Windows virus cannot infect Apple devices, period. It's just as simple as that.

    You can't run a windows-only game on a Mac, or on an iPod touch, same goes for viruses.
  10. Mrbobb macrumors 601

    Aug 27, 2012
    We already gave you answer NO.

    But u keep asking so we give you more technical details, but u don't understand what we are saying, so I think we're done.
  11. darkprints macrumors newbie

    Jun 26, 2012
  12. JPNFRK7 macrumors 6502a


    Sep 27, 2012
    Very good read, Thank you! Can you please put a link up to the ClamXav site?
  13. GGJstudios macrumors Westmere


    May 16, 2008
  14. VTMac macrumors 6502

    Jun 9, 2008
    Clam will do nothing for you when the first osx virus hits. It relies in definition files that won't have that virus because it never existed. Until there are enough viruses and enough uses running av to get hit with viruses early enough to generate definitions it will have no protective effect for your Mac. Your other points remain.

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