Cleaning OS of malware

Discussion in 'Mac Basics and Help' started by diegobgr, Nov 24, 2011.

  1. diegobgr macrumors 6502

    Joined:
    Nov 22, 2009
    #1
    Hi!

    A friend of mine has been using my iMac for some days.

    I think that he could have infected the system with some trojan or virus. I know that he had downloaded Adobe Flash from a suspicius site.

    I also had and external hard disk connected to it so it could have been affected to. if hard disk is infected and I format the iMac and then connect the hard disk to the iMac, can be the iMac affected again?

    What can I do to be 100% sure that it is clean?

    Clamxav show it's OK, but I want to be sure.

    And finally, any advices about security in Mac OS, specially about user accounts?
     
  2. simsaladimbamba

    Joined:
    Nov 28, 2010
    Location:
    located
    #2
    Does your friend have your account's password?
    If not, s/he can't install anything malicious.
    There are currently no viruses for Mac OS X in public circulation, only a handful of trojans and other malware, which have to be installed manually via entering the administrator password.
    The only anti-virus you need to protect your Mac is education and common sense.
    Also know, that the term "virus" is often used to refer to other kinds of malware, but there are differences, which you can find out by reading the following:

    Mac Virus/Malware Info by GGJstudios
     
  3. diegobgr thread starter macrumors 6502

    Joined:
    Nov 22, 2009
    #3
    The fact is I gave it him to I install some apps. I regret now, but now I want to fix it.

    That article looks really great, thanks!
     
  4. diegobgr thread starter macrumors 6502

    Joined:
    Nov 22, 2009
    #5
    I think MacDefender and the fake Adobe Flash.

    Could it had infected the external hard disk?
     
  5. ezramoore macrumors 6502a

    Joined:
    Mar 20, 2006
    Location:
    Washington State
    #6
    You gave it to them so that they would install MacDefender and a fake Flash app?

    What apps did you want them to install when you have it to them?
     
  6. diegobgr thread starter macrumors 6502

    Joined:
    Nov 22, 2009
    #7
    Anyway, I have just formatted both external and internal disks.

    Clamxav show it's clean, so no reason to be worry, right?
     
  7. GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #8
    Right. In the future, I recommend you don't give your Mac to others or let them install software, and certainly don't give out your admin password. I also encourage you to read the Mac Virus/Malware Info link that simsaladimbamba posted. The best defense against Mac malware is an informed and careful user.
     
  8. diegobgr thread starter macrumors 6502

    Joined:
    Nov 22, 2009
    #9
    I have read the link carefully and it won't happen again.

    I use the Lion thumb drive to boot from there and format first the the internal disk and then the external.

    It's right?

    Can trojans sprend themselves to external disks or pendrives, if the OS is infected?

    Thanks!
     
  9. GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #10
    If you booted from your Lion thumb drive to reformat the drives, it cannot be infected. You're fine.
     
  10. diegobgr thread starter macrumors 6502

    Joined:
    Nov 22, 2009
    #11
    Ok, nice.

    Anyway, the new installation of the OS shows it's clean.

    If for any reason, I still have some trojan, I can't inffect the OS again without the admin password, right?

    Thanks a lot for your help
     
  11. GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #12
    You don't.
     
  12. diegobgr thread starter macrumors 6502

    Joined:
    Nov 22, 2009
    #13
    ;)

    Thanks, I should not worry
     

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