MAC.OSX.Trojan.Lamadai.B, Backdoor:OSX/Olyx.C


Backdoor:OSX/Olyx.C connects to a remote server to receive further instructions, without the knowledge or permission from the user.


Manual removal

  1. 1. Open Activity Monitor, select DockLight, and click Quit Process.
  2. 2. Open Terminal, then execute the following:
    • sudo rm /Applications/
    • rm ~/Library/LaunchAgents/

Suspect a file is incorrectly detected (a False Positive)?

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

  • Check for the latest database updates

    First check if your F-Secure security program is using the latest detection database updates, then try scanning the file again.

  • Submit a sample

    After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.

    NOTE If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.

  • Exclude a file from further scanning

    If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.

    Note You need administrative rights to change the settings.

Find out more

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Submit a sample

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Technical Details


Olyx.C is dropped into the system by malicious Word documents that exploit the vulnerability identified by CVE-2009-0563.


The malware drops the following copy of itself:

  • /Applications/

It creates the following launchpoint for the file above:

  • ~/Library/LaunchAgents/


The malware connects to a2012[...][...] to obtain additional commands.

The backdoor is capable of performing the following actions:

  • Downloading and uploading files
  • Executing shell commands

Other variants