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Backdoor:OSX/Olyx.B

Classification

Category: Malware

Type: Backdoor

Aliases: Backdoor:OSX/Olyx.B, Mac.OSX.Trojan.Lamadai.A

Summary


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

Removal


Manual Removal Instructions
  • 1. Open Activity Monitor, select AudioServer, and click Quit Process.
  • 2. Open Terminal, then execute the followings:
    • rm /Library/Audio/Plug-Ins/AudioServer
    • rm ~/Library/LaunchAgents/com.apple.DockActions.plist
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Technical Details


Arrival

Olyx.B is dropped into the system by malicious Java applets that exploit vulnerabilities identified by CVE-2011-3544 and CVE-2012-0507.

Installation

The malware drops the following copy of itself:

  • /Library/Audio/Plug-Ins/AudioServer

It creates the following launchpoint for the file above:

  • ~/Library/LaunchAgents/com.apple.DockActions.plist
Payload

The malware connects to a remote server to obtain additional commands. The server varies between samples. As of this writing, there are two known servers:

  • dns[...].assyra.com[...]
  • avira[...].suroot.com[...]

The backdoor is capable of performing the following actions:

  • Downloading and uploading files
  • Executing shell commands
Other variants