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