New Apple Mac Trojan Called OSX/Crisis Discovered

Malware-AlertThis threat may run on Leopard 10.5, but it has a usually crashes. It does not run on Mac OS X 10.8 (Mountain Lion).
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Intego has discovered a new Trojan called OSX/Crisis. This threat is a dropper which creates a backdoor when it’s run. It installs silently, without requiring a password, and works only in OSX versions 10.6 and 10.7 – Snow Leopard and Lion.

The Trojan preserves itself against reboots, so it will continue to run until it’s removed. Depending on whether or not the dropper runs on a user account with Admin permissions, it will install different components. We have not yet seen if or how this threat is installed on a user’s system; it may be that an installer component will try to establish Admin permissions.

If the dropper runs on a system with Admin permissions, it will drop a rootkit to hide itself. In either case, it creates a number of files and folders to complete its tasks. It creates 17 files when it’s run with Admin permissions, 14 files when it’s run without. Many of these are randomly named, but there are some that are consistent.

With or without Admin permissions, this folder is created in the infected user’s home directory:

  • ~/Library/ScriptingAdditions/appleHID/

Only with Admin permissions, this folder is created:

  • /System/Library/Frameworks/Foundation.framework/XPCServices/

The backdoor component calls home to the IP address 176.58.100.37 every 5 minutes, awaiting instructions. The file is created in a way that is intended to make reverse engineering tools more difficult to use when analyzing the file. This sort of anti-analysis technique is common in Windows malware, but is relatively uncommon for OS X malware.

Via : Intego

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Posted in Macintosh

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