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OSX_FLASHBCK.AB

April 05, 2012
 Analysis by: Sabrina Lei Sioting
 PLATFORM:

Mac OS X

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware


Trend Micro has received multiple samples of this MAC OSX malware from multiple, independent sources, including customer reports and internal sources. These indicate that this malware poses a high risk to users due to the increased possibility of infection.

To get a one-glance comprehensive view of the behavior of this Backdoor, refer to the Threat Diagram shown below.

This is the Trend Micro detection for specially crafted Java files that takes advantage of a vulnerability that may allow remote arbitrary code execution on certain Mac OS X version when exploited.

It is part of the Flashback malware family that runs on Mac OS X.

This backdoor may be dropped by other malware.

  TECHNICAL DETAILS

File Size:

59,844 bytes

File Type:

Mach-O

Memory Resident:

Yes

Initial Samples Received Date:

05 Apr 2012

Payload:

Compromises system security

Arrival Details

This backdoor may be dropped by other malware.

NOTES:

This is the Trend Micro detection for specially crafted Java files that takes advantage of the following vulnerability to allow remote arbitrary code execution:

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

8.890.01

FIRST VSAPI PATTERN DATE:

06 Apr 2012

VSAPI OPR PATTERN File:

8.891.00

VSAPI OPR PATTERN Date:

07 Apr 2012

Step 1

Scan your computer with your Trend Micro product to delete files detected as OSX_FLASHBCK.AB. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.

Step 2

Download and apply this security patch Refrain from using these products until the appropriate patches have been installed. Trend Micro advises users to download critical patches upon release by vendors.


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