OSX_REVIR.A

 Analysis by: Erika Bianca Mendoza

 PLATFORM:

Mac OS X

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This Mac malware disguises itself as a harmless document by dropping and executing a non-malicious .PDF file onto the affected system.

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

This Trojan connects to a certain website to download and execute a malicious file detected by Trend Micro as OSX_IMULER.A.

This Trojan may be unknowingly downloaded by a user while visiting malicious websites.

It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

  TECHNICAL DETAILS

File Size:

192,512 bytes

File Type:

ELF

Memory Resident:

No

Initial Samples Received Date:

23 Sep 2011

Payload:

Downloads files

Arrival Details

This Trojan may be unknowingly downloaded by a user while visiting malicious websites.

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

  • http://{BLOCKED}od.ru/cdmax

Trend Micro detects the dowloaded file as:

  • OSX_IMULER.A

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

NOTES:

This Trojan disguises itself as a harmless document by dropping and executing a non-malicious PDF. It creates a downloader component in the following location:

  • /tmp/host

The downloaded file is then saved in:

  • /tmp/updtdata

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

8.450.13

FIRST VSAPI PATTERN DATE:

23 Sep 2011

VSAPI OPR PATTERN File:

8.451.00

VSAPI OPR PATTERN Date:

23 Sep 2011

Step 1

Remove malware/grayware files dropped/downloaded by OSX_REVIR.A

Step 2

Scan your computer with your Trend Micro product to delete files detected as OSX_REVIR.A. 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.


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