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OSX_FAVDONW.A

October 09, 2012
 Analysis by: kathleenno
 ALIASES:

Trojan-Downloader.OSX.FavDonw.c (Kaspersky); OSX/FakeAV-DWN (Sophos); Trojan-Downloader.OSX.Fav.A (Clamav); Trojan-Downloader.OSX.FavDonw (Ikarus)

 PLATFORM:

Mac OS

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Upon execution, this malware prompts the installation of fake antivirus application.

Once installed, it may download and install the fake antivirus/antispyware software, MacShield from a certain URL.

The said malware is already detected as OSX_FAKEAV.HXZ.

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

  TECHNICAL DETAILS

File Size:

71,680 bytes

File Type:

Other

Memory Resident:

Yes

Initial Samples Received Date:

06 Jun 2011

Payload:

Displays fake alerts

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Trojan drops the following files:

  • //Application/dShield.app/
  • //Application/dShield.app/Contents
  • //Application/dShield.app/Contents/Info.plist
  • //Application/dShield.app/Contents/MacOS/
  • //Application/dShield.app/Contents/MacOS/dShield
  • //Application/dShield.app/Contents/PkgInfo
  • //Application/dShield.app/Contents/Resources/{resource files}

NOTES:

Upon execution, it prompts the installation of fake antivirus application:

Once installed, it may download and install the fake antivirus/antispyware software, MacShield from the following URL:

  • http://{BLOCKED}.{BLOCKED}.162.117/mac/soft.php?affid={number}

The said malware is already detected as OSX_FAKEAV.HXZ.

  SOLUTION

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

8.206.08

FIRST VSAPI PATTERN DATE:

06 Jun 2011

NOTES:

  1. Terminating Malware Process
    Go to Applications>Utilities>Activity Monitor and terminate the process related to dShield using the "Quit Process" button.
  2. Deleting Malware File
    Go to your Applications folder and drag dShield to the Trash. You may also right-click on the application then select Move to Trash.
  3. Restart your machine
  4. Scan your computer with your Trend Micro product to delete files detected as OSX_FAVDONW.A and OSX_FAKEAV.HXZ. 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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