Analysis by: Michael Cabel
 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

Infection Channel: Downloaded from the Internet, Dropped by other malware

This malware is the Flashback Mac Trojan Horse that installs itself by exploiting two certain Java vulnerabilities.

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

This malware injects itself in Web browsers and applications to steal sensitive data such as usernames and passwords.

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: 424,292 bytes
File Type: Mach-O
Initial Samples Received Date: 24 Feb 2012
Payload: Steals information

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 non-malicious files:

  • /Users/Shared/.svcdmp
  • ~/.MACOSX/environment.plist
  • ~/Library/Logs/vmLog

It drops the following copies of itself into the affected system:

  • /Users/Shared/.{Random File Name}.so

NOTES:
This malware injects itself in Web browsers and applications to steal sensitive data such as usernames and passwords.

  SOLUTION

Minimum Scan Engine: 9.200
FIRST VSAPI PATTERN FILE: 8.798.03
FIRST VSAPI PATTERN DATE: 24 Feb 2012
VSAPI OPR PATTERN File: 8.799.00
VSAPI OPR PATTERN Date: 25 Feb 2012

Scan your computer with your Trend Micro product to delete files detected as OSX_FLASHBCK.IC. 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.

NOTES:

To delete the dropped file:

  1. Open a Terminal window. To open a terminal window, double-click "Applications > Utilities > Terminal" in Finder.
  2. In the Terminal window, type the following command:

    rm /Users/Shared/.svcdmp
    rm ~/.MACOSX/environment.plist
    rm ~/Library/Logs/vmLog
  3. Close Terminal by pressing (Command) + Q.


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