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TROJ_MDROPR.LB

March 28, 2012
 Analysis by: Cris Nowell Pantanilla
 PLATFORM:

Mac OS

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Spammed via email

This Trojan comes as an attachment to spammed email. It carries with it a backdoor that runs on Mac OS X systems.

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

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

It executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

DOC

Initial Samples Received Date:

28 Mar 2012

Payload:

Drops files

Arrival Details

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

Installation

This Trojan drops and executes the following files:

  • /tmp/launch-hs - a script that loads /tmp/launch-hse and /tmp/file.doc
  • /tmp/launch-hse - detected by Trend Micro as either OSX_KONTROL.HVN or OSX_KONTROL.EVL

It drops the following non-malicious file:

  • /tmp/file.doc

Dropping Routine

This Trojan takes advantage of the following software vulnerabilities to drop malicious files:

It executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

NOTES:
This malware is a Microsoft Word document file. If opened in Windows OS, the malicious routine does not execute successfully. However, if opened in Mac OS X, the malicious routine executes successfully.

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

8.870.05

FIRST VSAPI PATTERN DATE:

28 Mar 2012

VSAPI OPR PATTERN File:

8.871.00

VSAPI OPR PATTERN Date:

29 Mar 2012

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Remove malware/grayware files dropped/downloaded by TROJ_MDROPR.LB

Step 3

Search and delete these files

[ Learn More ]
There may be some component files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files and folders in the search result.
  • /tmp/launch-hs
  • /tmp/file.doc

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_MDROPR.LB. 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 5

Download and apply these security patches 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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