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TROJ_MDLINK.A

March 18, 2015
 Analysis by: Rommel Abraham Joven
 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW


This malware is related to the discovery of the malicious use of the Insert and Link feature in Microsoft Office. Users affected by this malware may have malicious routines exhibited on their systems.

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

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.

It attempts to access certain websites. However, the websites are inaccessible as of this writing.

  TECHNICAL DETAILS

File Size:

86,016 bytes

File Type:

DOC

Memory Resident:

No

Initial Samples Received Date:

19 Feb 2015

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.

Download Routine

This Trojan accesses the following websites to download files:

  • http://www.{BLOCKED}naa.com/vb/uploaded/24b38bcf42.gif

Other Details

This Trojan attempts to access certain websites. However, the websites are inaccessible as of this writing.

NOTES:

This Trojan connects to the aforementioned URL using the Insert and Link feature found in MS Word. This feature is used so that when the link is inaccessible or cannot be loaded, it still displays the image.

  SOLUTION

Minimum Scan Engine:

9.750

FIRST VSAPI PATTERN FILE:

11.488.08

FIRST VSAPI PATTERN DATE:

19 Feb 2015

VSAPI OPR PATTERN File:

11.489.00

VSAPI OPR PATTERN Date:

20 Feb 2015

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

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