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TROJ_HWPEXPL.VTH

July 23, 2015
 Analysis by: Anthony Joe Melgarejo
 ALIASES:

Exploit.MSWord.CVE-2014-1761.a (Kaspersky), Exploit.CVE_2010_3333-1 (ClamAV)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Via email


This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It contains errors in its code. This stops it from performing its routines. It takes advantage of certain vulnerabilities.

  TECHNICAL DETAILS

File Size:

259,584 bytes

File Type:

Other

Memory Resident:

Yes

Initial Samples Received Date:

17 Jul 2015

Arrival Details

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

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

Other Details

This Trojan contains errors in its code. This stops it from performing its routines.

It takes advantage of the following vulnerabilities:

NOTES:

These are specially crafted HWP files with embedded malicious RTF files.

  SOLUTION

Minimum Scan Engine:

9.750

FIRST VSAPI PATTERN FILE:

11.802.04

FIRST VSAPI PATTERN DATE:

20 Jul 2015

VSAPI OPR PATTERN File:

11.803.00

VSAPI OPR PATTERN Date:

21 Jul 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_HWPEXPL.VTH. 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 3

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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