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TROJ_HWPEXPL.VTI

July 24, 2015
 Analysis by: Francis Xavier Antazo
 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, Downloaded from the Internet, Dropped by other malware

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:

268288 bytes

File Type:

Other

Memory Resident:

Yes

Initial Samples Received Date:

07 Jul 2015

Payload:

Drops files

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.

Installation

This Trojan drops and executes the following files:

  • %temp%\~tmp.dll – detected as TROJ_FAKEMS.RA

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.

It attempts to take advantage of the following vulnerabilities:

  • CVE-2014-1761
  • CVE-2010-3333

    •   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

    Remove malware/grayware files dropped/downloaded by TROJ_HWPEXPL.VTI. (Note: Please skip this step if the threats listed below have already been removed.)

       
      • TROJ_FAKEMS.RA

    Step 3

    Scan your computer with your Trend Micro product to delete files detected as TROJ_HWPEXPL.VTI. 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 4

    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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