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TROJ_MALDOC.YHX

November 17, 2017
 ALIASES:

Trojan-Downloader.VBS.Agent.cnu (Kaspersky); TrojanDownloader:VBS/Vibrio.P (Microsoft); W97M.Downloader (Norton); VBS/DwnLdr-UTB (Sophos Lite)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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

This is the Trend Micro detection for files that exhibit certain behaviors.

  TECHNICAL DETAILS

File Size:

149,159 bytes

File Type:

DOC

Memory Resident:

No

Initial Samples Received Date:

14 Nov 2017

Arrival Details

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

Other Details

This is the Trend Micro detection for:

  • Microsoft Word documents that has an embedded malicious Visual Basic Script file. The VBS file is disguised as an image that tricks the user into clicking this attachment. Once double-clicked, the malicious VBS file will be executed to perform its malicious routines.

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.784.03

FIRST VSAPI PATTERN DATE:

15 Nov 2017

VSAPI OPR PATTERN File:

13.785.00

VSAPI OPR PATTERN Date:

16 Nov 2017

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

Identify and terminate files detected as TROJ_MALDOC.YHX

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 3

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