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W97M_DLOAD.WMI

October 29, 2014
 Analysis by: Francis Xavier Antazo
 ALIASES:

W97M/Downloader (McAfee), W97M/Dloader.BCC!tr (Fortinet)

 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

Infection Channel:

Downloaded from the Internet, Via email


This Trojan arrives as attachment to mass-mailed email messages. It may be unknowingly downloaded by a user while visiting malicious websites.

It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

  TECHNICAL DETAILS

File Size:

114,688 bytes

File Type:

DOC

Memory Resident:

No

Initial Samples Received Date:

23 Oct 2014

Payload:

Connects to URLs/IPs, Downloads files

Arrival Details

This Trojan arrives as attachment to mass-mailed email messages.

It may be unknowingly downloaded by a user while visiting malicious websites.

Download Routine

This Trojan downloads the file from the following URL and renames the file when stored in the affected system:

  • http://{BLOCKED}center.ru/dbanner.png

It saves the files it downloads using the following names:

  • %System Root%\JGSNUWKJRFC.exe

(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)

Trend Micro detects the dowloaded file as:

  • TROJ_CRYPLOCK.FC

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

11.196.05

FIRST VSAPI PATTERN DATE:

07 Oct 2014

VSAPI OPR PATTERN File:

11.197.00

VSAPI OPR PATTERN Date:

07 Oct 2014

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 W97M_DLOAD.WMI. (Note: Please skip this step if the threats listed below have already been removed.)

    • TROJ_CRYPLOCK.FC

Step 3

Enable the macro virus protection in Microsoft Office Applications

[ Learn More ]

Step 4

Scan your computer with your Trend Micro product to delete files detected as W97M_DLOAD.WMI. 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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