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Trojan.W97M.TRICKBOT.L

March 05, 2020
 Modified by: Joshua Paul Ignacio
 ALIASES:

TrojanDownloader:O97M/Obfuse.ARJ!MTB (MICROSOFT), Trojan-Downloader.VBA.Agent (IKARUS)

 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

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

However, as of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size:

146,376 bytes

File Type:

DOC

Memory Resident:

No

Initial Samples Received Date:

01 Mar 2020

Payload:

Displays message/message boxes, Connects to URLs/IPs, Downloads files

Arrival Details

This Trojan 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 the following file(s)/component(s):

  • %Public%\hg32j.bat → creates a folder
  • %Public%\ban3j.bat → executes a powershell command (Detected as Trojan.BAT.POWLOAD.TIAOEJY)
  • %Public%\ndj34h.bat → executes the downloaded file (Detected as Trojan.BAT.TRICKBOT.AMT)

(Note: %Public% is the folder that serves as a repository of files or folders common to all users, which is usually C:\Users\Public in Windows Vista, 7, and 8.)

It creates the following folders:

  • %Public%\kjh4ek

(Note: %Public% is the folder that serves as a repository of files or folders common to all users, which is usually C:\Users\Public in Windows Vista, 7, and 8.)

Download Routine

This Trojan connects to the following URL(s) to download its component file(s):

  • http://{BLOCKED}.{BLOCKED}.27.162/GrftgretGF45

It saves the files it downloads using the following names:

  • %Public%\kjh4ek\winlogon.exe

(Note: %Public% is the folder that serves as a repository of files or folders common to all users, which is usually C:\Users\Public in Windows Vista, 7, and 8.)

Other Details

This Trojan does the following:

  • The document contains the following message details luring users to enable macro content:

However, as of this writing, the said sites are inaccessible.

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

15.718.06

FIRST VSAPI PATTERN DATE:

02 Mar 2020

VSAPI OPR PATTERN File:

15.719.00

VSAPI OPR PATTERN Date:

03 Mar 2020

Step 1

Trend Micro Predictive Machine Learning detects and blocks malware at the first sign of its existence, before it executes on your system. When enabled, your Trend Micro product detects this malware under the following machine learning name:

     
    • Downloader.VBA.TRX.XXVBAF01FF006

Step 2

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 3

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 4

Search and delete these files

[ Learn More ]
There may be some component files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files and folders in the search result.
  • %Public%\hg32j.bat
  • %Public%\ban3j.bat
  • %Public%\ndj34h.bat
  • %Public%\kjh4ek\winlogon.exe

Step 5

Search and delete this folder

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %Public%\kjh4ek

Step 6

Scan your computer with your Trend Micro product to delete files detected as Trojan.W97M.TRICKBOT.L. 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 the following Trend Micro Support pages for more information:


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