Trojan.W97M.THANOS.THABGBA

March 01, 2021
 Analysis by: Karen Ivy Titiwa
 ALIASES:

Trojan.GenericKD.36225763 (BITDEFENDER); TrojanDownloader:O97M/EncDoc.SKM!MTB(MICROSOFT)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware, Spammed via email

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

As of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size:

84,997 bytes

File Type:

XLS

Memory Resident:

Yes

Initial Samples Received Date:

27 Jan 2021

Payload:

Connects to URLs/IPs, Displays graphics/image

Arrival Details

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

It 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 adds the following processes:

  • C:\wCmfmRe\dtwzrQf\GZTJoxx.exe

It creates the following folders:

  • C:\wCmfmRe
  • C:\wCmfmRe\dtwzrQf

Download Routine

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

  • https://{BLOCKED}dtrac.xyz/3/bbc.exe

It saves the files it downloads using the following names:

  • C:\wCmfmRe\dtwzrQf\GZTJoxx.exe

As of this writing, the said sites are inaccessible.

Other Details

This Trojan does the following:

  • This Trojan is a password protected file.
  • When a correct password is given, it displays the following to trick users into enabling the embedded malicious macro.

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

16.568.03

FIRST VSAPI PATTERN DATE:

01 Mar 2021

VSAPI OPR PATTERN File:

16.569.00

VSAPI OPR PATTERN Date:

02 Mar 2021

Step 1

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 2

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 3

Scan your computer with your Trend Micro product to delete files detected as Trojan.W97M.THANOS.THABGBA. 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:

Step 4

Search and delete these folders

[ 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.
  • C:\wCmfmRe


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