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Trojan.X97M.EMOTET.YXBLDZ

December 21, 2021
 Analysis by: Khristian Joseph Morales
 ALIASES:

TrojanDownloader:O97M/EncDoc.SSMC!MTB (MICROSOFT)

 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, Dropped by other malware


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.

  TECHNICAL DETAILS

File Size:

38,223 bytes

File Type:

Other

Memory Resident:

No

Initial Samples Received Date:

06 Dec 2021

Payload:

Connects to URLs/IPs, Displays graphics/image, Modifies system registry, 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 adds the following processes:

  • %Windows%\SysWow64\rundll32.exe {parent directory of default excel save path}\besta.ocx, {random numbers}

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

Download Routine

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

  • https://{BLOCKED}compacthomes.com.au/uninsulting/8rhMBnRbt77/
  • https://{BLOCKED}phoproductions.co.za/1TOorPQE6ipicDUCaozfS/
  • http://hipma.{BLOCKED}m.ac.id/wp-admin/vj9pl9UamhYFDy/

It saves the files it downloads using the following names:

  • {parent directory of default excel save path}\besta.ocx → Detected as TrojanSpy.Win32.EMOTET.YXBLCZ

NOTES:

This Trojan does the following:

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

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

17.233.00

FIRST VSAPI PATTERN DATE:

04 Dec 2021

VSAPI OPR PATTERN File:

17.234.00

VSAPI OPR PATTERN Date:

05 Dec 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

Search and delete these files

[ Learn More ]
There may be some 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.  
  • {parent directory of default excel save path}\besta.ocx

Step 4

Scan your computer with your Trend Micro product to delete files detected as Trojan.X97M.EMOTET.YXBLDZ. 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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