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Trojan.X97M.EMOTET.BL

March 08, 2022
 Analysis by: Bren Matthew Ebriega
 ALIASES:

TrojanDownloader:O97M/Emotet.AM!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


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:

94,225 bytes

File Type:

Other

Memory Resident:

No

Initial Samples Received Date:

09 Feb 2022

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 files:

  • %ProgramData%\yhjlswle.vbs
  • %ProgramData%\ughldskbhn.bat

(Note: %ProgramData% is a version of the Program Files folder where any user on a multi-user computer can make changes to programs. This contains application data for all users. This is usually C:\ProgramData on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit), or C:\Documents and Settings\All Users on Windows Server 2003(32-bit), 2000(32-bit) and XP.)

It adds the following processes:

  • cmd /c ""%ProgramData%\ughldskbhn.bat" "
  • powershell -enc {base64 encoded command}
  • "%System%\cmd.exe" /c start /B %Windows%\syswow64\rundll32.exe %ProgramData%\bneuihlows.dll,hjyldksfkw3
  • wscript %ProgramData%\yhjlswle.vbs

(Note: %ProgramData% is a version of the Program Files folder where any user on a multi-user computer can make changes to programs. This contains application data for all users. This is usually C:\ProgramData on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit), or C:\Documents and Settings\All Users on Windows Server 2003(32-bit), 2000(32-bit) and XP.. %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:

  • http://ha{BLOCKED}ducts.com/Merchant2/ARsf1LIcOauhH1rDrIh/
  • http://h{BLOCKED}eo.com/eln-images/zqqgZ0YXaPiWbF/
  • http://ma{BLOCKED}g.t{BLOCKED}rs.com/wp-includes/7faN9/
  • http://ch{BLOCKED}ki.com/eln-images/skSsCLJtI24kZvo/
  • http://s{BLOCKED}s.com/eln-images/AYvykzg/
  • http://er{BLOCKED}in.com/cgi/qRe8dRaG2HDNOOG1/
  • http://so{BLOCKED}s.com/cgi/9ii/
  • https://gr{BLOCKED}n.net/GLI_New/JRlt3mOiezE/
  • https://on-l{BLOCKED}es.com/cgi/ks0Mp/
  • http://su{BLOCKED}t.com/eln-images/sO4XvFBsevCRf/
  • http://b{BLOCKEDg.l{BLOCKED}.com/wp-content/19G04LjA1UcE1tN8/
  • http://i{BLOCKED}g.ta{BLOCKED}ors.com/wp-includes/MGGi5zcZrkolFH9/

It saves the files it downloads using the following names:

  • %ProgramData%\bneuihlows.dll

(Note: %ProgramData% is a version of the Program Files folder where any user on a multi-user computer can make changes to programs. This contains application data for all users. This is usually C:\ProgramData on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit), or C:\Documents and Settings\All Users on Windows Server 2003(32-bit), 2000(32-bit) and XP.)

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

17.374.02

FIRST VSAPI PATTERN DATE:

10 Feb 2022

VSAPI OPR PATTERN File:

17.375.00

VSAPI OPR PATTERN Date:

11 Feb 2022

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.  
  • %ProgramData%\yhjlswle.vbs
  • %ProgramData%\ughldskbhn.bat
  • %ProgramData%\bneuihlows.dll

Step 4

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