Trojan.VBS.EMOTET.D

March 30, 2023
 Analysis by: Francesca Villasanta
 ALIASES:

Trojan:VBS/Emotet.SSJ!MTB [non_writable_container] (MICROSOFT); Script:SNH-gen [Trj] (AVAST)

 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:

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:

268,308 bytes

File Type:

Other

Memory Resident:

Yes

Initial Samples Received Date:

28 Mar 2023

Payload:

Connects to URLs/IPs, Modifies system registry, Drops 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 folders:

  • %User Temp%\rad{Random}dar
  • %System%\{Random}

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

It drops the following files:

  • %User Temp%\OneNote\16.0\Exported\{{GUID}}\NT\0\press to unblock document.vbs
  • %User Temp%\rad{Random}dar.txt
  • %User Temp%\rad{Random}.tmp.zip
  • %User Temp%\rad{Random}dar\I7BUGMOAp1mnW79z5M0bLi0WI5oFMy2wIqc.dll
  • %System%\{Random}\{Random characters}.dll

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

It adds the following processes:

  • %System%\WScript.exe "%User Temp%\OneNote\16.0\Exported\{{GUID}}\NT\0\press to unblock document.vbs"
  • %System%\wscript.exe //E:vbscript %User Temp%\rad{Random}dar.txt
  • %System%\regsvr32.exe "%User Temp%\rad{Random}dar\I7BUGMOAp1mnW79z5M0bLi0WI5oFMy2wIqc.dll"
  • %System%\regsvr32.exe "%System%\{Random}\{Random character}.dll"

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
I7BUGMOAp1mnW79z5M0bLi0WI5oFMy2wIqc.dll = %System%\regsvr32.exe "%User Temp%\rad{Random}dar\I7BUGMOAp1mnW79z5M0bLi0WI5oFMy2wIqc.dll"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
{Random characters}.dll = %System%\regsvr32.exe "%System%\{Random}\{Random characters}.dll"

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}dyator.com.tr/Areas/1Dg2PeStqNlOjuPP3fu/
  • http://{BLOCKED}a.pro/dqvoakrc/Hh9
  • http://{BLOCKED}l.chatzy.in/k7daqAXFTBus7mkuwwC/UQ9Y8RRqo0Q9
  • http://{BLOCKED}rosciences1.hospedagemdesites.ws/grupotoia/CPKU5ZE

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

18.352.03

FIRST VSAPI PATTERN DATE:

30 Mar 2023

VSAPI OPR PATTERN File:

18.353.00

VSAPI OPR PATTERN Date:

31 Mar 2023

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

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

 
  • In HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • I7BUGMOAp1mnW79z5M0bLi0WI5oFMy2wIqc.dll = %System%\regsvr32.exe "%User Temp%\rad{Random}dar\I7BUGMOAp1mnW79z5M0bLi0WI5oFMy2wIqc.dll"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • {Random characters}.dll = %System%\regsvr32.exe "%System%\{Random}\{Random characters}.dll"

Step 4

Search and delete files detected as Trojan.VBS.EMOTET.D

[ 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.
  • %User Temp%\OneNote\16.0\Exported\{{GUID}}\NT\0\press to unblock document.vbs
  • %User Temp%\rad{Random}dar.txt
  • %User Temp%\rad{Random}.tmp.zip
  • %User Temp%\rad{Random}dar\I7BUGMOAp1mnW79z5M0bLi0WI5oFMy2wIqc.dll
  • %System%\{Random}\{Random characters}.dll

Step 5

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.
  • %User Temp%\rad{Random}dar
  • %System%\{Random}

Step 6

Scan your computer with your Trend Micro product to clean files detected as Trojan.VBS.EMOTET.D. 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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