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Trojan.Win32.NEGASTEAL.YXCKG

November 14, 2022
 Analysis by: Ricardo III Valdez
 ALIASES:

Trojan:Win32/Leonem (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


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:

2,097,152 bytes

Memory Resident:

No

Initial Samples Received Date:

07 Nov 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%\10_67\__tmp_rar_sfx_access_check_4222369
  • %User Temp%\10_67\hpvllavp.jvt
  • %User Temp%\10_67\vwag.pdf
  • %User Temp%\10_67\rlioqj.xhj
  • %User Temp%\10_67\dmfq.vbe
  • %User Temp%\10_67\awxdaxro.exe
  • %User Temp%\10_67\ronnai.docx
  • %User Temp%\10_67\arglt.pdf
  • %User Temp%\10_67\sahvnb.ppt
  • %User Temp%\10_67\hoodauufem.dll
  • %User Temp%\10_67\qemcw.dat
  • %User Temp%\10_67\swdektj.ppt
  • %User Temp%\10_67\jqfatpw.icm
  • %User Temp%\10_67\pnptxqqdi.xls
  • %User Temp%\10_67\vhtc.pdf
  • %User Temp%\10_67\dimall.xml
  • %User Temp%\10_67\qttnpkxh.jpg
  • %User Temp%\10_67\jqjmiknxa.pdf
  • %User Temp%\10_67\cxsoawnji.txt
  • %User Temp%\10_67\hdck.xls
  • %User Temp%\10_67\jlkvebatb.dll
  • %User Temp%\10_67\wkbeet.docx
  • %User Temp%\10_67\rhmjio.icm
  • %User Temp%\10_67\buxixv.dat
  • %User Temp%\10_67\stlt.xl
  • %User Temp%\10_67\olhxrcqn.log
  • %User Temp%\10_67\ouudetc.xls
  • %User Temp%\10_67\llgld.ini
  • %User Temp%\10_67\qjvucledoi.log
  • %User Temp%\10_67\xqigwfvdg.docx
  • %User Temp%\10_67\tsvm.docx
  • %User Temp%\10_67\bmipbhelb.icm
  • %User Temp%\10_67\hexh.jpg
  • %User Profile%\temp\vwag.pdf

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

It adds the following processes:

  • %System%\WScript.exe %User Temp%\10_67\dmfq.vbe
  • %User Temp%\10_67\awxdaxro.exe rlioqj.xhj

(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).)

It creates the following folders:

  • %User Temp%\10_67
  • %User Profile%\temp

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

Other System Modifications

This Trojan deletes the following files:

  • %User Temp%\10_67\__tmp_rar_sfx_access_check_4222369

(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).)

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

17.928.04

FIRST VSAPI PATTERN DATE:

05 Nov 2022

VSAPI OPR PATTERN File:

17.929.00

VSAPI OPR PATTERN Date:

06 Nov 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.  
  • %User Temp%\10_67\__tmp_rar_sfx_access_check_4222369
  • %User Temp%\10_67\hpvllavp.jvt
  • %User Temp%\10_67\vwag.pdf
  • %User Temp%\10_67\rlioqj.xhj
  • %User Temp%\10_67\dmfq.vbe
  • %User Temp%\10_67\awxdaxro.exe
  • %User Temp%\10_67\ronnai.docx
  • %User Temp%\10_67\arglt.pdf
  • %User Temp%\10_67\sahvnb.ppt
  • %User Temp%\10_67\hoodauufem.dll
  • %User Temp%\10_67\qemcw.dat
  • %User Temp%\10_67\swdektj.ppt
  • %User Temp%\10_67\jqfatpw.icm
  • %User Temp%\10_67\pnptxqqdi.xls
  • %User Temp%\10_67\vhtc.pdf
  • %User Temp%\10_67\dimall.xml
  • %User Temp%\10_67\qttnpkxh.jpg
  • %User Temp%\10_67\jqjmiknxa.pdf
  • %User Temp%\10_67\cxsoawnji.txt
  • %User Temp%\10_67\hdck.xls
  • %User Temp%\10_67\jlkvebatb.dll
  • %User Temp%\10_67\wkbeet.docx
  • %User Temp%\10_67\rhmjio.icm
  • %User Temp%\10_67\buxixv.dat
  • %User Temp%\10_67\stlt.xl
  • %User Temp%\10_67\olhxrcqn.log
  • %User Temp%\10_67\ouudetc.xls
  • %User Temp%\10_67\llgld.ini
  • %User Temp%\10_67\qjvucledoi.log
  • %User Temp%\10_67\xqigwfvdg.docx
  • %User Temp%\10_67\tsvm.docx
  • %User Temp%\10_67\bmipbhelb.icm
  • %User Temp%\10_67\hexh.jpg
  • %User Profile%\temp\vwag.pdf

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%\10_67
  • %User Profile%\temp

Step 5

Scan your computer with your Trend Micro product to delete files detected as Trojan.Win32.NEGASTEAL.YXCKG. 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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