Trojan.Win32.LEONEM.VSNW17C23
Trojan:Win32/Leonem (MICROSOFT)
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
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
1,521,801 bytes
EXE
No
23 Mar 2023
Drops files, Modifies system registry
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%\jsnzik3w.vlx
- %User Temp%\jsnzik3w.vlx\{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).)
It drops the following files:
- %User Temp%\SeTUP_{Random}\Setup.txt
- %User Temp%\SeTUP_{Random}\Ban.qsp
- %User Temp%\SeTUP_{Random}\Modern_Setup.bmp
- %User Temp%\SeTUP_{Random}\Modern_Icon.bmp
- %User Temp%\SeTUP_{Random}\00000#12
- %User Temp%\SeTUP_{Random}\00001#15
- %User Temp%\SeTUP_{Random}\00002#16
- %User Temp%\SeTUP_{Random}\00003#25
- %User Temp%\SeTUP_{Random}\00004#26
- %User Temp%\SeTUP_{Random}\00005#35
- %User Temp%\SeTUP_{Random}\00006#392
- %User Temp%\SeTUP_{Random}\00007#393
- %User Temp%\SeTUP_{Random}\00008#7
- %User Temp%\jsnzik3w.vlx\{Random}\Hack.exe.pif
- %User Temp%\jsnzik3w.vlx\16
- %User Temp%\jsnzik3w.vlx\25
- %User Temp%\jsnzik3w.vlx\392
- %User Temp%\jsnzik3w.vlx\26
- %User Temp%\jsnzik3w.vlx\12
- %User Temp%\jsnzik3w.vlx\35
- %User Temp%\jsnzik3w.vlx\393
- %User Temp%\jsnzik3w.vlx\15
- %User Temp%\jsnzik3w.vlx\7
- %User Temp%\jsnzik3w.vlx\{Random}\q
(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 adds the following processes:
- %User Temp%\SeTUP_{Random}\engine.exe /TH_ID=_1620 /Originexe="%User Temp%\{Malware Filename}.exe"
- %System%\CmD.exe /c cmd < 7
- cmd
- powershell get-process avastui
- powershell get-process avgui
- {Random}\Hack.exe.pif {Random}\q
- %System%\PING.eXe ping localhost -n 8
- %System%\nslookup.exe
(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.)
Other System Modifications
This Trojan adds the following registry entries:
HKEY_CURRENT_USER\Software\Rmc-LTR1UA
licence = {Hex Values}
Other Details
This Trojan adds the following registry keys:
HKEY_CURRENT_USER\Software\Rmc-LTR1UA
SOLUTION
9.800
18.337.00
23 Mar 2023
18.337.00
24 Mar 2023
Step 1
Trend Micro Predictive Machine Learning detects and blocks malware at the first sign of its existence, before it executes on your system. When enabled, your Trend Micro product detects this malware under the following machine learning name:
- Troj.Win32.TRX.XXPE50FFF066
Step 2
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 3
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 4
Delete this registry value
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\Rmc-LTR1UA
- licence = {Hex Values}
- licence = {Hex Values}
Step 5
Delete this registry key
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\Rmc-LTR1UA
Step 6
Search and delete this file
- %User Temp%\SeTUP_{Random}\engine.exe
- %User Temp%\SeTUP_{Random}\Setup.txt
- %User Temp%\SeTUP_{Random}\Ban.qsp
- %User Temp%\SeTUP_{Random}\Modern_Setup.bmp
- %User Temp%\SeTUP_{Random}\Modern_Icon.bmp
- %User Temp%\SeTUP_{Random}\00000#12
- %User Temp%\SeTUP_{Random}\00001#15
- %User Temp%\SeTUP_{Random}\00002#16
- %User Temp%\SeTUP_{Random}\00003#25
- %User Temp%\SeTUP_{Random}\00004#26
- %User Temp%\SeTUP_{Random}\00005#35
- %User Temp%\SeTUP_{Random}\00006#392
- %User Temp%\SeTUP_{Random}\00007#393
- %User Temp%\SeTUP_{Random}\00008#7
- %User Temp%\jsnzik3w.vlx\{Random}\Hack.exe.pif
- %User Temp%\jsnzik3w.vlx\16
- %User Temp%\jsnzik3w.vlx\25
- %User Temp%\jsnzik3w.vlx\392
- %User Temp%\jsnzik3w.vlx\26
- %User Temp%\jsnzik3w.vlx\12
- %User Temp%\jsnzik3w.vlx\35
- %User Temp%\jsnzik3w.vlx\393
- %User Temp%\jsnzik3w.vlx\15
- %User Temp%\jsnzik3w.vlx\7
- %User Temp%\jsnzik3w.vlx\{Random}\q
Step 7
Search and delete this folder
- %User Temp%\jsnzik3w.vlx\{Random}
- %User Temp%\jsnzik3w.vlx
Step 8
Scan your computer with your Trend Micro product to delete files detected as Trojan.Win32.LEONEM.VSNW17C23. 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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