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 creates the following folders:
- %Program Files% (x64)
- %Program Files% (x64)\Microsoft Silverlight
- %Program Files% (x64)\Reference Assemblies
- %Program Files% (x64)\Microsoft.NET
- %Program Files% (x64)\Internet Explorer
- %Program Files% (x64)\Windows Media Player
(Note: %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.)
Dropping Routine
This Trojan drops the following files:
- %Program Files% (x64)\Microsoft.NET\mqvsz.exe
- %User Temp%\1.dll
(Note: %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.. %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
Other Details
This Trojan connects to the following possibly malicious URL:
- http://scroll.{BLOCKED}i.co.kr/scr/scrollz.exe
- http://tens.{BLOCKED}4.com/rulpc/p3/4.ini
- {BLOCKED}2.95.90
- {BLOCKED}1.161.98
This report is generated via an automated analysis system.
Step 1
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Step 2
Search and delete these components
[ Learn More ]
[ back ]
There may be some components 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.
- %Program Files% (x64)\Microsoft.NET\mqvsz.exe
- %User Temp%\1.dll
To manually delete a malware/grayware file from an affected system:
• For Windows 2000, Windows XP, and Windows Server 2003:
- Right-click Start then click Search....
- In the File name* input box, type the following:
- %Program Files% (x64)\Microsoft.NET\mqvsz.exe
- %User Temp%\1.dll
- In the Look In drop-down list, select My Computer then press Enter.
- Once located, select the file then press SHIFT+DELETE to delete it.
*Note: The file name input box title varies depending on the Windows version (e.g. Search for files or folders named or All or part of the file name.).
• For Windows Vista, Windows 7, Windows Server 2008, Windows 8, Windows 8.1, and Windows Server 2012:
- Open a Windows Explorer window.
- For Windows Vista, 7, and Server 2008 users, click Start>Computer.
- For Windows 8, 8.1, and Server 2012 users, right-click on the lower left corner of the screen,then click File Explorer.
- In the Search Computer/This PC input box, type:
- %Program Files% (x64)\Microsoft.NET\mqvsz.exe
- %User Temp%\1.dll
- 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.
Step 3
Search and delete these folders
[ Learn More ]
[ back ]
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.
- %Program Files% (x64)
- %Program Files% (x64)\Microsoft Silverlight
- %Program Files% (x64)\Reference Assemblies
- %Program Files% (x64)\Microsoft.NET
- %Program Files% (x64)\Internet Explorer
- %Program Files% (x64)\Windows Media Player
To delete malware/grayware/spyware folders:
For Windows 2000, Windows XP, and Windows Server 2003:
- Right-click Start then click Search... or Find..., depending on the version of Windows you are running.
- In the File name* input box, type:
- %Program Files% (x64)
- %Program Files% (x64)\Microsoft Silverlight
- %Program Files% (x64)\Reference Assemblies
- %Program Files% (x64)\Microsoft.NET
- %Program Files% (x64)\Internet Explorer
- %Program Files% (x64)\Windows Media Player
- In the Look In drop-down list, select My Computer, then press Enter.
- Once located, select the folder then press SHIFT+DELETE to permanently delete the folder.
- Repeat steps 2 to 4 for the remaining folders:
- %Program Files% (x64)
- %Program Files% (x64)\Microsoft Silverlight
- %Program Files% (x64)\Reference Assemblies
- %Program Files% (x64)\Microsoft.NET
- %Program Files% (x64)\Internet Explorer
- %Program Files% (x64)\Windows Media Player
*Note: The file name input box title varies depending on the Windows version (e.g. Search for files or folders named or All or part of the file name.).
For Windows Vista, Windows 7, Windows Server 2008, Windows 8, Windows 8.1, and Windows Server 2012:
- Open a Windows Explorer window.
- For Windows Vista, 7, and Server 2008 users, click Start>Computer.
- For Windows 8, 8.1, and Server 2012 users, right-click on the lower left corner of the screen, then click File Explorer.
- In the Search Computer/This PC input box, type:
- %Program Files% (x64)
- %Program Files% (x64)\Microsoft Silverlight
- %Program Files% (x64)\Reference Assemblies
- %Program Files% (x64)\Microsoft.NET
- %Program Files% (x64)\Internet Explorer
- %Program Files% (x64)\Windows Media Player
- Once located, select the file then press SHIFT+DELETE to permanently delete the folder.
- Repeat steps 2-3 for the remaining folders:
- %Program Files% (x64)
- %Program Files% (x64)\Microsoft Silverlight
- %Program Files% (x64)\Reference Assemblies
- %Program Files% (x64)\Microsoft.NET
- %Program Files% (x64)\Internet Explorer
- %Program Files% (x64)\Windows Media Player
*Note: Read the following Microsoft page if these steps do not work on Windows 7.
Step 4
Scan your computer with your Trend Micro product to delete files detected as TROJ_DLOADER.YMNGK. 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 this Knowledge Base page for more information.
