วันดีคืนดี Handy drive ผมเผอิญเจอไฟล์ autorun.inf และก็เจอไฟล์แปลกพวก ntdvm.exe ผมเลยลองหาแนวทางแก้ไข พบว่า
เครื่องผมติดเวิร์มที่ชื่อว่า WORM_VB.ELZ
ซึ่งเกิดจาก mulware ตัวอื่น หรืออาจจะถูกดาวโหลดมาจากเว็บ พวก malicious Web site(s). ได้ครับ
อาการ : เจ้าเวิร์มตัวนี้จะทำการคัดลอกไฟล์ที่ชื่อว่าดังต่อไปนี้
- %System%\baster.txt
- %System%\copyf.exe
- %System%\samsun.exe
- F:\ntvdm.exe
- G:\ntvdm.exe
(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)
และจะทำการสร้างไฟล์ autorun ด้วยครับ
- F:\AUTORUN.INF
- G:\AUTORUN.INF
Autostart Technique
เจ้าเวิร์มตัวนี้ใส่โค๊ดให้ windows บูตให้ตัวเองทำงานตอน login เข้าเครื่อง โดยไปแก้ไขไฟล์ใน registry ดังนี้ครับ
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\
CurrentVersion\Winlogon
Shell = "Explorer.exe samsun.exe"
วิธีการแก้ไข
(ขอ copy ของเค้ามานะครับ)
Terminating the Malware Process
This procedure terminates the running malware process.
- Open Windows Task Manager.
• On Windows 98 and ME, press
CTRL+ALT+DELETE
• On Windows NT, 2000, XP, and Server 2003, press
CTRL+SHIFT+ESC, then click the Processes tab. - In the list of running programs*, locate the following processes:
• samsun.exe
• baster.txt
• copyf.exe - Select the malware process, then press either the End Task or the End Process button, depending on the version of Windows on your computer.
- To check if the malware process has been terminated, close Task Manager, and then open it again.
- Close Task Manager.
*NOTE: On computers running Windows 98 and ME, Windows Task Manager may not show certain processes. You can use a third party process viewer such as Process Explorer to terminate the malware process.
If the process you are looking for is not in the list displayed by Task Manager or Process Explorer, continue with the next solution procedure. If the malware process is in the list displayed by either Task Manager or Process Explorer, but you are unable to terminate it, restart your computer in safe mode.
Restoring Other Registry Entries
This solution modifies registry entries modified by this malware. Before performing the steps below, make sure you know how to back up the registry and how to restore it if a problem occurs. Refer to this Microsoft article for more information about modifying your computer's registry.
- Open Registry Editor. Click Start>Run, type REGEDIT, then press Enter.
- In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>
CurrentVersion>Winlogon - In the right panel, locate the entry:
Shell = "Explorer.exe samsun.exe" - Right-click on the value name and choose Modify. Change the value data of this entry to:
Explorer.exe - Close Registry Editor.
Deleting Malware-created AUTORUN.INF/s
- Right-click Start then click Search... or Find..., depending on the version of Windows you are running.
- In the Named input box, type:
AUTORUN.INF - In the Look In drop-down list, select a drive, then press Enter.
- Select the file, then open using Notepad.
- Check if the following lines are present in the file:
shellexecute = ntvdm.exe - If the lines are present, delete the file.
- Repeat steps 3 to 6 for AUTORUN.INF files in the remaining removable drives.
- Close Search Results.
Important Windows ME/XP Cleaning Instructions
Users running Windows ME and XP must disable System Restore to allow full scanning of infected computers.
Users running other Windows versions can proceed with the succeeding solution set(s).
Running Trend Micro Antivirus
If you are currently running in safe mode, please restart your computer normally before performing the following solution.
Scan your computer with Trend Micro antivirus and delete files detected as WORM_VB.ELZ. To do this, Trend Micro customers must download the latest virus pattern file and scan their computer. Other Internet users can use HouseCall, the Trend Micro online virus scanner.
อ้างอิง : http://www.trendmicro.com/vinfo/virusencyclo/default5.asp?VName=WORM%5FVB%2EELZ&VSect=Sn
