TSPY_ZBOT.TAV
Windows 2000, XP, Server 2003
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Spyware
Destructiveness: No
Encrypted: No
In the wild: Yes
TECHNICAL DETAILS
Installation
This spyware drops the following files:
- %WINDOWS%\jh87uhnoe3\ewfrvbb.nls
- %WINDOWS%\jh87uhnoe3\ewf32.nls
- %WINDOWS%\host32.exe
It creates the following folders:
- %WINDOWS%\jh87uhnoe3
Autostart Technique
This spyware modifies the following registry entries to ensure it automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Userinit = %System%\userinit.exe,%Windows%\svchost32.exe,
(Note: The default value data of the said registry entry is %System%\userinit.exe,.)
Other System Modifications
This spyware adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\ CurrentVersion\Network
PID = {Computer name}_{Random numbers}
SOLUTION
Step 1
For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
Step 2
Restart in Safe Mode
Step 3
Restore this modified 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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
- From: Userinit =%System%\userinit.exe,%Windows%\svchost32.exe,
To: %System%\userinit.exe,
- From: Userinit =%System%\userinit.exe,%Windows%\svchost32.exe,
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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\ CurrentVersion\Network
- PID={Computer name}_{Random numbers}
- PID={Computer name}_{Random numbers}
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_ZBOT.TAV. 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.
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