TSPY_DERUSBI.D
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Spyware
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
This spyware may arrive bundled with malware packages as a malware component. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It is a component of other malware.
It requires its main component to successfully perform its intended routine.
TECHNICAL DETAILS
Arrival Details
This spyware may arrive bundled with malware packages as a malware component.
It 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 spyware drops the following copies of itself into the affected system:
- %System%\msusb{random 3 letters}.dat
(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.)
It drops the following non-malicious file:
- %Windows%\Temp\ziptmp$1.tmp21
(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
It is a component of other malware.
Autostart Technique
This spyware modifies the following registry entries to ensure it automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\wuauserv\Parameters
ServiceDll = %Systemroot%\System32\msusb{random 3 letters}.dat
(Note: The default value data of the said registry entry is %System%\wuauserv.dll.)
Other System Modifications
This spyware adds the following registry entries as part of its installation routine:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\wuauserv\Parameters
Security = {random values}
Other Details
This spyware requires its main component to successfully perform its intended routine.
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\SYSTEM\CurrentControlSet\Services\wuauserv\Parameters
- From: ServiceDll = %Systemroot%\System32\msusb{random 3 letters}.dat
To: ServiceDll = %System%\wuauserv.dll
- From: ServiceDll = %Systemroot%\System32\msusb{random 3 letters}.dat
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\SYSTEM\CurrentControlSet\Services\wuauserv\Parameters
Step 5
Search and delete these files
- %Windows%\Temp\ziptmp$1.tmp21
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_DERUSBI.D. 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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