TSPY_DERUSBI.G
TrojanSpy:Win32/Derusbi.A (Microsoft)
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Spyware
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This spyware 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
Arrival Details
This spyware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Autostart Technique
This spyware registers as a system service to ensure its automatic execution at every system startup by adding the following registry keys:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\WMPNSSS\Parameters
Other System Modifications
This spyware adds the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\PnP
Security = "{random values}"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\SvcHost
wMedia = "WMPNSSS"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\WMPNSSS\Parameters
ServiceDll = "%SystemRoot%\system32\wmpnsss.dll"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\WMPNSSS
Description = "{random characters}"
Dropping Routine
This spyware drops the following files:
- %System%\wmpnsss.dll
(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.)
This report is generated via an automated analysis system.
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
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_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WMPNSSS
- Parameters
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\ControlSet001\Control\PnP
- Security = "{random values}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SvcHost
- wMedia = "WMPNSSS"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\WMPNSSS\Parameters
- ServiceDll = "%SystemRoot%\system32\wmpnsss.dll"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\WMPNSSS
- Description = "{random characters}"
Step 5
Search and delete this file
- %System%\wmpnsss.dll
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_DERUSBI.G. 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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