TSPY_ZBOT.BVV
Windows 2000, XP, Server 2003
Threat Type: Spyware
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
This spyware arrives as an attachment to email messages spammed by other malware/grayware or malicious users.
It connects to certain URLs. It may do this to remotely inform a malicious user of its installation. It may also do this to download possibly malicious files onto the computer, which puts the computer at a greater risk of infection by other threats.
TECHNICAL DETAILS
71,680 bytes
EXE
Yes
18 Aug 2010
Arrival Details
This spyware arrives as an attachment to email messages spammed by other malware/grayware or malicious users.
Installation
This spyware drops the following copies of itself into the affected system:
- %System%\Svrwsc.exe
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
Autostart Technique
This spyware registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SvrWsc
Type = 10
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SvrWsc
Start = 2
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SvrWsc
ErrorControl = 0
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SvrWsc
ImagePath = %System%\svrwsc.exe
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SvrWsc
DisplayName = Windows Security Center Service
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SvrWsc
ObjectName = LocalSystem
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SvrWsc
Description = The service provides COM APIs for independent software vendors to register and record the state of their products to the Security Center service.
Download Routine
This spyware connects to the following malicious URLs:
- http://{BLOCKED}alisp.ru
SOLUTION
8.900
7.391.80
18 Aug 2010
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
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
- SvrWsc
- SvrWsc
Step 4
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_ZBOT.BVV. 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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