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TSPY_ZBOT.BVV

September 28, 2013
 Analysis by: Karl Dominguez
 PLATFORM:

Windows 2000, XP, Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • 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

File Size:

71,680 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

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

Minimum Scan Engine:

8.900

VSAPI OPR PATTERN File:

7.391.80

VSAPI OPR PATTERN Date:

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

[ Learn More ]

Step 3

Delete this registry key

[ Learn More ]

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

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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