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TROJ_VB.GXZ

May 10, 2013
 ALIASES:

TrojanClicker:Win32/VB.JO (Microsoft); AdClicker-FP (McAfee); Downloader (Symantec); Trojan-Clicker.Win32.VB.wt (Kaspersky); Trojan.Win32.Generic.pak!cobra (Sunbelt); May be infected by unknown virus Win32/DH{OBM2Awkn} (AVG)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This Trojan 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

File Size:

22,016 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

10 May 2013

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Other System Modifications

This Trojan adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
services

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
services
isotherad = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
services
hasinstalled = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
services
count = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
services
isconnect = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
services
isdown = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
services
update = "5/6/2013 7:44:54 PM"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
services
newver = "no"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
services
monver = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
services
bakver = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
services
newmon = "0"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\nkserv
DisplayName = "NetWork Service"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\nkserv
Description = "Provider Support for NetWork Service"

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.300

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

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\SOFTWARE\Microsoft
    • services

Step 3

Delete this registry value

[ 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\SOFTWARE\Microsoft\services
    • isotherad = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\services
    • hasinstalled = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\services
    • count = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\services
    • isconnect = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\services
    • isdown = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\services
    • update = "5/6/2013 7:44:54 PM"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\services
    • newver = "no"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\services
    • monver = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\services
    • bakver = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\services
    • newmon = "0"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\nkserv
    • DisplayName = "NetWork Service"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\nkserv
    • Description = "Provider Support for NetWork Service"

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_VB.GXZ. 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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