TSPY_ZBOT.WBA

November 23, 2013
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 INFORMATION EXPOSURE:

  • 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

File Size:

563,190 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

23 Nov 2013

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.

Other System Modifications

This spyware adds the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\SOFTWARE\
Microsoft\Security Center

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
EnableFirewall = "1"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
DisableNotifications = "1"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
DoNotAllowExceptions = "1"

HKEY_LOCAL_MACHINE\SYSTEM\SOFTWARE\
Microsoft\Security Center
FirstRunDisabled = "0"

HKEY_LOCAL_MACHINE\SYSTEM\SOFTWARE\
Microsoft\Security Center
AntiVirusDisableNotify = "0"

HKEY_LOCAL_MACHINE\SYSTEM\SOFTWARE\
Microsoft\Security Center
FirewallDisableNotify = "0"

HKEY_LOCAL_MACHINE\SYSTEM\SOFTWARE\
Microsoft\Security Center
UpdatesDisableNotify = "0"

HKEY_LOCAL_MACHINE\SYSTEM\SOFTWARE\
Microsoft\Security Center
AntiVirusOverride = "0"

HKEY_LOCAL_MACHINE\SYSTEM\SOFTWARE\
Microsoft\Security Center
FirewallOverride = "0"

Dropping Routine

This spyware drops the following files:

  • %User Temp%\aut1.tmp
  • %User Temp%\teanfrw

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

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\SYSTEM\SOFTWARE\Microsoft
    • Security Center

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\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile
    • EnableFirewall = "1"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile
    • DisableNotifications = "1"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile
    • DoNotAllowExceptions = "1"
  • In HKEY_LOCAL_MACHINE\SYSTEM\SOFTWARE\Microsoft\Security Center
    • FirstRunDisabled = "0"
  • In HKEY_LOCAL_MACHINE\SYSTEM\SOFTWARE\Microsoft\Security Center
    • AntiVirusDisableNotify = "0"
  • In HKEY_LOCAL_MACHINE\SYSTEM\SOFTWARE\Microsoft\Security Center
    • FirewallDisableNotify = "0"
  • In HKEY_LOCAL_MACHINE\SYSTEM\SOFTWARE\Microsoft\Security Center
    • UpdatesDisableNotify = "0"
  • In HKEY_LOCAL_MACHINE\SYSTEM\SOFTWARE\Microsoft\Security Center
    • AntiVirusOverride = "0"
  • In HKEY_LOCAL_MACHINE\SYSTEM\SOFTWARE\Microsoft\Security Center
    • FirewallOverride = "0"

Step 4

Search and delete these components

[ Learn More ]
There may be some components that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %User Temp%\aut1.tmp
  • %User Temp%\teanfrw

Step 5

Scan your computer with your Trend Micro product to delete files detected as TSPY_ZBOT.WBA. 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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