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TSPY_ZBOT.ADXK
Aliases: Troj/Zbot-HKR(Sophos), Trojan-Spy.Win32.Zbot.rexa(Kaspersky), Trojan:Win32/CoinMiner.T(Microsoft), Win32/Spy.Zbot.AAU(Eset)
Malware type: Spyware
Destructive: No
Platform: Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
Encrypted: Yes
In the wild: Yes

Overview


Infection Channel: Dropped by other malware, Downloaded from the Internet

This spyware may be dropped by other malware.

It steals email addresses from the Windows Address Book (WAB).

It deletes itself after execution.

Technical Details


File size: 423,424 bytes
File type: EXE
Memory resident: Yes
Initial samples received date: 11 Jan 2014
Payload: Connects to URLs/IPs

Arrival Details

This spyware may be dropped by the following malware:

  • TROJ_UPATRE.SMAI

It may be downloaded from the following remote sites:

  • https://{BLOCKED}headnails.com/wp-content/uploads/2011/10/pdf.exe

Installation

This spyware drops the following copies of itself into the affected system and executes them:

  • %Application Data%\{Random Folder}\{Random Filename}.exe

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

It drops the following non-malicious file:

  • %Application Data%\Microsoft\Address Book\{Username}.wab

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

It creates the following folders:

  • %Application Data%\{Random Folder}
  • %Application Data%\Microsoft\Address Book

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

It injects codes into the following process(es):

  • All User Processes

Autostart Technique

This spyware adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{Malware Filename} = "%Application Data%\{Random Folder}\{Random Filename}.exe"

Other System Modifications

This spyware adds the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
{Random Key}

HKEY_CURRENT_USER\Software\Microsoft\
WAB

HKEY_CURRENT_USER\Software\Microsoft\
WAB\WAB4

HKEY_CURRENT_USER\Software\Microsoft\
WAB\WAB4\Wab File Name

HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
{Random Key}
{Random} = "{Random Value}"

HKEY_CURRENT_USER\Software\Microsoft\
WAB\WAB4
OlkContactRefresh = "0"

HKEY_CURRENT_USER\Software\Microsoft\
WAB\WAB4
OlkFolderRefresh = "0"

It creates the following registry entry(ies) to bypass Windows Firewall:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\GloballyOpenPorts\
List
6967:UDP = "6967:UDP:*:Enabled:UDP 6967"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\GloballyOpenPorts\
List
8628:TCP = "8628:TCP:*:Enabled:TCP 8628"

Information Theft

This spyware steals email addresses from the Windows Address Book (WAB).

Other Details

This spyware connects to the following URL(s) to check for an Internet connection:

  • http://www.google.com/
  • http://www.bing.com/

It deletes itself after execution.

NOTES:

This spyware uses the following mutex names:

  • Local\{GUID}
  • Global\{GUID}

It avoids to inject codes in all system processes.

It attempts to download its configuration file by connecting to randomly generated IP addresses. The configuration file may contain URLs where it downloads an updated copy of itself and where it sends its gathered information. It may also contain URLs of its target online banking and finance-related sites from where it steals the information.

It also collects information when it finds the following strings in running processes:

  • bancline
  • bankman
  • cruisenet
  • dirclt32.exe
  • episys
  • fastdoc
  • fdmaster.exe
  • fidelity
  • gplusmain
  • jack henry
  • launchpadshell.exe
  • micrsolv
  • pcsws.exe
  • prologue.exe
  • silverlake
  • tellerplus
  • v48d0250s1
  • vantiv
  • wtng.exe

Solution


Minimum scan engine: 9.700
First VSAPI Pattern File: 10.630.08
First VSAPI Pattern Release Date: 20 Jan 2014
VSAPI OPR Pattern Version: 10.631.00
VSAPI OPR Pattern Release Date: 26 Feb 2014

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

Remove the malware/grayware file that dropped/downloaded TSPY_ZBOT.ADXK

Step 3

Scan your computer with your Trend Micro product and note files detected as TSPY_ZBOT.ADXK

Step 4

Restart in Safe Mode

[ Learn more ]

Step 5

Delete the registry entry with an unknown data 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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • {Malware Filename} = "%Application Data%\{Random Folder}\{Random Filename}.exe"

Step 6

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_CURRENT_USER\Software\Microsoft
    • WAB
  • In HKEY_CURRENT_USER\Software\Microsoft
    • Internet Account Manager

Step 7

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\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\GloballyOpenPorts\List
    • 6967:UDP = "6967:UDP:*:Enabled:UDP 6967"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\GloballyOpenPorts\List
    • 8628:TCP = "8628:TCP:*:Enabled:TCP 8628"

Step 8

Search and delete these folders

[ Learn more ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %Application Data%\{Random Folder}
  • %Application Data%\Microsoft\Address Book

Step 9

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_ZBOT.ADXK. 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.

Step 10

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

Step 11

The following created registry key(s) cannot be identified by the user since there are no reference values in the created key. The only way it can be identified is by comparing the present keys with a backup of the system registry. Note that the said key(s) do not have to be deleted since it won't be harmful to the system:

  • HKEY_CURRENT_USER\Software\Microsoft\{Random Key}


Did this description help? Tell us how we did.
Analysis By: Ardin Christopher Maglalang

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