TSPY_ZBOT.MTF

This spyware may be downloaded from remote sites by other malware.

It is injected into all running processes to remain memory resident.

It modifies Internet Explorer security settings. This puts the affected computer at greater risk, as it allows malicious URLs to be accessed by the computer.

Arrival Details

This spyware may be downloaded from remote site(s) by the following malware:

• JS_REDIR.MTF

Installation

This spyware drops the following files:

• %Application Data%\{random folder 2}\{random file name 2}.{random extension name} - encrypted file containing stolen information
• %Application Data%\Microsoft\Address Book\winxp.wab
• %Application Data%\Microsoft\Address Book\winxp.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 drops the following non-malicious files:

• %User Temp%\{random number}.tmp\PsExec.exe

(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.)

It drops the following copies of itself into the affected system:

• %Application Data%\{random folder 1}\{random file name 1}.exe
• %User Temp%\{random number}.tmp\msupdate.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.. %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.)

It creates the following folders:

• %User Temp%\{random number}.tmp
• %Application Data%\{random folder 1}
• %Application Data%\{random folder 2}
• %Application Data%\Identities\{GUID}

(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.. %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 is injected into all running processes to remain memory resident.

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
{random CLSID} = "%Application Data%\{random folder 1}\{random file name 1}.exe"

Other System Modifications

This spyware adds the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
{random}

HKEY_CURRENT_USER\Software\Sysinternals\
PsExec

HKEY_CURRENT_USER\Software\Microsoft\
WAB

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Sysinternals\
PsExec
EulaAccepted = "1"

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

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\DomainProfile\AuthorizedApplications\
List
%windir%\explorer.exe = "%windir%\explorer.exe"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%windir%\explorer.exe = "%windir%\explorer.exe"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%User Temp%\{random number}.tmp\PsExec.exe = "%User Temp%\{random number}.tmp\PsExec.exe:*:Enabled:enable"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%User Temp%\{random number}.tmp\msupdate.exe = "%User Temp%\{random number}.tmp\msupdate.exe:*:Enabled:enable"

Web Browser Home Page and Search Page Modification

This spyware modifies Internet Explorer zone settings.

Download Routine

This spyware connects to the following website(s) to download and execute a malicious file:

• http://{BLOCKED}k.{BLOCKED}ps.org/WebTracking/Psupdate.exe

It saves the files it downloads using the following names:

• %User Temp%\tmp{random numbers}\Psupdate.exe - updated copy of itself

(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.)

Stolen Information

This spyware sends the gathered information via HTTP POST to the following URL:

• http://{BLOCKED}v.{BLOCKED}up.com/web/new1feeds.php
• http://{BLOCKED}s.{BLOCKED}up.com/web/new1feeds.php
• http://{BLOCKED}v.{BLOCKED}up.com/web/xmlfeed.php
• http://{BLOCKED}s.{BLOCKED}up.com/web/xmlfeed.php

NOTES:

It may also gather the following information from the affected system:

• Data on cookie files (URLs)
• Email-related information such as account names, email addresses, passwords, server data, and server port
• Email information stored in the user’s Windows Address Book (WAB) file