TSPY_ZBOT.MK

This spyware may be dropped by other malware. It may be unknowingly downloaded by a user while visiting malicious websites.

It attempts to steal sensitive online banking information, such as user names and passwords. This routine risks the exposure of the user's account information, which may then lead to the unauthorized use of the stolen data. It attempts to steal information, such as user names and passwords, used when logging into certain banking or finance-related websites.

Arrival Details

This spyware may be dropped by other malware.

It may be unknowingly downloaded by a user while visiting malicious websites.

Installation

This spyware drops copies of itself in the Windows system folder and appends garbage code to the dropped copy to avoid easy detection. The dropped copies uses the following file names:

• sdra64.exe

It injects itself into the following processes running in the affected system's memory:

• SVCHOST.EXE
• WINLOGON.EXE

It creates the following folders with attributes set to System and Hidden to prevent users from discovering and removing its components:

• %System%\lowsec

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

Autostart Technique

This spyware modifies the following registry entry(ies) to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Userinit = %System%\userinit.exe, %System%\sdra64.exe,

(Note: The default value data of the said registry entry is %System%\userinit.exe,.)

It drops the following files:

• %System%\lowsec\local.ds - copy of the encrypted downloaded file
• %System%\lowsec\user.ds - used to save the gathered information

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

Other System Modifications

This spyware adds the following registry entries as part of its installation routine:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Network
UID = {Computer name}_{Random numbers}

It adds the following registry keys as part of its installation routine:

HKEY_USERS\.DEFAULT\Software\
Microsoft\Windows\CurrentVersion\
Explorer\{43BF8CD1-C5D5-2230-7BB2-98F22C2B7DC6}

HKEY_USERS\.DEFAULT\Software\
Microsoft\Windows\CurrentVersion\
Explorer\{9E538ED2-437C-088A-86DD-1FE4F7C3145B}

Information Theft

This spyware monitors the Internet Explorer (IE) activities of the affected system, specifically the address bar or title bar. It recreates a legitimate website with a spoofed login page if a user visits banking sites with the following strings in the address bar or title bar:

• http://*myspace.com*
• https://www.gruposantander.es/*
• https://internetbanking.gad.de/*/portal?bankid=*
• https://www.vr-networld-ebanking.de/index.php?RZKZ=*&RZBK=*
• https://finanzportal.fiducia.de/*?rzid=*&rzbk=*
• https://ssl.bsk.com.pl/bskonl/login.ac
• https://*.banking.first-direct.com/*

It attempts to steal sensitive online banking information, such as user names and passwords. This routine risks the exposure of the user's account information, which may then lead to the unauthorized use of the stolen data.

It accesses the following site to download its configuration file:

• http://{BLOCKED}y.com.cn/catalog/images/default/3.bin

The downloaded file contains information where the malware can download an updated copy of itself, and where to send its stolen data.

It attempts to steal information from the following banks and/or other financial institutions:

• Santader
• Volksbank
• Fiducia
• ING Bank
• First Direct

Stolen Information

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

• http://www.{BLOCKED}tek.cn/catalog/images/logos/g.php