TSPY_ZBOT.CAX

This Trojan 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 Trojan may be downloaded from the following remote site(s):

• http://www.waldbauverein.de/gbook/ldr3no.exe

Installation

This Trojan adds the following folders:

• %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.)

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

• %System%\sdra64.exe

(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.)

It adds the following mutexes to ensure that only one of its copies runs at any one time:

• _AVIRA_2109

It injects itself into the following processes as part of its memory residency routine:

• SVCHOST.EXE
• WINLOGON.EXE

Autostart Technique

This Trojan modifies the following registry entries to ensure it 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,.)

Other System Modifications

This Trojan adds the following registry entries:

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

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
EnableFirewall = 0

Dropping Routine

This Trojan 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.)

Information Theft

This Trojan 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://bigpayinfos.com/1001ns/cfg3n.bin

It attempts to access a website to download a file which contains information where the Trojan can download an updated copy of itself, and where to send its stolen data. This configuration file also contains the following list of targeted bank-related websites from which it steals information:

• https://onlineeast#.bankofamerica.com/cgi-bin/ias/*/GotoWelcome

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

• Bank of America

Stolen Information

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

• hhtp://bestviewbars.com/ipchekers/stat1.php

Variant Information

This Trojan has the following MD5 hashes:

• f059768b62bb70d218f31984a7f1f972

It has the following SHA1 hashes:

• 181ab701a10ca6f03eea298b657e1d4a8faef7e8