TROJ_ZBOT.WCZ

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://{BLOCKED}fan.net/chan/aol.exe

Installation

This Trojan adds the following folders:

• %Application Data%\{random1}
• %Application Data%\{random2}

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.)

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

• ctfmon.exe
• explorer.exe
• rdpclip.exe
• taskeng.exe
• taskhost.exe
• wscntfy.exe

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{E4B35C10-A034-EB30-2472-4E97860F1DB9} = %Application Data%\{random1}\{random}.exe

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
{random}

Dropping Routine

This Trojan drops the following files:

• %Application Data%\{random1}\{random}.exe
• %Application Data%\{random2}\{random}.{random}

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, 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://{BLOCKED}fan.net/chan/cfg.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:

• *.microsoft.com/*
• myspace
• odnoklassniki

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

• Microsoft
• Myspace
• Odnoklassniki

Stolen Information

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

• http://{BLOCKED}fan.net/chan/bril/server.php

Variant Information

This Trojan has the following MD5 hashes:

• baaa78417356585e3b0a157fdc3d09c9

It has the following SHA1 hashes:

• 319465e96922a05456b969d01d9d0b781c592d89