TSPY_ZBOT.AADN

This spyware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

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

It does not have any propagation routine.

It does not have any backdoor routine.

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.

It retrieves specific information from the affected system.

It deletes the initially executed copy of itself.

Arrival Details

This spyware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This spyware drops the following files:

• %Application Data%\{random folder name2}\{random file name2}.{random extension}
• %Application Data%\Microsoft\Address Book\{username}.wab
• %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 drops the following copies of itself into the affected system:

• %User Temp%\file.exe
• %Application Data%\{random folder name1}\{random file name1}.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.. %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%\Microsoft\Address Book
• %Application Data%\{random folder name1}
• %Application Data%\{random folder name2}

(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 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} = "%Application Data%\{random folder name1}\{random file name1}.exe"

Other System Modifications

This spyware adds the following registry keys:

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\
{random key}

It adds the following registry entries:

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

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

HKEY_CURRENT_USER\Software\Microsoft\
WAB\WAB4\Wab File Name
{Default} = "%Application Data%\Microsoft\Address Book\winxp.wab"

HKEY_CURRENT_USER\Software\Microsoft\
{random key}
{random} = "{random values}"

HKEY_CURRENT_USER\Software\Microsoft\
WAB\WAB4
FirstRun = "1"

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

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%Windows%\explorer.exe = "%Windows%\explorer.exe:*:Enabled:Windows Explorer"

Propagation

This spyware does not have any propagation routine.

Backdoor Routine

This spyware does not have any backdoor routine.

Web Browser Home Page and Search Page Modification

This spyware modifies Internet Explorer zone settings.

Download Routine

This spyware connects to the following URL(s) to download its configuration file:

• http://{BLOCKED}ols.no-ip.biz/ndukwe/on/gate.php

Information Theft

This spyware retrieves the following information from the affected system:

• Host name
• Task list
• Ip Configuration

It attempts to get stored information such as user names, passwords, and hostnames from the following browsers:

• Chrome
• Firefox
• Internet Explorer

Other Details

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

• www.google.com/webhp

It deletes the initially executed copy of itself

NOTES:

It queries the registry below to check for installed anti-virus products and other security related software:

• *ROOT\SECURITYCENTER
• *ROOT\SECURITYCENTER

If it is found the following antivirus products and other security related softwares, it terminates the program:

• avast!
• AVG
• Anti-Virus
• AntiVir
• Antivirus
• Client
• Desktop
• ESET
• Inspection
• Kaspersky
• Malware
• McAfee
• Microsoft
• Monitor
• Norton
• Protection
• SafenSoft
• Security
• Security Center
• SecurityCenter
• Service
• Symantec
• SysWatch

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 does not have rootkit capabilities.

It does not exploit any vulnerability.