TSPY_ZBOT.CAV

This spyware 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. Once users access any of the monitored sites, it starts logging keystrokes.

It attempts to get information from a list of banks or financial institutions.

It checks for the presence of the following processes which are related to Outpost Personal Firewall and ZoneLabs Firewall Client:

• outpost.exe
• zlclient.exe

It terminates if either of the said processes exist. This is to ensure that it runs uninterrupted. It also has rootkit capabilities, which enables it to hide its processes and files from the user.

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 then creates the following non-malicious file(s):

• %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\System32.)

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\System32.)

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

• _AVIRA_2108
• _AVIRA_2109

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

• SVCHOST.EXE
• WINLOGON.EXE

Autostart Technique

This spyware adds the following registry entries 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,.)

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}

Information Theft

This spyware 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.

Once users access any of the monitored sites, it starts logging keystrokes.

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

Note that the contents of the file, hence the list of websites to monitor, may change any time.

Attacked Entities

This spyware attempts to get information from a list of banks or financial institutions.

Stolen Information

This spyware saves the stolen information in the following file:

• %System%\lowsec\user.ds

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

Other Details

This spyware checks for the presence of the following processes which are related to Outpost Personal Firewall and ZoneLabs Firewall Client:

• outpost.exe
• zlclient.exe

It terminates if either of the said processes exist. This is to ensure that it runs uninterrupted. It also has rootkit capabilities, which enables it to hide its processes and files from the user.

It did not exhibit backdoor routines during testing.

Variant Information

This spyware has the following MD5 hashes:

• bb91c41acba61f2d3006437c54e6db10

It has the following SHA1 hashes:

• 1a9212d1751fca0d2dab9a499c4b98e6221a42d5