Threat Encyclopedia

TSPY_ZBOT.BYZ

Publish date: October 15, 2010

ANALYSIS BY

Karl Dominguez


PLATFORM:

Windows 2000, XP, Server 2003

OVERALL RISK RATING:
REPORTED INFECTION:
SYSTEM IMPACT RATING:
INFORMATION EXPOSURE:

  • Threat Type:Spyware

  • Destructiveness:No

  • Encrypted: Yes

  • In the wild: Yes

OVERVIEW


Trend Micro has flagged this malware as noteworthy due to the increased potential for damage, propagation, or both, that it possesses. Specifically, this Zeus malware drops an infector file in the affected system (not an ordinary Zeus malware behavior).

To get a one-glance comprehensive view of the behavior of this Spyware, refer to the Threat Diagram shown below.

This spyware may be downloaded by other malware/grayware from remote sites. It may be dropped by other malware. It may be unknowingly downloaded by a user while visiting malicious websites.

It creates folders where it drops its files. It may be injected into processes running in memory.

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.

TECHNICAL DETAILS

File Size:

178,948 bytes

File Type:

PE

Memory Resident:

Yes

Initial Samples Received Date:

27 Sep 2010

Arrival Details

This spyware may be downloaded by the following malware/grayware from remote sites:

It may be dropped by other malware.

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

It may be downloaded from the following remote sites:

  • http://{BLOCKED}kmzjwjtyzqj.org/news/?s=3

Installation

This spyware drops the following files:

  • %Application Data%\{random1}\{random}.exe - copy of itself
  • %Application Data%\{random2}\{random}.{3 random alpha character extension name} - encrypted file

(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 is injected into the following processes running in memory:

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

It may be injected into processes running in memory.

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
{GUID} = {malware path and file name}

Other System Modifications

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

HKEY_CURRENT_USER
CleanCookies = 0

HKEY_LOCAL_MACHINE
%Windows%\\\\EXPLORER.EXE = %Windows%\\EXPLORER.EXE:*:Enabled:Windows Explorer

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.

It accesses the following site to download its configuration file:

  • {BLOCKED}mzjwjtyzqj.org/news/?s=2

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:

  • !*.facebook.com/*
  • !*.microsoft.com/*
  • !*.myspace.com/*
  • !*.twitter.com/*
  • !*.youtube.com/*
  • !https://*.mcafee.com/*
  • !https://chatserver.comm100.com/*
  • !https://clients4.google.com/*
  • !https://fx.sbisec.co.jp/*
  • !https://mail.goole.com/*
  • !https://match2.me.dium.com/*
  • !https://server.iad.liveperson.net/*
  • !https://www.direktprint.de/ *
  • *.barclays.co.uk*
  • *.barclays.co.uk*barcaz.php*
  • *.barclays.co.uk*bg.php*
  • *.firstdirect.com/1/2/*
  • *.hsbc.co.uk/1/2*
  • *.mybank.alliance-leicester.co.uk*
  • *alliance*leicester.co.uk*bg.php*
  • *alliance*leicester.co.uk*leicesteraz.php*
  • *firstdirect.com*bg.php*
  • *firstdirect.com*firstaz.php*
  • *hsbc.co.uk*az.php*
  • *hsbc.co.uk*bg.php*
  • http://www.barclays.co.uk.servaz.cc/barc/bg.php
  • http://www.barclays.co.uk.servaz.cc/js/barcaz.js
  • http://www.mybank.alliance-leicester.cc/js/leicesteraz.js
  • http://www.mybank.alliance-leicester.cc/leicester/bg.php
  • http://www.nsbc.cc/az.js
  • http://www.nsbc.cc/hsbc/bg.php
  • http://www1.banking.firstdirect.cc/first/bg.php
  • http://www1.banking.firstdirect.cc/js/firstaz.js
  • https://*.ebanking-services.com/*/signin.aspxauthTknW

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.

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

  • Comm100 Live Chat
  • Direkt Print
  • Facebook
  • Google Mail
  • LivePerson
  • McAfee
  • Me.dium
  • Microsoft
  • Myspace
  • Sbisec
  • Twitter
  • YouTube
  • ANZ
  • Barclays
  • NSBC
  • HSBC
  • First Direct

Drop Points

Stolen information is uploaded to the following websites:

  • {BLOCKED}mzjwjtyzqj.org/news/?s=

Other Details

This spyware does the following:

  • It decrypts and executes another malicious file in memory. As a result the following file(s) is created:
    • %User Startup%\{4-Random Characters}.exe - detected as PE_LICAT.A-O

(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.)

Variant Information

This spyware has the following MD5 hashes:

  • f75a4692b5185286ac0b2ff02da0c32b

It has the following SHA1 hashes:

  • 017394d012a6412b42a3846e1c32f420cc146712

SOLUTION

Minimum Scan Engine:

8.900

VSAPI PATTERN File:

7.492.10

VSAPI PATTERN Date:

27 Sep 2010

VSAPI PATTERN Date:

9/27/2010 12:00:00 AM

VSAPI OPR PATTERN File:

7.551.00

VSAPI OPR PATTERN Date:

18 Oct 2010

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Remove malware files dropped/downloaded by TSPY_ZBOT.BYZ

Step 3

Scan your computer with your Trend Micro product and note files detected as TSPY_ZBOT.BYZ

Step 4

Restart in Safe Mode

[ Learn More ]

Step 5

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.


  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Privacy
    • CleanCookies = 0
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • {GUID} = {malware path and file name}
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
    • %Windows%\EXPLORER.EXE = %Windows%\EXPLORER.EXE:*:Enabled:Windows Explorer

Step 6

Search and delete these files

[ Learn More ]
There may be some component files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %Application Data%\{random1}\{random}.exe 
  • %Application Data%\{random2}\{random}.{random} 
  • Step 7

    Scan your computer with your Trend Micro product to delete files detected as TSPY_ZBOT.BYZ. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.


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