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BZub.BL


Discovered:
Aliases:


August 22, 2006
BZub.BL
BZub.BL

Malware
Trojan-Spy
W32

Summary

BZub.BL is a member of the BZub family of trojan spies.These types of trojans compromise system security by providing authentication information (logon, passwords, credit card numbers, etc.) to malicious users. This trojan steals the logon information of some Online German Bank accounts. Aside from that, it also steals e-mail accounts and passwords that are stored in the user's computer system.BZub.BL is downloaded and executed by Small.DOG.



Disinfection & Removal

Automatic Disinfection

Allow F-Secure Anti-Virus to disinfect the relevant files.

For more general information on disinfection, please see Removal Instructions.



Technical Details

BZub.BL is downloaded and executed by Small.DOG from the following URL:

  • http://apte-hamburg.de/Deutsch/Aktuell/[REMOVED].exe

Once BZub.BL is executed, it drops a file named Ipv6mons.dll into the Windows Systems Directory. It adds several encrypted or random registry values under the following subkey as its auto start technique:

  • [SOFTWARE\Microsoft\Windows\CurrentVersion\Control Panel\load]

The registry values are the following:

  • cmpid
  • forwas
  • h
  • net_insll
  • nw
  • worg
  • wspopp

Moreover, it registers itself as a Browser Helper Object (BHO) using the following registry entries:

  • [HKEY_CLASSES_ROOT\CLSID\\InprocServer32] @ = "{systemdir}\ipv6mons.dll"
  • [HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\\InprocServer32] @ = "{systemdir}\ipv6mons.dll"

It also registers its Internet Explorer as an authorized application to prevent the Windows Firewall from blocking network transactions through the said program:

  • [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess \Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] "{Program Files}\Internet Explorer\IEXPLORE.EXE" = "{Program Files} \Internet Explorer\IEXPLORE.EXE:*:Enabled:Internet Explorer"

BZub.BL also makes a copy of the existing file C:\lofg.xxx to C:\ewerufeassur8fr. It deletes the following files:

  • C:\clearsdingdrfive
  • C:\test.txt

It creates a file named info.txt containing information about the infected system:

  • Computer ID
  • Computer name
  • Country/Region
  • IP Address
  • Windows version

BZub.BL steals information about the following by monitoring websites/forms and querying some registries:

  • Bank logon details
  • Cache password
  • Hotmail smtp/pop3 server
  • IEAutoCompleteFields
  • MSN Explorer Signup
  • Outlook Express

It steals the logon details of bank account users that have the following strings:

  • app/ueberweisung.input.do
  • app/ueberweisung.prep.do
  • banking.postbank.de
  • banking.postbank.de/app/finanzstatus.reduziert.init.do
  • banking.postbank.de/app/kontoumsatz.umsatz.init.do
  • banking.postbank.de/app/legitimation.input.do
  • banking.postbank.de/app/ueberweisung.quittung.do
  • e-gold.com/acct/acct.asp
  • https://*.netbank.commbank.com.au/netbank/bankmain
  • https://banking.postbank.de/app/finanzstatus.init.do
  • https://banking.postbank.de/app/kontoumsatz.umsatz.init.do
  • https://banking.postbank.de/app/welcome.do
  • https://signin.ebay*/ws/eBayISAPI.dll
  • postbank.de

BZub.BL sends gathered information via FTP using any of the following files:

  • form.txt
  • info.txt
  • shot.txt


Detection



Detection Type: PC
Database: 2006-08-21_02





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