Bank of America CashPro customers targeted by Tepfer variant (Feb 25, 2013)

The Dell SonicWALL UTM Research team received reports of a new variant of the Tepfer Trojan. The Trojan originates through an email purporting to be from Bank of America CashPro Online. It asks the user to replace their digital certificate with one provided in the malicious attachment. The Trojan also downloads and executes various other malwares such as Zeus during the infection process. Another variant of this malware has been covered recently in a previous sonicalert

Infection Cycle:

The email has an attachment with a zip file containing the Trojan executable:

The executable file in the attachment uses the following icon:

The Trojan performs the following DNS queries:

blog.ritual.ca
ftp.tecnoazar.com.ar
preservationsolutionsplus.com
omarpage.com
www.google.com
ceregypt.com
cuatrofm.es
two.really-good-books.com
three.shell4pets.com
dontgetcaught.ca

The Trojan adds the following files to the filesystem:

%USERPROFILE%qyzozcewagje.exe
%APPDATA%Aqripazyykej.exe
%APPDATA%Aqripa9trZaHw9.exe
%APPDATA%AqripaaL5DZn.exe
%APPDATA%Aqripa4PsxF.exe (empty file)
%TEMP%tmp0c9b3e815365.exe (empty file)
%TEMP%tmpa6dcb566load50.exe
%TEMP%tmpd5e04e47a3.exe

The Trojan adds the following keys to the Windows registry:

HKEY_CURRENT_USERSoftwareMicrosoftFuith 2a33b827 "bAkSC4m6SY/fyYlkHb0="
HKEY_CURRENT_USERSoftwareMicrosoftFuith 25bd6f75 "Xwl9Cw=="
HKEY_CURRENT_USERSoftwareMicrosoftFuith 6e9ddg5 "1l99C9j3KI+5ybtk"
HKEY_CURRENT_USERSoftwareMicrosoftFuith 1h1ci1jg hex:0e,09,7d,0b,3f,df,0d,de,7f,7d,93,dc,19,eb,4f, ...
HKEY_CURRENT_USERSoftwareMicrosoftFuith 2c6dd9ac "Dgl9C++6KI+
HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionRun {C05E9BBE-21ED-AD41-CB90-673CEB12442E} "%APPDATA%Aqripazyykej.exe"
HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionRun qyzozcewagje "%USERPROFILE%qyzozcewagje.exe"

The Trojan injects code into the currently running instance of explorer.exe and exits:

The injected code causes explorer to download and run the following malicious executable files:

The Trojan was observed sending the following encrypted information to a remote webserver:

The code that is injected into explorer.exe contains the following data referencing various banking URL's:

!https://*.lphbs.com/*

@https://*.onlineaccess*AccountOverview.aspx

@https://www.mercantilcbonline.com/secure/banking/protected/gridcard/*

@https://bancopostaimpresaonline.poste.it/bpiol/lastFortyMovementsBalance.do?method=loadLastFortyMovementList

@https://www3.csebo.it/*

@https://qweb.quercia.com/*

@https://www.sparkasse.it/*

@https://dbonline.deutsche-bank.it/*

@https://*.cedacri.it/*

@https://www.bancagenerali.it/*

@https://www.csebo.it/*

@https://*.deutsche-bank.it/*

@https://hbclassic.bpergroup.net/*/login

@https://nowbankingpiccoleimprese*

@https://www.inbiz.intesasanpaolo.com/*

SonicWALL Gateway AntiVirus provides protection against this threat via the following signatures:

GAV: Tepfer.EB_2 (Trojan)
GAV: Pushdo.PKQ (Trojan)
GAV: Sality.AM.gen (Virus)
GAV: Kryptik.AUWV_2 (Trojan)
GAV: ZBot.EB_4 (Trojan)

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The SonicWall Capture Labs Threat Research Team gathers, analyzes and vets cross-vector threat information from the SonicWall Capture Threat network, consisting of global devices and resources, including more than 1 million security sensors in nearly 200 countries and territories. The research team identifies, analyzes, and mitigates critical vulnerabilities and malware daily through in-depth research, which drives protection for all SonicWall customers. In addition to safeguarding networks globally, the research team supports the larger threat intelligence community by releasing weekly deep technical analyses of the most critical threats to small businesses, providing critical knowledge that defenders need to protect their networks.