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TSPY_BANCOS.ZAC

October 08, 2012
 Analysis by: Michael Cabel
 PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type: Spyware

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This spyware may be dropped by other malware. It arrives as a component bundled with malware/grayware packages.

As of this writing, the said sites are inaccessible.

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:

5,104,641 bytes

File Type:

DLL

Memory Resident:

Yes

Initial Samples Received Date:

13 Aug 2010

Arrival Details

This spyware may be dropped by other malware.

It arrives as a component bundled with malware/grayware packages.

Installation

This spyware drops the following non-malicious files:

  • %Windows%\Netaps\version.txt
  • %Windows%\Netaps\windll.log

(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)

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
Spooler de Impressão = %System%\rundll32.exe %Windows%\netaps\windll.dll update

Other System Modifications

This spyware adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Serviço de Indexação Windows = %Windows%\netaps\sysinternals.exe

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Windows Update = %Windows%\netaps\winupdate.exe

Download Routine

As of this writing, the said sites are inaccessible.

Information Theft

This spyware monitors the Internet Explorer (IE) activities of the affected system, specifically the address bar or title bar. It recreates a legitimate website with a spoofed login page if a user visits banking sites with the following strings in the address bar or title bar:

  • Bradesco Internet Banking

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

  • Banco Bradesco

Stolen Information

This spyware sends the gathered information via HTTP POST to the following URL:

  • http://{BLOCKED}.{BLOCKED}.239.9

Other Details

This spyware connects to the following possibly malicious URL:

  • http://www.{BLOCKED}m.net/aspnet_client/FreeTextBox/Languages/in.txt

Variant Information

This spyware has the following MD5 hashes:

  • c64f34de486d51fa5bc6b9a0a1af16a5

It has the following SHA1 hashes:

  • 8839c42ec2030e25a9355e15d5fd57c3e8de0f2d

  SOLUTION

Minimum Scan Engine:

8.900

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

Restart in Safe Mode

[ Learn More ]

Step 3

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\Windows\CurrentVersion\Run
    • Spooler de Impressão = %System%\rundll32.exe %Windows%\netaps\windll.dll update
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • Serviço de Indexação Windows = %Windows%\netaps\sysinternals.exe
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • Windows Update = %Windows%\netaps\winupdate.exe

Step 4

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. %Windows%\Netaps\version.txt
%Windows%\Netaps\windll.log

Step 5

Scan your computer with your Trend Micro product to delete files detected as TSPY_BANCOS.ZAC. 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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