Analysis by: kathleenno
 Modified by: Cris Nowell Pantanilla
ALIASES:

Infostealer.Bancos (Symantec); Trojan-Banker.Win32.Banbra.ajhm (Kaspersky); W32/Banbra.AJHM!tr (Fortinet)

 PLATFORM:

Windows 2000, Windows XP, Windows 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 arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

  TECHNICAL DETAILS

File Size: 724,992 bytes
File Type: DLL
Memory Resident: Yes
Initial Samples Received Date: 03 Aug 2011
Payload: Connects to URLs/IPs, Modifies system registry, Downloads files, Steals information

Arrival Details

This spyware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Autostart Technique

This spyware adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CLASSES_ROOT\CLSID\{DAF10ED1-3469-4EBD-931E-A1CE7D7E75D4}\
InprocServer32
(default) = {malware path and filename}

Other System Modifications

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

HKEY_CLASSES_ROOT\Win7.clsWin7

HKEY_CLASSES_ROOT\CLSID\{DAF10ED1-3469-4EBD-931E-A1CE7D7E75D4}

HKEY_CLASSES_ROOT\Interface\{A14701C9-9974-4E7F-867B-9275DF300C33}

HKEY_CLASSES_ROOT\TypeLib\{34A37F8A-9676-4293-BF9A-B416D0A75FB9}

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:

  • https://login.live.com/ppsecure
  • http://www.hotmail.com
  • https://login.live.com/ppsecure/post.srf
  • https://aapj.bb.com.br/aapj/includes/js/validatorApj.js
  • https://aapj.bb.com.br/aapj/loginpfe.bb
  • https://www.google.com/accounts/ServiceLoginAuth
  • https://www2.bancobrasil.com.br/aapf/login.jsp

NOTES:
It creates the following registries where it saves the stolen information:

  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion
    login = "{stolen email address}"

  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion
    senha = "{stolen password}"

It then send passwords for the said sites to the following URL via HTTP post:
  • http://{BLOCKED}nerditerr.{BLOCKED}1.f1.k8.com.br/teste.php
  • http://{BLOCKED}nerditerr.{BLOCKED}1.f1.k8.com.br/teste2.php
  • http://{BLOCKED}nerditerr.{BLOCKED}1.f1.k8.com.br/teste3.php
It attempts to connect to the following URLs to download a file:
  • {random}.{BLOCKED}e.in/zpit.txt
Where {random} may be any of the following:
  • nuvens0103
  • kalmax0406
  • linuxy0709
  • pitak1012
  • mikey1315
  • dogmax1618
  • petrox1921
  • asbnew2224
  • orantax2527
  • kabix2831

As of this writing, however, the said sites are inaccessible.

Once the users log-in to an account, this malware can interact with the internet bank and transfer the money to a pre-configured account.

  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

Scan your computer with your Trend Micro product and note files detected as TSPY_BANKER.PHT

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Delete this registry key

[ 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. Before you could do this, you must restart in Safe Mode. For instructions on how to do this, you may refer to this page If the preceding step requires you to restart in safe mode, you may proceed to edit the system registry.

 
  • In HKEY_CLASSES_ROOT
    • Win7.clsWin7
  • In HKEY_CLASSES_ROOT\CLSID
    • {DAF10ED1-3469-4EBD-931E-A1CE7D7E75D4}
  • In HKEY_CLASSES_ROOT\Interface
    • {A14701C9-9974-4E7F-867B-9275DF300C33}
  • In HKEY_CLASSES_ROOT\TypeLib
    • {34A37F8A-9676-4293-BF9A-B416D0A75FB9}

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_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion
    • login = "{stolen email address}"
  • In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion
    • senha = "{stolen password}"

Step 6

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_BANKER.PHT. 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.

NOTES:

Malware Automates Hacking


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