TSPY_BANKER.THQ

February 08, 2013
 ALIASES:

PWS-Banker!hh3 (McAfee); Trojan-Downloader.Win32.Delf.belc (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Spyware

  • Destructiveness: No

  • Encrypted:

  • 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:

648,192 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

08 Feb 2013

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.

Installation

This spyware creates the following folders:

  • %Program Files%\2V3H5Y

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
BRIAN-03A68ED.bkp = "%Program Files%\2V3H5Y\7Y5C8N.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
BRIAN-03A68ED.up = "%Program Files%\2V3H5Y\5W2q2p.exe"

Other System Modifications

This spyware adds the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
YT1A55

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
YT1A55
BRIAN-03A68ED = "%Program Files%\2V3H5Y\7Y5C8N.exe"

It deletes the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\UnreadMail\
rsa@account.com

Dropping Routine

This spyware drops the following files:

  • %Program Files%\2V3H5Y\6f2Q5M0D1o.4u1A4Y1j
  • %Program Files%\2V3H5Y\coWindow.exe
  • %Program Files%\2V3H5Y\atiView.exe
  • %Program Files%\2V3H5Y\LitWinHost.exe

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)

Other Details

This spyware connects to the following possibly malicious URL:

  • http://{BLOCKED}e.tt/api/1/files/56yjB6V/0/blob?download

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.300

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Restart in Safe Mode

[ Learn More ]

Step 3

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.

  • In HKEY_CURRENT_USER\Software\Microsoft
    • YT1A55

Step 4

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\Run
    • BRIAN-03A68ED.bkp = "%Program Files%\2V3H5Y\7Y5C8N.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • BRIAN-03A68ED.up = "%Program Files%\2V3H5Y\5W2q2p.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\YT1A55
    • BRIAN-03A68ED = "%Program Files%\2V3H5Y\7Y5C8N.exe"

Step 5

Search and delete these components

[ Learn More ]
There may be some components 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.
  • %Program Files%\2V3H5Y\6f2Q5M0D1o.4u1A4Y1j
  • %Program Files%\2V3H5Y\coWindow.exe
  • %Program Files%\2V3H5Y\atiView.exe
  • %Program Files%\2V3H5Y\LitWinHost.exe

Step 6

Search and delete this folder

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %Program Files%\2V3H5Y

Step 7

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

Step 8

Restore these deleted registry keys/values from backup

*Note: Only Microsoft-related keys/values will be restored. If the malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.

  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\UnreadMail
    • rsa@account.com


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