TSPY_BANKER.YWNFQ

May 12, 2015
 ALIASES:

HEUR:Trojan.Win32.Generic (Kaspersky); Trojan horse SHeur4.CIZZ (AVG)

 PLATFORM:

Windows

 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:

9,104,384 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

12 May 2015

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 drops the following copies of itself into the affected system:

  • %Program Files%\Windows Media Player\spoolsv.exe

(Note: %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.)

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
Spooler SubSystem App = "%Program Files%\Windows Media Player\spoolsv.exe"

Other System Modifications

This spyware deletes the following files:

  • %User Profile%\VLCMediaPlayer\VLCMediaPlayer.exe
  • %Program Files%\Windows Media Player\WMPSideShowGadgets.exe
  • %Program Files%\Windows Media Player\wmpshares.exe
  • %Program Files%\Windows Media Player\spoolsv.exe

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.)

It adds the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Servies\SharedAccess\Parameters\
FirewallPolicyStandardProfile\AuthorizedApplications\List

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Servies\SharedAccess\Parameters\
FirewallPolicyStandardProfile\AuthorizedApplications\List
{malware path and file name} = "{random characters}"

Other Details

This spyware connects to the following possibly malicious URL:

  • {BLOCKED}.164.91

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.750

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_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Servies\SharedAccess\Parameters\FirewallPolicyStandardProfile\AuthorizedApplications
    • List

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
    • Spooler SubSystem App = "%Program Files%\Windows Media Player\spoolsv.exe"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Servies\SharedAccess\Parameters\FirewallPolicyStandardProfile\AuthorizedApplications\List
    • {malware path and file name} = "{random characters}"

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_BANKER.YWNFQ. 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 6

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • %User Profile%\VLCMediaPlayer\VLCMediaPlayer.exe
  • %Program Files%\Windows Media Player\WMPSideShowGadgets.exe
  • %Program Files%\Windows Media Player\wmpshares.exe
  • %Program Files%\Windows Media Player\spoolsv.exe


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