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TSPY_BANKER.YWNRI

November 15, 2016
 Analysis by: John Kevin Sanchez
 ALIASES:

TrojanSpy:Win32/Banker (Microsoft), W32/Banker.ACED!tr.spy (Fortinet), TR/Spy.Banker.600576.3 (Avira)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 REPORTED INFECTION:

  • Threat Type: Spyware

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware, Downloaded from the Internet


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.

As of this writing, the said sites are inaccessible.

It gathers certain information on the affected computer.

It connects to certain websites to send and receive information.

  TECHNICAL DETAILS

File Size:

600,576 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

11 Nov 2016

Payload:

Steals information, Downloads files, Connects to URLs/IPs

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 files:

  • %Application Data%\{DD-MM-YYYY}\{random filename}.bat

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Download Routine

This spyware connects to the following URL(s) to download its component file(s):

  • http://wwr.{BLOCKED}iume.info/terca19/hwrcomp.html
  • http://wwr.{BLOCKED}iume.info/terca19/Hkcmds.html

It saves the files it downloads using the following names:

  • %Application Data%\{DD-MM-YYYY}\hwrcomp.sys
  • %Application Data%\{DD-MM-YYYY}\Hkcmds.exe

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

As of this writing, the said sites are inaccessible.

Information Theft

This spyware gathers the following information on the affected computer:

  • Computer Name
  • Installed GBPlugins
  • Installed Antivirus
  • Get UUID
  • Malware Version

Other Details

This spyware connects to the following website to send and receive information:

  • http://www.{BLOCKED}ra.info/Contador12/write/?query={encrypted gathered data}

It does the following:

  • It checks for the presence of the following files and folders which are related to banking programs:
    • %Program Files%\Scpad
    • %Program Files%\GbPlugin
    • %Program Files%\GbPlugin\gbiehtec.dll
    • %Program Files%\GbPlugin\gbiehbmb.dll
    • %Program Files%\GbPlugin\gbiehamz.dll
    • %Program Files%\GbPlugin\gbiehbnt.dll
    • %Program Files%\GbPlugin\gbiehbnb.dll
    • %Program Files%\GbPlugin\gbiehisg.dll
    • %Program Files%\GbPlugin\gbiehscd.dll
    • %Program Files%\GbPlugin\gbiehuni.dll
    • %Program Files%\GbPlugin\gbiehcef.dll
    • %Program Files%\GbPlugin\gbiehabn.dll
    • %Program Files%\GbPlugin\gbieh.dll
  • After checking the installed banking program, it identifies which of the following banks the user uses:
    • Banco do Brasil
    • Banco Santander
    • CEF
    • Itau
    • Sicredi
    • Infoseg
    • Banco do Nordeste
    • Banestes
    • Banco da Amazonia
    • Mercantil Banco
    • UniCredit
    • Banco Bradesco

(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.)

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

12.892.03

FIRST VSAPI PATTERN DATE:

11 Nov 2016

VSAPI OPR PATTERN File:

12.893.00

VSAPI OPR PATTERN Date:

12 Nov 2016

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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Search and delete these files

[ Learn More ]
There may be some 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.  
  • %Application Data%\{DD-MM-YYYY}\{random filename}.bat
  • %Application Data%\{DD-MM-YYYY}\hwrcomp.sys
  • %Application Data%\{DD-MM-YYYY}\Hkcmds.exe

Step 4

Scan your computer with your Trend Micro product to delete files detected as TSPY_BANKER.YWNRI. 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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