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TrojanSpy.Win32.BANKER.AK

October 16, 2018
 Analysis by: Augusto II Remillano
 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Trojan Spy

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware, Downloaded from the Internet


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

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:

311584256 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

09 Oct 2018

Arrival Details

This Trojan Spy 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 Trojan Spy drops the following files:

  • %System Root%\execute.bat - renames a file/folder located in %Program Files% named "Trusteer" to "Trusterc". Also deletes SMP.ON.
  • {Malware File path}\{Malware Filename}.UP -> contains information gathered

(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), 7 (32-bit), and 8 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), 7 (64-bit), and 8 (64-bit).)

Autostart Technique

This Trojan Spy drops the following file(s) in the Windows User Startup folder to enable its automatic execution at every system startup:

  • %User Startup%\{malware filename}.lnk

(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows XP, or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, and 8.)

Information Theft

This Trojan Spy attempts to steal information from the following banks and/or other financial institutions:

  • Banco do Brasil
  • Banco do Nordeste
  • Banco Bradesco
  • Caixa Econômica Federal
  • Citibank
  • Banco Daycoval
  • Itaú Unibanco
  • Banco Santander
  • Banco Sicredi
  • Banco Sicoob
  • Banestes Banco Estado
  • Banco Mercantil Do Brasil
  • Banco Rendimento
  • Xapo
  • Poloniex
  • BitcoinTrade
  • Mercado Bitcoin
  • FOXBIT
  • TUDO SOBRE BITCOIN

Other Details

This Trojan Spy does not proceed to its malicious routine if it detects that it is being debugged.

It adds the following scheduled tasks:

  • ENERGON
    • Executes at system startup
    • Executes the following file:
      • %System Root%\execute.bat

(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

14.560.04

FIRST VSAPI PATTERN DATE:

12 Oct 2018

VSAPI OPR PATTERN File:

14.561.00

VSAPI OPR PATTERN Date:

13 Oct 2018

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

Identify and terminate files detected as TrojanSpy.Win32.BANKER.AK

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 4

Search and delete this file

[ 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.  
  • %System Root%\execute.bat
  • %User Startup%\{malware filename}.lnk
  • {Malware File path}\{Malware Filename}.UP

Step 5

Scan your computer with your Trend Micro product to delete files detected as TrojanSpy.Win32.BANKER.AK. 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 the following Trend Micro Support pages for more information:


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