TrojanSpy.Win32.NUMANDO.MSIDLDT

 Analysis by: Clive Fuentebella

 ALIASES:

W32/Banbra.L (FORTINET); Win32/Spy.Numando.L (NOD32)

 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:

Downloaded from the Internet, Dropped by other malware

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 executes then deletes itself afterward.

It retrieves specific information from the affected system.

  TECHNICAL DETAILS

File Size:

17,086,976 bytes

File Type:

DLL

Memory Resident:

Yes

Initial Samples Received Date:

14 Apr 2020

Payload:

Connects to URLs/IPs, Collects system information

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:

  • {Malware file path}\music.mp3
  • {Malware file path}\{Computer name}.pdf (contains the malware's latest path)

It drops the following copies of itself into the affected system:

  • {Malware file path}\{Random 8 characters from A-Z}.exe

It adds the following processes:

  • "{Default browser file path}" https://{BLOCKED}o.bo/2ULIS4F

It executes then deletes itself afterward.

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{Malware name}.exe = {Malware file path and name}.exe

It drops the following files:

  • %User Startup%\{Random 8 characters from A-Z}.vbs

(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 2003(32-bit), XP and 2000(32-bit), or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit), 10(64-bit).)

Other System Modifications

This Trojan Spy modifies the following file(s):

  • %AppDataLocal%\Google\Chrome\User Data\Local State
  • %Application Data%\Mozilla\Firefox\Profiles\{Default profile}\prefs.js

(Note: %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It deletes the following files:

  • {Malware file path}\{Computer name}.pdf

Process Termination

This Trojan Spy terminates the following processes if found running in the affected system's memory:

  • chrome.exe
  • firefox.exe

Information Theft

This Trojan Spy retrieves the following information from the affected system:

  • Operating system
  • Credentials from the following internet banking sites:
    • Banco de Brasil
    • Auto Atendimento Banco de Brasil
    • Caixa Internet Banking
    • Itaú Banking
    • Any site with text "Internet banking"

Other Details

This Trojan Spy does the following:

  • It receives data from the folliowing websites:
    • https://docs.google.com/document/d/e/{BLOCKED}1vS_sV6OefdyzXWtL0LwZcspJIf6HvJ12v1MKAZQU33-neFhz2sTa22nrgtKrkw9XSqj4gcjyb92kgif/pub

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

15.804.03

FIRST VSAPI PATTERN DATE:

14 Apr 2020

VSAPI OPR PATTERN File:

15.805.00

VSAPI OPR PATTERN Date:

15 Apr 2020

Step 1

Trend Micro Predictive Machine Learning detects and blocks malware at the first sign of its existence, before it executes on your system. When enabled, your Trend Micro product detects this malware under the following machine learning name:

     
    • Troj.Win32.TRX.XXPE50FFF034

Step 2

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 3

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 4

Restart in Safe Mode

[ Learn More ]

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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • {Malware name}.exe = {Malware file path and name}.exe

Step 6

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.
  • {Malware file path}\{Random 8 characters from A-Z}.exe
  • {Malware file path}\music.mp3
  • {Malware file path}\{Computer name}.pdf
  • %User Startup%\{Random 8 characters from A-Z}.vbs

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TrojanSpy.Win32.NUMANDO.MSIDLDT . 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 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.

  • %AppDataLocal%\Google\Chrome\User Data\Local State
  • %Application Data%\Mozilla\Firefox\Profiles\{Default profile}\prefs.js


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