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TrojanSpy.Win32.BROWALL.A

September 10, 2021
 Analysis by: Warren Adam Sto. Tomas
 ALIASES:

Trojan.Win32.Bsymem.acrv (Kaspersky)

 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 may be dropped by other malware.

It connects to certain websites to send and receive information.

  TECHNICAL DETAILS

File Size:

1,662,464 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

09 Aug 2021

Payload:

Connects to URLs/IPs, Steals 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.

It may be dropped by the following malware:

Other System Modifications

This Trojan Spy modifies the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows Defender\Real-Time Protection
DisableOnAccessProtection = 1

(Note: The default value data of the said registry entry is {user preference}.)

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows Defender\Real-Time Protection
DisableScanOnRealtimeEnable = 1

(Note: The default value data of the said registry entry is {user preference}.)

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows Defender\Real-Time Protection
DisableRealtimeMonitoring = 1

(Note: The default value data of the said registry entry is {user preference}.)

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows Defender\Real-Time Protection
DisableIOAVProtection = 1

(Note: The default value data of the said registry entry is {user preference}.)

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows Defender\Real-Time Protection
DisableRawWriteNotification = 1

(Note: The default value data of the said registry entry is {user preference}.)

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows Defender\Real-Time Protection
DisableBehaviorMonitoring = 1

(Note: The default value data of the said registry entry is {user preference}.)

Information Theft

This Trojan Spy gathers the following data:

  • Browser applications:
    • Opera
    • Chrome
    • Brave-Browser
    • CryptoTab Browser
    • Edge
  • Stored cryptocurrency wallets in the following directories:
    • %Application Data%\atomic
    • %Application Data%\com.liberty.jaxx
    • %Application Data%\Electrum
    • %Application Data%\Exodus
    • %Application Data%\MultiDoge
    • %Application Data%\Monero
    • %Application Data%\binance.chain
    • %Application Data%\Metamask

(Note: %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).)

Other Details

This Trojan Spy connects to the following URL(s) to get the affected system's IP address:

  • https://ipinfo.io

It connects to the following website to send and receive information:

  • http://{BLOCKED}.{BLOCKED}.11.8/server.txt
  • http://{BLOCKED}.{BLOCKED}.8.23/proxies.txt
  • http://{BLOCKED}gon.ru/api/setStats.php

Mobile Malware Routine

This Trojan Spy sends the gathered information via HTTP POST to the following URL(s):

  • http://{BLOCKED}.{BLOCKED}.10.237/base/api/getData.php

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

16.956.05

FIRST VSAPI PATTERN DATE:

09 Sep 2021

VSAPI OPR PATTERN File:

16.957.00

VSAPI OPR PATTERN Date:

10 Sep 2021

Step 1

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 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.BROWALL.A

[ 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

Restore this modified 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\Policies\Microsoft\Windows Defender\Real-Time Protection
    • DisableOnAccessProtection = 1
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection
    • DisableScanOnRealtimeEnable = 1
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection
    • DisableRealtimeMonitoring = 1
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection
    • DisableIOAVProtection = 1
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection
    • DisableRawWriteNotification = 1
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection
    • DisableBehaviorMonitoring = 1

Step 5

Scan your computer with your Trend Micro product to delete files detected as TrojanSpy.Win32.BROWALL.A. 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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