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Trojan.Win32.WACATAC.USXVPJ619

October 08, 2019
 ALIASES:

PUP-XBB-UW. (McAfee); HEUR:AdWare.Win32.Generic (Kaspersky)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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

It disables Task Manager, Registry Editor, and Folder Options.

  TECHNICAL DETAILS

File Size:

2,041,346 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

08 Oct 2019

Arrival Details

This Trojan 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 creates the following folders:

  • %User Temp%\Folder_Data_RC_ADDS\adds
  • %User Temp%\Folder_Data_RC_ADDS\xml
  • %Program Files%\Microsoft Data
  • %User Temp%\Folder_Data_RC_ADDS\js
  • %User Temp%\Folder_Data_RC_ADDS

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000(32-bit), Server 2003(32-bit), XP, Vista(64-bit), 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit) , or C:\Program Files (x86) in Windows XP(64-bit), Vista(64-bit), 7(64-bit), 8(64-bit), 8.1(64-bit), 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\SOFTWARE\Policies\
Google\Update

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Google\Update

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Policies\
Google\Update
UpdateDefault = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Google\Update
UpdateDefault = "0"

It creates the following registry entry(ies) to disable Task Manager, Registry Tools and Folder Options:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
FolderWSext = "65A4C6836999319B64"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
uniWSid = "1560173702228"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
insWStime = "1560173702"

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\Folder_Data_RC_ADDS\adds\addon.crx
  • %User Temp%\Folder_Data_RC_ADDS\js\ff_set.json
  • %User Temp%\Folder_Data_RC_ADDS\xml\op_wid.xml
  • %User Temp%\Folder_Data_RC_ADDS\xml\op_data.xml
  • %User Temp%\Folder_Data_RC_ADDS\js\chr_pref.json
  • %User Temp%\Folder_Data_RC_ADDS\xml\task.xml
  • %User Temp%\Folder_Data_RC_ADDS\adds\addon.xpi
  • %User Temp%\Folder_Data_RC_ADDS\adds\addon.oex
  • %program files%\microsoft data\{malware file name}.exe

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

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.850

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

Enable Registry Editor, Task Manager, and Folder options

[ Learn More ]
By doing this step, you also enable other applications/programs disabled by this malware/grayware/spyware. Screen reader support enabled.

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_CURRENT_USER\SOFTWARE\Policies\Google
    • Update
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Google
    • Update

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_CURRENT_USER\Software\Policies\Google\Update
    • UpdateDefault = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Google\Update
    • UpdateDefault = "0"

Step 5

Search and delete these components

[ Learn More ]
There may be some components 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.
  • %User Temp%\Folder_Data_RC_ADDS\adds\addon.crx
  • %User Temp%\Folder_Data_RC_ADDS\js\ff_set.json
  • %User Temp%\Folder_Data_RC_ADDS\xml\op_wid.xml
  • %User Temp%\Folder_Data_RC_ADDS\xml\op_data.xml
  • %User Temp%\Folder_Data_RC_ADDS\js\chr_pref.json
  • %User Temp%\Folder_Data_RC_ADDS\xml\task.xml
  • %User Temp%\Folder_Data_RC_ADDS\adds\addon.xpi
  • %User Temp%\Folder_Data_RC_ADDS\adds\addon.oex
  • %program files%\microsoft data\{malware file name}.exe

Step 6

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %User Temp%\Folder_Data_RC_ADDS\adds
  • %User Temp%\Folder_Data_RC_ADDS\xml
  • %Program Files%\Microsoft Data
  • %User Temp%\Folder_Data_RC_ADDS\js
  • %User Temp%\Folder_Data_RC_ADDS

Step 7

Scan your computer with your Trend Micro product to delete files detected as Trojan.Win32.WACATAC.USXVPJ619. 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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