Analysis by: Mariefher Grace Villanueva
 PLATFORM:

Windows

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

  • 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.

  TECHNICAL DETAILS

File Size: 106452992 bytes
File Type: ISO
Memory Resident: Yes
Initial Samples Received Date: 19 Mar 2026

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 Details

This Trojan does the following:

  • This is an ISO file that contains the following malicious files:
    • 1.ry
    • atl.ini
    • Service.dll
    • vrfcore.dll
    • 詳しい内容.exe
  • When the executable 詳しい内容.exe is executed, it does the following:
    • It drops the following files:
      • %Public%\Music\Service.dll
      • %Public%\Music\atl.ini
    • It adds the following processes:
      • "%System%\svchost.exe" -k "Wtapise64"
      • "%System%\Rundll32.exe" "c:\users\public\music\service.dll",MainThread
    • It creates the following registry keys:
      • HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Wtapise64\Description = "为部署 Microsoft Stores应用程序提供基础结构支持。如果已禁用的Microsoft Stored应用程序未部署到系统此服务可能无法正常工作。"
      • HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Wtapise64\Parameters\ServiceDll = "C:\Users\Public\Music\Service.dll"
      • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Svchost\Wtapise64 = "Wtapise64"
      • HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Wtapise64\ServiceProtected = 1
    • It connects to the following possibly malicious URL:
      • ec2-43-207-218-80.ap-northeast-1.compute.{BLOCKED}aws.com:9888

  SOLUTION

Minimum Scan Engine: 9.800

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

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. Before you could do this, you must restart in Safe Mode. For instructions on how to do this, you may refer to this page If the preceding step requires you to restart in safe mode, you may proceed to edit the system registry.

 
  • In HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Wtapise64
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WindowsNT\CurrentVersion\Svchost\Wtapise64

Step 4

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.  
  • %Public%\Music\Service.dll
  • %Public%\Music\atl.ini

Step 5

Scan your computer with your Trend Micro product to delete files detected as Trojan.Win64.SIDELOADR.B. 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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