Analysis by: Paolo Ronniel Labrador
ALIASES:

Riskware/DownloadSponsor (FORTINET)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet, Dropped by other malware

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: 961,360 bytes
File Type: EXE
Initial Samples Received Date: 27 Aug 2025
Payload: Connects to URLs/IPs, Drops 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.

Installation

This Trojan drops the following files:

  • %User Temp%\~{random}.TMP
  • %User Temp%\OCS\{random}.dat
  • %User Temp%\OCS\ocs_v71b.exe -> detected as TROJ_SPNR.0CHD14
  • %User Temp%\OCS\ICSharpCode.SharpZipLib.dll

(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).)

It adds the following processes:

  • %User Temp%\OCS\ocs_v71b.exe -install -81 -dhtechradar -fb70afb507c34256b3e97fa291fa232e - - -{random} -{random}

(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).)

It creates the following folders:

  • %User Temp%\OCS

(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).)

Other System Modifications

This Trojan adds the following registry entries:

HKEY_CURRENT_USER\Software\OCS
CID = {GUID}

HKEY_CURRENT_USER\Software\OCS
PID = dhtechradar

HKEY_CURRENT_USER\Software\OCS
lastPID = dhtechradar

Other Details

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\OCS

It connects to the following possibly malicious URL:

  • http://{BLOCKED}abs-ltd.de/geoip.php
  • http://{BLOCKED}ownload-sponsor.de/dotnet/com

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 20.416.08
FIRST VSAPI PATTERN DATE: 25 Aug 2025
VSAPI OPR PATTERN File: 20.417.00
VSAPI OPR PATTERN Date: 26 Aug 2025

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.XXPE50FFF096

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

Delete these registry values

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator’s help. You may also check out this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\OCS
    • CID = {GUID}
  • In HKEY_CURRENT_USER\Software\OCS
    • PID = dhtechradar
  • In HKEY_CURRENT_USER\Software\OCS
    • PID = dhtechradar

Step 5

Delete this registry key

[ Learn More ]

=Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator’s help. You may also check out this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\OCS

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.
  • %User Temp%\~{random}.TMP
  • %User Temp%\OCS\{random}.dat
  • %User Temp%\OCS\ocs_v71b.exe
  • %User Temp%\OCS\ICSharpCode.SharpZipLib.dll

Step 7

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%\OCS

Step 8

Scan your computer with your Trend Micro product to delete files detected as TROJ_FRS.0NA103HP25. 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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