Analysis by: Clive Fuentebella
ALIASES:

a variant of Win32/RemoteAdmin.RemoteUtilities.V potentially unsafe application (NOD32)

 PLATFORM:

Windows

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

  • Threat Type: Hacking Tool

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

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

This Hacking Tool 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: 6,386,121 bytes
File Type: EXE
Memory Resident: Yes
Payload: Drops files

Arrival Details

This Hacking Tool 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 Hacking Tool drops the following files:

  • %ProgramData%\Immunity\wet.vbs (executes exe.cmd)
  • %ProgramData%\Immunity\exe.cmd (executes and establishes persistence for rutserv.exe)
  • %ProgramData%\Immunity\libeay32.dll
  • %ProgramData%\Immunity\res.reg
  • %ProgramData%\Immunity\rutserv.exe
  • %ProgramData%\Immunity\settings.dat
  • %ProgramData%\Immunity\ssleay32.dll
  • %ProgramData%\Immunity\rfusclient.exe
  • %ProgramData%\Remote Manipulator System\install.log
  • %Application Data%\RMS Agent\Logs\rms_log_{Date}.html (displays connection logs)

(Note: %ProgramData% is a version of the Program Files folder where any user on a multi-user computer can make changes to programs. This contains application data for all users. This is usually C:\ProgramData on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit), or C:\Documents and Settings\All Users on Windows Server 2003(32-bit), 2000(32-bit) and XP.. %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).)

Autostart Technique

This Hacking Tool adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
not = %ProgramData%\Immunity\rutserv.exe

Other System Modifications

This Hacking Tool adds the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\RMS Host Installer
Security = {Binary data}

HKEY_LOCAL_MACHINE\SYSTEM\RMS Host Installer
General = {Binary data}

HKEY_LOCAL_MACHINE\SYSTEM\RMS Host Installer
CallbackSettings = {Binary data}

HKEY_LOCAL_MACHINE\SYSTEM\{Control set}\
services\RManService
ObjectName = LocalSystem

HKEY_LOCAL_MACHINE\SYSTEM\{Control set}\
services\RManService
WOW64 = 1

HKEY_LOCAL_MACHINE\SYSTEM\{Control set}\
services\RManService
DependOnService = {Binary data}

HKEY_LOCAL_MACHINE\SYSTEM\{Control set}\
services\RManService
DisplayName = TektonIT - RMS Host

HKEY_LOCAL_MACHINE\SYSTEM\{Control set}\
services\RManService
ImagePath = %ProgramData%\Immunity\rutserv.exe

HKEY_LOCAL_MACHINE\SYSTEM\{Control set}\
services\RManService
ErrorControl = 1

HKEY_LOCAL_MACHINE\SYSTEM\{Control set}\
services\RManService
Start = 2

HKEY_LOCAL_MACHINE\SYSTEM\{Control set}\
services\RManService
Type = 16

HKEY_LOCAL_MACHINE\SYSTEM\{Control set}\
services\RManService
Description = Allows windows driver machine.

HKEY_LOCAL_MACHINE\SYSTEM\{Control set}\
services\RManService
Group =

HKEY_LOCAL_MACHINE\SYSTEM\{Control set}\
services\RManService
FailureActions = {Binary data}

HKEY_CURRENT_USER\TektonIT\Remote Manipulator System\
Host\Parameters
notification = {Binary data}

Other Details

This Hacking Tool adds the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\RMS Host Installer

HKEY_LOCAL_MACHINE\SYSTEM\{Control set}\
services\RManService

It does the following:

  • It executes the following commands from a remote user:
    • Whitelist and blacklist IP addresses
    • Capture screenshots or screen recordings
    • See opened processes via task manager
    • Remote control
    • Remote execute
    • Remote printing
    • Send messages
    • Manage files
    • Manage registries
    • Shutdown machine
  • The sample is a self-extracting archive containing the hacktool and its components.

It accepts the following parameters:

  • /silentinstall - Install host service
  • /silentuninstall - Uninstall host service
  • /start - Start server
  • /stop - Stop server
  • /firewall - Integrate with firewall
  • /config - Setup config window

  SOLUTION

Minimum Scan Engine: 9.800
SSAPI PATTERN File: 2.407.00
SSAPI PATTERN Date: 13 May 2021

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.XXPE50FSX010

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

Restart in Safe Mode

[ Learn More ]

Step 5

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\Microsoft\Windows\CurrentVersion\Run
    • not=%ProgramData%\Immunity\rutserv.exe
  • In HKEY_CURRENT_USER\TektonIT\Remote Manipulator System\Host\Parameters
    • notification={Binary data}

Step 6

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
    • RMS Host Installer
  • In HKEY_LOCAL_MACHINE\SYSTEM\{Control set}\services\
    • RManService

Step 7

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.
  • %ProgramData%\Immunity\wet.vbs
  • %ProgramData%\Immunity\exe.cmd
  • %ProgramData%\Immunity\libeay32.dll
  • %ProgramData%\Immunity\res.reg
  • %ProgramData%\Immunity\rutserv.exe
  • %ProgramData%\Immunity\settings.dat
  • %ProgramData%\Immunity\ssleay32.dll
  • %ProgramData%\Immunity\rfusclient.exe
  • %ProgramData%\Remote Manipulator System\install.log
  • %Application Data%\RMS Agent\Logs\rms_log_{Date}.html

Step 8

Restart in normal mode and scan your computer with your Trend Micro product for files detected as HackTool.Win32.Radmin.GQ. 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.


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