HKTL_USORMS

July 05, 2016
 PLATFORM:

Windows

 OVERALL RISK RATING:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 INFORMATION EXPOSURE:

  • Threat Type: Hacking Tool

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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:

4,271,710 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

05 Jul 2016

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 creates the following folders:

  • %User Temp%\7ZipSfx.000
  • %User Profile%\WindowsUpdateSystem

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

Other System Modifications

This hacking tool adds the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\Remote Utilities\
v4\Server\Parameters

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\Remote Utilities\
v4\Server\Parameters
notification = "{random values}"

HKEY_LOCAL_MACHINE\SYSTEM\Remote Utilities\
v4\Server\Parameters
UserAccess = "{random values}"

HKEY_LOCAL_MACHINE\SYSTEM\Remote Utilities\
v4\Server\Parameters
Password = "{random values}"

HKEY_LOCAL_MACHINE\SYSTEM\Remote Utilities\
v4\Server\Parameters
InternetId = "{random values}"

HKEY_LOCAL_MACHINE\SYSTEM\Remote Utilities\
v4\Server\Parameters
Options = "{random values}"

Dropping Routine

This hacking tool drops the following files:

  • %User Temp%\7ZipSfx.000\set22.reg
  • %User Temp%\7ZipSfx.000\install.cmd
  • %User Temp%\7ZipSfx.000\winmm.dll
  • %User Temp%\7ZipSfx.000\ripcserver.dll
  • %User Temp%\7ZipSfx.000\vp8decoder.dll
  • %User Temp%\7ZipSfx.000\rwln.dll
  • %User Temp%\7ZipSfx.000\vp8encoder.dll
  • %User Temp%\7ZipSfx.000\rfusclient.exe
  • %User Temp%\7ZipSfx.000\rutserv.exe

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

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.8

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

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_LOCAL_MACHINE\SYSTEM\Remote Utilities\v4\Server
    • Parameters

Step 3

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_LOCAL_MACHINE\SYSTEM\Remote Utilities\v4\Server\Parameters
    • notification = "{random values}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\Remote Utilities\v4\Server\Parameters
    • UserAccess = "{random values}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\Remote Utilities\v4\Server\Parameters
    • Password = "{random values}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\Remote Utilities\v4\Server\Parameters
    • InternetId = "{random values}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\Remote Utilities\v4\Server\Parameters
    • Options = "{random values}"

Step 4

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%\7ZipSfx.000\set22.reg
  • %User Temp%\7ZipSfx.000\install.cmd
  • %User Temp%\7ZipSfx.000\winmm.dll
  • %User Temp%\7ZipSfx.000\ripcserver.dll
  • %User Temp%\7ZipSfx.000\vp8decoder.dll
  • %User Temp%\7ZipSfx.000\rwln.dll
  • %User Temp%\7ZipSfx.000\vp8encoder.dll
  • %User Temp%\7ZipSfx.000\rfusclient.exe
  • %User Temp%\7ZipSfx.000\rutserv.exe

Step 5

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%\7ZipSfx.000
  • %User Profile%\WindowsUpdateSystem

Step 6

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