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PUA_REGCLEANPRO.GC

May 17, 2018
 Analysis by: John Anthony Banes
 ALIASES:

RiskTool.Win32.SystemTweaker.ah (Kaspersky); Win32/Systweak (NOD32); PUA.RegCleanPro (Norton)

 PLATFORM:

Windows

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

  • Threat Type: Potentially Unwanted Application

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Potentially Unwanted Application arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites. It may be manually installed by a user.

  TECHNICAL DETAILS

File Size:

4,433,416 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

16 May 2018

Arrival Details

This Potentially Unwanted Application arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It may be manually installed by a user.

Installation

This Potentially Unwanted Application drops the following files:

  • %Application Data%\Systweak\RegClean Pro\Version 6.1\eng_rcp.dat
  • %Application Data%\Systweak\RegClean Pro\Version 6.1\log_{mm-dd-yyyy}.log
  • %Desktop%\RegClean Pro.lnk
  • %Program Files%\RegClean Pro\Chinese_rcp.ini
  • %Program Files%\RegClean Pro\CleanSchedule.exe
  • %Program Files%\RegClean Pro\Cloud_Backup_Setup.exe
  • %Program Files%\RegClean Pro\Cloud_Backup_Setup_Intl.exe
  • %Program Files%\RegClean Pro\Danish_rcp.ini
  • %Program Files%\RegClean Pro\Dutch_rcp.ini
  • %Program Files%\RegClean Pro\eng_rcp.ini
  • %Program Files%\RegClean Pro\Finnish_rcp_fi.ini
  • %Program Files%\RegClean Pro\French_rcp.ini
  • %Program Files%\RegClean Pro\German_rcp.ini
  • %Program Files%\RegClean Pro\greek_rcp_el.ini
  • %Program Files%\RegClean Pro\install_left_image.bmp
  • %Program Files%\RegClean Pro\is-{random}.tmp
  • %Program Files%\RegClean Pro\isxdl.dll
  • %Program Files%\RegClean Pro\Italian_rcp.ini
  • %Program Files%\RegClean Pro\Japanese_rcp.ini
  • %Program Files%\RegClean Pro\korean_rcp_ko.ini
  • %Program Files%\RegClean Pro\Norwegian_rcp.ini
  • %Program Files%\RegClean Pro\polish_rcp_pl.ini
  • %Program Files%\RegClean Pro\portugese_rcp_pt.ini
  • %Program Files%\RegClean Pro\Portuguese_rcp.ini
  • %Program Files%\RegClean Pro\RCPUninstall.exe
  • %Program Files%\RegClean Pro\RegCleanPro.dll
  • %Program Files%\RegClean Pro\RegCleanPro.exe
  • %Program Files%\RegClean Pro\russian_rcp_ru.ini
  • %Program Files%\RegClean Pro\Spanish_rcp.ini
  • %Program Files%\RegClean Pro\Swedish_rcp.ini
  • %Program Files%\RegClean Pro\systweakasp.exe
  • %Program Files%\RegClean Pro\TraditionalCn_rcp_zh-tw.ini
  • %Program Files%\RegClean Pro\turkish_rcp_tr.ini
  • %Program Files%\RegClean Pro\unins000.dat
  • %Program Files%\RegClean Pro\unins000.exe
  • %Program Files%\RegClean Pro\unins000.msg
  • %Program Files%\RegClean Pro\xmllite.dll
  • %Start Menu%\Programs\RegClean Pro\RegClean Pro.lnk
  • %Start Menu%\Programs\RegClean Pro\Register RegClean Pro.lnk
  • %Start Menu%\Programs\RegClean Pro\Uninstall RegClean Pro.lnk
  • %System%\roboot.exe
  • %User Temp%\is-{random}.tmp\_isetup\_shfoldr.dll
  • %User Temp%\is-{random}.tmp\1.tmp
  • %User Temp%\is-{random}.tmp\amazon_en.bmp
  • %User Temp%\is-{random}.tmp\pcbackup.bmp
  • %User Temp%\is-{random}.tmp\roboot.exe
  • %User Temp%\is-{random}.tmp\setup_en.bmp
  • %Windows%\Tasks\RegClean Pro_DEFAULT.job
  • %Windows%\Tasks\RegClean Pro_UPDATES.job

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming 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.. %Desktop% is the desktop folder, where it usually is C:\Documents and Settings\{user name}\Desktop in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\Desktop in 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.. %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.. %Start Menu% is the Start Menu folder, where it usually is C:\Documents and Settings\{user name}\Start Menu on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu 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.. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %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.. %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)

It creates the following folders:

  • %Application Data%\Systweak
  • %Application Data%\Systweak\RegClean Pro
  • %Application Data%\Systweak\RegClean Pro\Version 6.1
  • %Program Files%\RegClean Pro
  • %Start Menu%\Programs\RegClean Pro
  • %User Temp%\is-{random}.tmp
  • %User Temp%\is-{random}.tmp\_isetup

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming 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.. %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.. %Start Menu% is the Start Menu folder, where it usually is C:\Documents and Settings\{user name}\Start Menu on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu 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 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.)

Other System Modifications

This Potentially Unwanted Application adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Systweak

HKEY_LOCAL_MACHINE\SOFTWARE\Systweak\
RegClean Pro

HKEY_LOCAL_MACHINE\SOFTWARE\Systweak\
RegClean Pro\Version 6.1

HKEY_LOCAL_MACHINE\SOFTWARE\Systweak\
Params

HKEY_CURRENT_USER\Software\Systweak

HKEY_CURRENT_USER\Software\Systweak\
RegClean Pro

HKEY_CURRENT_USER\Software\Systweak\
RegClean Pro\Version 6.1

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
RegClean Pro_is1

HKEY_CURRENT_USER\Software\Systweak\
RegClean Pro\Version 6.1\LANG

HKEY_LOCAL_MACHINE\SOFTWARE\Systweak\
RegClean Pro\Version 6.1\LANG

HKEY_CURRENT_USER\Software\Licenses

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{459DD0F7-0D55-D3DC-67BC-E6BE37E9D762}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{459DD0F7-0D55-D3DC-67BC-E6BE37E9D762}\InprocServer32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{459DD0F7-0D55-D3DC-67BC-E6BE37E9D762}\InprocServer32\
12.0.0.0

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Systweak\
RegClean Pro\Version 6.1
TELNO = (800) 871-7918

HKEY_LOCAL_MACHINE\SOFTWARE\Systweak\
RegClean Pro\Version 6.1
utm_source = marm

HKEY_LOCAL_MACHINE\SOFTWARE\Systweak\
RegClean Pro\Version 6.1
utm_campaign = 1

HKEY_LOCAL_MACHINE\SOFTWARE\Systweak\
RegClean Pro\Version 6.1
utm_medium = newbuild

HKEY_LOCAL_MACHINE\SOFTWARE\Systweak\
RegClean Pro\Version 6.1
RCPURL = http://www.{BLOCKED}ak.com/registryCleaner/price/en?utm_source=marm&utm_campaign=1&utm_medium=newbuild

HKEY_LOCAL_MACHINE\SOFTWARE\Systweak\
RegClean Pro\Version 6.1
RENEWALURL = http://www.{BLOCKED}ak.com/registrycleaner/renewal.asp?utm_source=marm&utm_campaign=1&utm_medium=newbuild

HKEY_LOCAL_MACHINE\SOFTWARE\Systweak\
Params
utm_source = marm

HKEY_LOCAL_MACHINE\SOFTWARE\Systweak\
Params
utm_campaign = 1

HKEY_LOCAL_MACHINE\SOFTWARE\Systweak\
Params
utm_medium = newbuild

HKEY_LOCAL_MACHINE\SOFTWARE\Systweak\
Params
affiliateid =

HKEY_CURRENT_USER\Software\Systweak\
RegClean Pro\Version 6.1
StartAutoScanPMUI = 1

HKEY_CURRENT_USER\Software\Systweak\
RegClean Pro\Version 6.1
StartAutoScanOnLaunch = 0

HKEY_CURRENT_USER\Software\Systweak\
RegClean Pro\Version 6.1
StartAutoTutorial = 1

HKEY_CURRENT_USER\Software\Systweak\
RegClean Pro\Version 6.1
TrialType = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Systweak\
RegClean Pro\Version 6.1
MaxFixLimit = 15

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
RegClean Pro_is1
Inno Setup: Setup Version = 5.5.2 (u)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
RegClean Pro_is1
Inno Setup: App Path = %Program Files%\RegClean Pro

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
RegClean Pro_is1
InstallLocation = %Program Files%\RegClean Pro\

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
RegClean Pro_is1
Inno Setup: Icon Group = RegClean Pro

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
RegClean Pro_is1
Inno Setup: User = {BLOCKED}er_xp32

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
RegClean Pro_is1
Inno Setup: Language = en

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
RegClean Pro_is1
DisplayName = RegClean Pro

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
RegClean Pro_is1
DisplayIcon = %Program Files%\RegClean Pro\Regcleanpro.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
RegClean Pro_is1
UninstallString = %Program Files%\RegClean Pro\unins000.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
RegClean Pro_is1
QuietUninstallString = %Program Files%\RegClean Pro\unins000.exe /SILENT

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
RegClean Pro_is1
DisplayVersion = 6.21

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
RegClean Pro_is1
Publisher = Systweak Inc

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
RegClean Pro_is1
URLInfoAbout = http://www.{BLOCKED}ak.com/RegCleanPro/

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
RegClean Pro_is1
HelpLink = http://www.{BLOCKED}ak.com/RegCleanPro/

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
RegClean Pro_is1
NoModify = 1

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
RegClean Pro_is1
NoRepair = 1

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
RegClean Pro_is1
InstallDate = 20180517

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
RegClean Pro_is1
MajorVersion = 6

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
RegClean Pro_is1
MinorVersion = 21

HKEY_CURRENT_USER\Software\Systweak\
RegClean Pro\Version 6.1\LANG
LangCode = en

HKEY_LOCAL_MACHINE\SOFTWARE\Systweak\
RegClean Pro\Version 6.1\LANG
LangID = 0

HKEY_CURRENT_USER\Software\Systweak\
RegClean Pro\Version 6.1\LANG
LangID = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
RegClean Pro_is1
UninstallString = %Program Files%\RegClean Pro\unins000.exe /silent

Other Details

This Potentially Unwanted Application connects to the following possibly malicious URL:

  • http://www.{BLOCKED}ak.com/registryCleaner/afterinstall.asp?newrcp=1&utm_content=AfterInstall&utm_term=Setup&page=install&utm_source=marm&utm_campaign=1&utm_medium=newbuild&LangID=en

  SOLUTION

Minimum Scan Engine:

9.850

SSAPI PATTERN File:

1.951.00

SSAPI PATTERN Date:

17 May 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

Identify and terminate files detected as PUA_REGCLEANPRO.GC

[ 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 4

Remove PUA_REGCLEANPRO.GC by using its own Uninstall option

[ Learn More ]
To uninstall the grayware process

Step 5

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