Analysis by: John Anthony Banes
ALIASES:

HEUR:RiskTool.Win32.SystemTweaker.gen (Kaspersky); a variant of Win32/Systweak.U (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: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet

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: 4,317,840 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 08 Jan 2019
Payload: Connects to URLs/IPs, Displays windows

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%\Advanced System Protector\aspsetup.exe
  • %Application Data%\Systweak\RegClean Pro\Version 6.1\eng_rcp.dat
  • %Application Data%\Systweak\RegClean Pro\Version 6.1\ExcludeList.rcp
  • %Application Data%\Systweak\RegClean Pro\Version 6.1\log_{mm-dd-yyyy}.log
  • %Application Data%\Systweak\RegClean Pro\Version 6.1\results.rcp
  • %Application Data%\Systweak\RegClean Pro\Version 6.1\TempHLList.rcp
  • %Desktop%\RegClean Pro.lnk
  • %Program Files%\RegClean Pro\Chinese_rcp.ini
  • %Program Files%\RegClean Pro\CleanSchedule.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\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
  • %User Temp%\is-{random}.tmp\_isetup
  • %User Temp%\is-{random}.tmp\_isetup\_shfoldr.dll
  • %User Temp%\is-{random}.tmp\_isetup\_shfoldr.dll
  • %User Temp%\is-{random}.tmp\3.tmp
  • %User Temp%\is-{random}.tmp\isxdl.dll
  • %User Temp%\is-{random}.tmp\roboot.exe
  • %User Temp%\is-{random}.tmp\setup_en.bmp
  • %User Temp%\is-{random}.tmp\systweakasp.tmp
  • %Windows%\RegClean Pro_UPDATES.job
  • %Windows%\Tasks\RegClean Pro_DEFAULT.job

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, and 8.. %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\Desktop on Windows Vista, 7, and 8.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), 7 (32-bit), and 8 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), 7 (64-bit), and 8 (64-bit).. %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu on Windows Vista, 7, and 8.. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, and 8.. %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)

It drops and executes the following files:

  • %Program Files%\RegClean Pro\RegCleanPro.exe

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), 7 (32-bit), and 8 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), 7 (64-bit), and 8 (64-bit).)

It creates the following folders:

  • %Application Data%\Advanced System Protector
  • %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 current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, and 8.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), 7 (32-bit), and 8 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), 7 (64-bit), and 8 (64-bit).. %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu on Windows Vista, 7, and 8.. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, and 8.)

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_LOCAL_MACHINE\SOFTWARE\Microsoft\
RFC1156Agent

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
RFC1156Agent\CurrentVersion

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
RFC1156Agent\CurrentVersion\Parameters

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

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

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Systweak\
RegClean Pro\Version 6.1
TELNO = {BLOCKED}-7918

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

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

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=softonic_new&utm_campaign=jp_pd_new&utm_medium=newbuild

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

HKEY_LOCAL_MACHINE\SOFTWARE\Systweak\
Params
utm_source = softonic_new

HKEY_LOCAL_MACHINE\SOFTWARE\Systweak\
Params
utm_campaign = jp_pd_new

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 = 5.5.1 (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 = dyitusr481

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 = 20190108

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_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
RegClean Pro_is1
EstimatedSize = 14394

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
RFC1156Agent\CurrentVersion\Parameters
TrapPollTimeMilliSecs = 15000

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{459DD0F7-0D55-D3DC-67BC-E6BE37E9D762}
(Default) = Microsoft ATSC Network Provider

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{459DD0F7-0D55-D3DC-67BC-E6BE37E9D762}\InprocServer32
(Default) = C:\Windows\System32\MSDvbNP.ax

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

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

HKEY_LOCAL_MACHINE\SOFTWARE\Systweak\
RegClean Pro\Version 6.1
Expired = 0

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

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

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

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

HKEY_CURRENT_USER\Software\Systweak\
RegClean Pro\Version 6.1
StrLatestRestorePoint = ""

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

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

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

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

HKEY_CURRENT_USER\Software\Systweak\
RegClean Pro\Version 6.1
CurrentScanTime = {hex values}

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

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

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

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

HKEY_CURRENT_USER\Software\Systweak\
RegClean Pro
ErrorCount = {number}

HKEY_CURRENT_USER\Software\Systweak\
RegClean Pro\Version 6.1
StrLatestRegDefrag = ""

HKEY_CURRENT_USER\Software\Systweak\
RegClean Pro\Version 6.1
StrLastStartupOpt = ""

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

HKEY_CURRENT_USER\Software\Systweak\
RegClean Pro\Version 6.1
ScheduledTime = ""

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

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

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

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

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

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

HKEY_CURRENT_USER\Software\Systweak\
RegClean Pro\Version 6.1
StrLastScan = {day}. {month} {dd}, {yyyy}. {hh:mm} {AM/PM}

HKEY_CURRENT_USER\Software\Systweak\
RegClean Pro\Version 6.1
StrLastOptimizeTime = ""

Other Details

This Potentially Unwanted Application does the following:

  • It opens the following URL after installation:
    https://www.{BLOCKED}ak.com/registry-cleaner/after-install?newrcp=1&utm_content=AfterInstall&utm_term=Setup&page=install&utm_source=softonic_new&utm_campaign=jp_pd_new&utm_medium=newbuild&LangID=en

NOTES:

It displays the following fake registry scanning window:

It requires the user to buy the full version to use the product:

Closing the program will display the following message:

  SOLUTION

Minimum Scan Engine: 9.850
SSAPI PATTERN File: 2.137.00
SSAPI PATTERN Date: 10 Jan 2019

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.Win32.RegCleanPro.GA

[ 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.Win32.RegCleanPro.GA 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.Win32.RegCleanPro.GA. 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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