PUA_SYSTWEAK.GB

September 04, 2018

ALIASES:

PUA.RegCleanPro (Norton); MSIL/AdvancedSystemProtector.C (NOD32); RiskTool.Win32.SystemTweaker.ah (Kaspersky)

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:

5,709,096 bytes

File Type:

EXE

Memory Resident:

Initial Samples Received Date:

30 Aug 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\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
%Windows%\Tasks\RegClean Pro_DEFAULT.job
%Windows%\Tasks\RegClean Pro_UPDATES.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.. %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

(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.)

Other System Modifications

This Potentially Unwanted Application adds the following registry keys:

HKEY_CURRENT_USER\Software\Systweak\
RegClean Pro

HKEY_CURRENT_USER\Software\Systweak\
RegClean Pro\Version 6.1

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

HKEY_LOCAL_MACHINE\SOFTWARE\Systweak

HKEY_LOCAL_MACHINE\SOFTWARE\Systweak\
Params

HKEY_LOCAL_MACHINE\SOFTWARE\Systweak\
RegClean Pro

HKEY_LOCAL_MACHINE\SOFTWARE\Systweak\
RegClean Pro\Version 6.1

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

HKEY_CURRENT_USER\Software\Systweak

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Systweak
MachineID = ""

HKEY_CURRENT_USER\Software\Systweak\
RegClean Pro
ErrorCount = 0

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

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

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
ImprovementProgram = 1

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

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

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

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

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 = ""

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

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

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

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

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

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

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

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

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

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

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 = dyituser_764

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" /silent"

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.systweak.com/RegCleanPro/

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
RegClean Pro_is1
HelpLink = http://www.systweak.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 = {yyyymmdd}

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 = 17871

HKEY_LOCAL_MACHINE\SOFTWARE\Systweak
MachineID = ""

HKEY_LOCAL_MACHINE\SOFTWARE\Systweak\
Params
utm_source = softonic

HKEY_LOCAL_MACHINE\SOFTWARE\Systweak\
Params
utm_campaign = catsecurity

HKEY_LOCAL_MACHINE\SOFTWARE\Systweak\
Params
utm_medium = newbuild

HKEY_LOCAL_MACHINE\SOFTWARE\Systweak\
Params
affiliateid = ""

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

HKEY_LOCAL_MACHINE\SOFTWARE\Systweak\
RegClean Pro\Version 6.1
TELNOSPAIN = (801) 432-6563

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

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

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.systweak.com/registryCleaner/price/en?utm_source=softonic&utm_campaign=catsecurity&utm_medium=newbuild

HKEY_LOCAL_MACHINE\SOFTWARE\Systweak\
RegClean Pro\Version 6.1
RENEWALURL = http://www.systweak.com/registrycleaner/renewal.asp?utm_source=softonic&utm_campaign=catsecurity&utm_medium=newbuild

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

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

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

HKEY_LOCAL_MACHINE\SOFTWARE\Systweak\
RegClean Pro\Version 6.1
amazonparams = /ACTION=install /COMPONENTS=toolbar

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

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

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

Other Details

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

http://cdn.{BLOCKED}ak.com/safedl/distro-amzn-installmonetizer-rs.exe
http://www.{BLOCKED}ak.com/registryCleaner/afterinstall.asp?newrcp=1&utm_content=AfterInstall&utm_term=Setup&page=install&utm_source=softonic&utm_campaign=catsecurity&utm_medium=newbuild&LangID=en

SOLUTION

Minimum Scan Engine:

9.850

SSAPI PATTERN File:

1.995.00

SSAPI PATTERN Date:

06 Sep 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

Identify and terminate files detected as PUA_SYSTWEAK.GB

[ Learn More ]

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.
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.
If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 3

Remove PUA_SYSTWEAK.GB by using its own Uninstall option

[ Learn More ]

To uninstall the grayware process

Step 4

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

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