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Remove Comet Systems from Chrome, Firefox, IE



Threat's profile Threat indicator: HIGH

Name of the threat:Comet Systems

Command or file name:siuninst.exe

Threat type:Hijacker

Affected OS:Win32/Win64 (Windows XP, Vista/7, 8/8.1, Windows 10)

Affected browsers:Google Chrome, Mozilla Firefox, Internet Explorer, Safari

They do not develop by themselves and ordinarily must be setup as any other software with or without user content. Whenever a consumer visits such a Web site or clicks on such a pop-up, noxious scripts immediately install a Comet Systems. Transforms needed web browser settings, degrades default security level and adds undesirable or unsafe resources to the Trusted sites list. Changes World wide web browser's default search page to a ordained WWW site without buyer consent. In some cases even a spyware removal utility can fail to liquidate a specific Comet Systems. As it was said above most Comet Systemss are quite resembling to spyware and advertisement threats and therefore cannot be killd with the help of popular antivirus creations.


Comet Systems intrusion method

Usually Comet Systems comes bundled with freeware downloads. During installation you can be offered to change default homepage and search engine to Comet Systems. Comet Systems copies its file(s) to your hard disk. Its typical file name is siuninst.exe. Then it creates new startup key with name Comet Systems and value siuninst.exe. You can also find it in your processes list with name siuninst.exe or Comet Systems. Also, it can create folder with name Comet Systems under C:\Program Files\ or C:\ProgramData. If you have further questions about Comet Systems, please ask below. You can use programs to remove Comet Systems from your browsers below.


Download Removal Tool

Download this advanced removal tool and solve problems with Comet Systems and siuninst.exe (download of fix will start immediately):

Download WiperSoft Antispyware to remove Comet Systems

* WiperSoft Antispyware was developed to remove threats like Comet Systems in automatic mode. Remover has active module to protect PC from hijackers, trojans, ransomware and other viruses. Trial version of Wipersoft provides detection of computer viruses for FREE. To remove malware, you have to purchase the full version of Wipersoft.


Features of WiperSoft Antispyware Malware Remediation Tool

  • Removes all files created by viruses.
  • Removes all registry entries created by viruses.
  • You can activate System and Network Guards and forget about malware.
  • Can fix browser problems and protect browser settings.
  • Removal is guaranteed - if Removal Tool fails ask for FREE support.
  • 24/7 Spyware Helpdesk Support included into the package.

  • Download Spyhunter Remediation Tool by Enigma Software

    Download antimalware designed specifically to remove threats like Comet Systems and siuninst.exe (download of fix will start immediately):

    Download AntiMalware to remove Comet Systems

    Features of Spyhunter Remediation Tool

    • Removes all files created by Comet Systems.
    • Removes all registry entries created by Comet Systems.
    • Fixes browser redirection and hijack if needed.
    • "Toolbar Remover" tool will help you get rid of unwanted browser extensions.
    • Removal is guaranteed - if Spyhunter Remediation Tool fails ask for FREE support.
    • 24/7 Helpdesk Support and 5 hours of Remote Support via GoToAssist included into the package.


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Software Industry Professionals Member Threat's description and solution are developed by Security Stronghold security team.

Here you can also learn:


How to remove Comet Systems manually

This problem can be solved manually by deleting all registry keys and files connected with Comet Systems, removing it from startup list and unregistering all corresponding DLLs. Additionally missing DLL's should be restored from distribution in case they are corrupted by Comet Systems.

To get rid of Comet Systems, you should:

1. Kill the following processes and delete the appropriate files:

  • bandmessage.xml
  • buttonmessage.xml
  • cars.xsl
  • comet systems.txt
  • cometspin2h[1].cu_
  • cometspin2[1].an_
  • defaultbuttonmessage.xml
  • flights.xsl
  • hotels.xsl
  • masterconfig.xml
  • related.xml
  • related.xsl
  • sys_except.xml
  • travel_context.xml
  • un_adzap.xml
  • un_autosearch.xml
  • un_errorsearch.xml
  • un_funbutton.xml
  • un_funcursors.xml
  • un_platform.xml
  • un_refbutton.xml
  • un_relatedsearch.xml
  • un_searchassist.xml
  • un_shopbutton.xml
  • un_travel.xml
  • un_travelbutton.xml
  • un_webbutton.xml
  • un_webcursors.xml
  • comet cursor.lnk
  • comet.exe
  • comutil.dll
  • csadzap.dll
  • csapputil.dll
  • csband.dll
  • csbho.dll
  • csbrange.dll
  • cscore.dll
  • csctx.dll
  • cseng.dll
  • csietb.dll
  • csinst.dll
  • csinstall.exe
  • cstray.exe
  • csutil.dll
  • fileutil.dll
  • skinui.dll
  • introcc.js
  • adzap.htm
  • adzap.js
  • adzap_tb.js
  • azunins.js
  • scr_adzap.js
  • sp4update.js
  • fclnk.exe
  • mccoff.js
  • onlinecheck.js
  • scr_mcc.js
  • scr_wait.js
  • refbutton.js
  • autosrch.js
  • related.js
  • tbproducts.js
  • travel.js
  • core.js
  • 43prodconv.js
  • band.js
  • brdwnld.js
  • cnfmgr.js
  • context.js
  • controlpanel.js
  • license.js
  • logging.js
  • tbmgr.js
  • toolbar.js
  • update.js
  • utillauncher.js
  • winutil.js
  • addremove.htm
  • addremove.js
  • addremove_cc.js
  • messaging.js
  • message.js
  • adzap_0001.js
  • travel_0001.js
  • intro.js
  • cc_43.inf
  • comet.dll
  • siuninst.exe
  • sinstaller.inf

Warning: you should delete only those files which checksums are listed as malicious. There may be valid files with the same names in your system. We recommend you to use WiperSoft Antispyware Malware Remediation Tool for safe problem solution.

**Trial version of Wipersoft provides detection of computer viruses for FREE. To remove malware, you have to purchase the full version of Wipersoft.

2. Delete the following malicious folders:

  • %programfiles%\comet systems\
  • %programfiles%\comet\bin\
  • %programfiles%\comet\data\
  • %programfiles%\comet\products\adzap\
  • %programfiles%\comet\products\funbutton\
  • %programfiles%\comet\products\refbutton\
  • %programfiles%\comet\products\relatedsearch\
  • %programfiles%\comet\products\shared\
  • %programfiles%\comet\products\travel\
  • %programfiles%\comet\products\webbutton\
  • %programfiles%\comet\services\
  • %programfiles%\comet\services\messaging\base\
  • %programfiles%\comet\services\messaging\campaigns\adzap\
  • %programfiles%\comet\services\messaging\listeners\
  • %programfiles%\comet\temp\
  • %programfiles%\comet\uninstall\
  • %programfiles%\comet\core\
  • %programfiles%\comet\products\funcursors\
  • %programfiles%\comet\products\webcursors\
  • %programfiles%\comet\services\addremove\
  • %programfiles%\comet\services\messaging\
  • %programfiles%\comet\
  • %programfiles%\comet systems\
  • %programfiles%\screensavers.com\installer\bin\

3. Delete the following malicious registry entries and\or values:

  • Key: CLSID\{16bc6464-196a-4bab-a14b-f69f8a0a60f7}
  • Key: CLSID\{197ab1d7-a7dd-4c86-a938-1fcc0db21b85}
  • Key: clsid\{212b99a1-9cf6-11d3-80b7-0500487bdba}
    Value: @
  • Key: clsid\{39e01e09-2b45-11d4-810d-00500487d1c5}
    Value: @
  • Key: clsid\{90c61707-c8f8-43db-a25c-c1f4b18ee41e}
  • Key: clsid\{c38fc998-3b1b-4f59-a710-5a6c9cf8bd92}
  • Key: clsid\{cd74b159-a1d3-11d3-80bc-0500487bdba}
    Value: @
  • Key: clsid\{d14d6793-9b65-11d3-80b6-00500487bdba}
  • Key: clsid\{da0882fb-49a3-4a9e-bb09-5e15347b5647}
  • Key: clsid\{e5c39db-9dcc-11d3-80d6-00500487d1c5}
    Value: @
  • Key: clsid\{edc4193f-34ad-4d07-aa87-e3fdb89e3e76}
  • Key: clsid\{f59c663d-e891-492c-86e3-0758c71885c2}
  • Key: cssecurity.htmlsecurity
  • Key: dmproxy.dmproxyctl
  • Key: dmserver.dmnotify
  • Key: interface\{1e587528-41aa-4f19-97e8-bb75acc3035c}
  • Key: interface\{2fcfb3fd-7184-4c42-aed3-30fff0119964}
  • Key: interface\{34fdd882-5530-4a90-89cd-416612c8855e}
  • Key: interface\{58c59f56-ca66-4b5d-9132-ecea5193be5a}
  • Key: interface\{665abe65-2c16-4341-b4b8-01ff799e8f4c}
  • Key: interface\{788e0d0e-caf7-473b-9183-76be6d30dc9a}
  • Key: interface\{7aa7d1c3-f0f8-460c-936d-b5886d0928eb}
  • Key: interface\{832786ec-9632-4919-8972-59f79d621c87}
  • Key: interface\{97284959-a553-4576-859c-b3b3ff283de0}
  • Key: interface\{a0ca55a1-a112-11d3-80d6-00500487b1c5}
  • Key: interface\{a4b977f5-1efc-4da0-b9c2-67c53cba140f}
  • Key: interface\{a9e67cbe-7a42-47be-962a-c07e73c34fba}
  • Key: interface\{aeb17fc4-2a52-4945-9866-81cc343a59e3}
  • Key: interface\{b0e9399e-fe6f-43b0-98d3-2f47080dde4a}
  • Key: interface\{bfcbf73b-6eb2-49c1-adca-cf0cd589b140}
  • Key: interface\{c4d86dc8-b73b-4470-9914-3dac14ee6f95}
  • Key: interface\{dc86768f-5adf-4d84-9de8-fd047b1fe8f5}
  • Key: interface\{ddd1e8ca-678d-4c9a-a472-ce9578b14dc5}
  • Key: typelib\{32ba13af-001c-456e-8825-8d53077460ac}
  • Key: typelib\{5d2d50f6-6be2-41a0-b827-1accd3e2e2f7}
  • Key: typelib\{844c39ec-7ea4-4f11-bce6-28404fd768e3}
  • Key: typelib\{878ace1b-8db0-4d75-9034-504756ad4215}
  • Key: typelib\{8fcd3b3f-6f3e-4bb2-9c37-b03b27f71857}
  • Key: software\comet systems\applications\ar
    Value: @
  • Key: software\comet systems\applications\ar\library
    Value: @
  • Key: software\comet systems\applications\ar\products
    Value: @
  • Key: software\comet systems\applications\ar\services
    Value: @
  • Key: software\comet systems\applications\ccar
    Value: @
  • Key: software\comet systems\applications\ccar\library
    Value: @
  • Key: software\comet systems\applications\ccar\products
    Value: @
  • Key: software\comet systems\applications\ccar\services
    Value: @
  • Key: software\comet systems\iebands\horizontal
    Value: @
  • Key: software\comet systems\iebands\vertical
    Value: @
  • Key: software\comet systems\products
    Value: @
  • Key: cssecurity.htmlsecurity.1
  • Key: dmproxy.dmproxyctl.1
  • Key: dmserver.dmnotify.1
  • Key: software\microsoft\windows\currentversion\explorer\browser helper objects
    \{35E78239-811E-4c3f-B37D-F339AC16C2C0}
  • Key: ScreensaversInstaller.Sinstaller.1
  • Key: ScreensaversInstaller.Sinstaller.1\CLSID
  • Key: ScreensaversInstaller.Sinstaller
  • Key: ScreensaversInstaller.Sinstaller\CLSID
  • Key: ScreensaversInstaller.Sinstaller\CurVer
  • Key: CLSID\{88D758A3-D33B-45FD-91E3-67749B4057FA}
  • Key: CLSID\{88D758A3-D33B-45FD-91E3-67749B4057FA}\ProgID
  • Key: CLSID\{88D758A3-D33B-45FD-91E3-67749B4057FA}\VersionIndependentProgID
  • Key: CLSID\{88D758A3-D33B-45FD-91E3-67749B4057FA}\InprocServer32
  • Key: CLSID\{88D758A3-D33B-45FD-91E3-67749B4057FA}\TypeLib
  • Key: ScreensaversInstaller.Installer.1
  • Key: ScreensaversInstaller.Installer.1\CLSID
  • Key: ScreensaversInstaller.Installer
  • Key: ScreensaversInstaller.Installer\CLSID
  • Key: ScreensaversInstaller.Installer\CurVer
  • Key: Software\Microsoft\Code Store Database\Distribution Units\{88D758A3-D33B-45FD-91E3-67749B4057FA}
    \InstalledVersion
  • Key: CLSID\{722D2939-A14A-41A9-9EAC-AB8F4E295819}
  • Key: CLSID\{722D2939-A14A-41A9-9EAC-AB8F4E295819}\ProgID
  • Key: CLSID\{722D2939-A14A-41A9-9EAC-AB8F4E295819}\VersionIndependentProgID
  • Key: CLSID\{722D2939-A14A-41A9-9EAC-AB8F4E295819}\InprocServer32
  • Key: CLSID\{722D2939-A14A-41A9-9EAC-AB8F4E295819}\TypeLib
  • Key:
    Software\Microsoft\Windows\CurrentVersion\Uninstall\ScreensaversInstaller

    Value: DisplayName
  • Key:
    Software\Microsoft\Windows\CurrentVersion\Uninstall\ScreensaversInstaller

    Value: UninstallString
  • Key:
    Software\Microsoft\Code Store Database\Distribution Units\{88D758A3-D33B-45FD-91E3-67749B4057FA}

    Value: SystemComponent
  • Key:
    Software\Microsoft\Code Store Database\Distribution Units\{88D758A3-D33B-45FD-91E3-67749B4057FA}

    Value: Installer
  • Key: Software\Microsoft\Code Store Database\Distribution Units\{88D758A3-D33B-45FD-91E3-67749B4057FA}
    \DownloadInformation

    Value: CODEBASE
  • Key: Software\Microsoft\Code Store Database\Distribution Units\{88D758A3-D33B-45FD-91E3-67749B4057FA}
    \DownloadInformation

    Value: INF
  • Key: Software\Screensavers.com\Installer\Tokens
    Value: COMET
  • Key: Software\Screensavers.com\Installer\Tokens
    Value: WINDOWS
  • Key: Software\Screensavers.com\Installer\Settings
    Value: rangeSize
  • Key: Software\Screensavers.com\Installer\Settings
    Value: secNextRangeInterval
  • Key: Software\Screensavers.com\Installer\Settings
    Value: tValidHistoryPeriod
  • Key: Software\Screensavers.com\Installer\Settings
    Value: tActiveJobPurgePeriod
  • Key: Software\Screensavers.com\Installer\Settings
    Value: tTempFilePurgePeriod
  • Key: Software\Screensavers.com\Installer\Settings
    Value: prMaxLoad

Warning: if value is listed for some registry entries, you should only clear these values and leave keys with such values untouched. We recommend you to use WiperSoft Antispyware Malware Remediation Tool for safe problem solution.


Uninstall Comet Systems related programs from Control Panel

We recommend you to check list of installed programs and search for Comet Systems entry or other unknown and suspicious programs. Below are instructions for different version if Windows. In some cases adware programs are protected by malicious service or process and it will not allow you to uninstall it. If Comet Systems won't uninstall or gives you error message that you do not have sufficient rights to do this perform below instructions in Safe Mode or Safe Mode with Networking or use WiperSoft Antispyware Malware Remediation Tool.


Windows 10

  • Click on the Start menu and choose Settings
  • Then click on System and choose Apps & Features in the left column
  • Find Comet Systems under in the list and click Uninstall button near it.
  • Confirm by clicking Uninstall button in opened window if necessary.

Windows 8/8.1

  • Right click on the bottom left corner of the screen (while on your desktop)
  • In the menu choose Control Panel
  • Click Uninstall a program under Programs and Features.
  • Locate programs that can be connected with Comet Systems or other related suspicious program.
  • Click Uninstall button.
  • Wait until uninstall process is complete.

Windows 7/Vista

  • Click Start and choose Control Panel.
  • Choose Programs and Features and Uninstall a program.
  • In the list of installed programs find entries related to Comet Systems
  • Click Uninstall button.

Windows XP

  • Click Start
  • In the menu choose Control Panel
  • Choose Add / Remove Programs.
  • Find Comet Systems related entries.
  • Click Remove button.

Remove Comet Systems related extensions from your browsers

Comet Systems in some cases can be accompanied with browsers extension. We recommend you to use free option Toolbar Remover under Tools in Spyhunter Remediation Tool to remove unwanted browser extensions related to Comet Systems. We recommend you to perform scan your PC with Removal Tool or Spyhunter Remediation Tool. To remove extenions from your browsers manually do the following:

Internet Explorer

  • While in Internet Explorer click cogwheel icon in the top right corner
  • In the menu choose the Manage Add-ons
  • Select Toolbar and Extension tab.
  • Choose add-on possibly related to Comet Systems or other related adware BHO.
  • Click Disable button.

Warning: This option will only disable unwanted plugin. For effective Comet Systems removal use WiperSoft Antispyware Malware Remediation Tool.

Google Chrome

  • Start Google Chrome.
  • In the address bar type chrome://extensions/
  • In the list of add-ons find related to Comet Systems and click recycle bin icon.
  • Confirm Comet Systems removal.

Mozilla Firefox

  • Open Firefox
  • In the address bar type about:addons
  • Click Extensions tab.
  • In the list of extension locate ones related to Comet Systems.
  • Click Remove button near it.

Reset browsers search and homepage settings

Comet Systems can affect your browsers which results in browser redirection or search hijack. We recommend you to use free option Reset Browsers under Tools in Spyhunter Remediation Tool to reset all the browsers at once. Mention that you need to remove all files and kill all processes belonging to Comet Systems before doing this. To reset your browsers manually and restore your homepage perform the following steps:

Internet Explorer

  • If you use Windows XP, click Start, and then click Run. Type the following in the Open box without quotes, and press Enter: "inetcpl.cpl"
  • If you use Windows 7 or Windows Vista, click Start. Type the following in the Search box without quotes, and press Enter: "inetcpl.cpl"
  • Click the Advanced tab
  • In Reset Internet Explorer settings, click Reset. Click Reset in opened window again.
  • Select Delete personal settings checkbox to remove browsing history, search providers, homepage
  • After Internet Explorer finishes resetting, click Close in the Reset Internet Explorer Settings dialog box

Warning: In case this option will not work use free option Reset Browsers under Tools in Spyhunter Remediation Tool.

Google Chrome

  • Go to the installation folder of Google Chrome: C:\Users\"your username"\AppData\Local\Google\Chrome\Application\User Data.
  • In the User Data folder, look for a file named as Default and rename it to DefaultBackup.
  • Launch Google Chrome and a new clean Default file will be created.

Warning: This option might not work if in Google Chrome you use online synchronization between PCs. In this case use free option Reset Browsers under Tools in Spyhunter Remediation Tool.

Mozilla Firefox

  • Open Firefox

  • Go to Help > Troubleshooting Information in menu.
  • Click the Reset Firefox button.
  • After Firefox is done, it will show a window and create folder on the desktop. Click Finish.

Warning: This option will also clean all your account passwords for all websites. If you don't want it use free option Reset Browsers under Tools in Spyhunter Remediation Tool.


Here are the descriptions of problems connected with Comet Systems and siuninst.exe we received earlier:

Problem Summary: Windows 2000 servers rebooting

All Windows 2000 with SP4 servers are rebooting without any thing in the logs except that the last shutdown was unexpected

Problem was successfully solved. Ticket was closed.

Problem in focus: mydoom worm

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