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Removal instructions for DnsIo

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What is DnsIo?

The Malwarebytes research team has determined that DnsIo is adware. These adware applications display advertisements not originating from the sites you are browsing.

This one is a DNS hijacker.

How do I know if my computer is affected by DnsIo?

You may see this Scheduled Task:


and this warning during install:


How did DnsIo get on my computer?

Adware applications use different methods for distributing themselves. This particular one was bundled with other software.

How do I remove DnsIo?

Our program Malwarebytes Anti-Malware can detect and remove this potentially unwanted program.

  • Please download Malwarebytes Anti-Malware to your desktop.
  • Double-click mbam-setup-version.exe and follow the prompts to install the program.
  • At the end, be sure a check-mark is placed next to the following:
    • Enable free trial of Malwarebytes Anti-Malware Premium
    • Launch Malwarebytes Anti-Malware
  • Then click Finish.
  • If an update is found, you will be prompted to download and install the latest version.
  • Once the program has loaded, select Scan now. Or select the Threat Scan from the Scan menu.
  • When the scan is complete , make sure that everything is set to "Quarantine", and click Apply Actions.
  • Reboot your computer if prompted.
Is there anything else I need to do to get rid of DnsIo?
  • No, Malwarebytes' Anti-Malware removes DnsIo completely.
How would the full version of Malwarebytes Anti-Malware help protect me?

We hope our application and this guide have helped you eradicate this adware application.

As you can see below the full version of Malwarebytes Anti-Malware would have protected you against the DnsIo adware. It would have warned you before the application could install itself, giving you a chance to stop it before it became too late.


Technical details for experts

You will see these signs in a HijackThis log:

O17 - HKLM\System\CCS\Services\Tcpip\..\{45B09BD0-96AE-417A-BE38-54811B4E2126}: NameServer =, - HKLM\System\CS1\Services\Tcpip\..\{45B09BD0-96AE-417A-BE38-54811B4E2126}: NameServer =,
You may see these signs in FRST logs:

 Tcpip\..\Interfaces\{45B09BD0-96AE-417A-BE38-54811B4E2126}: [NameServer], Tcpip\..\Interfaces\{45B09BD0-96AE-417A-BE38-54811B4E2126}: [DhcpNameServer] C:\Windows\System32\Tasks\DnsIo C:\Program Files (x86)\DnsIoTask: {78EC7742-80A4-442F-9C5D-C85ECFC0B8A9} - System32\Tasks\DnsIo => C:\Program Files (x86)\DnsIo\DnsIo.exe
Alterations made by the installer:

File system details [View: All details] (Selection)---------------------------------------------------    Adds the folder C:\Program Files (x86)\DnsIo    In the existing folder C:\Windows\System32\Tasks       Adds the file DnsIo"="29/09/2015 09:05, 4724 bytes, ARegistry details [View: All details] (Selection)------------------------------------------------    [HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{FCE1662E-06F1-413D-80CB-33D456D1CFCB}]       "prod"="REG_SZ", "DnsIo"    [HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\DnsIo]       "cid"="REG_SZ", "1a79850a33bc499daf390869bce95cc4"    [HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\DNSUtils]       "{45B09BD0-96AE-417A-BE38-54811B4E2126}"="REG_SZ", ""       "installCode"="REG_SZ", "61"       "ti"="REG_SZ", "20150929"    [HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\SmartDNS]    [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\Tcpip\Parameters\Interfaces\{45B09BD0-96AE-417A-BE38-54811B4E2126}]       "NameServer"=REG_SZ, ","
Malwarebytes Anti-Malware log:

Malwarebytes Anti-Malwarewww.malwarebytes.orgScan Date: 29/09/2015Scan Time: 09:20Logfile: mbamDNSIO.txtAdministrator: YesVersion: Database: v2015.09.29.02Rootkit Database: v2015.09.22.01License: PremiumMalware Protection: DisabledMalicious Website Protection: EnabledSelf-protection: DisabledOS: Windows 7 Service Pack 1CPU: x64File System: NTFSUser: {username}Scan Type: Threat ScanResult: CompletedObjects Scanned: 334312Time Elapsed: 4 min, 19 secMemory: EnabledStartup: EnabledFilesystem: EnabledArchives: EnabledRootkits: EnabledHeuristics: EnabledPUP: EnabledPUM: EnabledProcesses: 0(No malicious items detected)Modules: 0(No malicious items detected)Registry Keys: 4PUP.Optional.WebWatcher, HKLM\SOFTWARE\WOW6432NODE\CLASSES\CLSID\{FCE1662E-06F1-413D-80CB-33D456D1CFCB}, Quarantined, [f8aed263bfcc40f6519632c1857d6e92], PUP.Optional.WebWatcher, HKLM\SOFTWARE\CLASSES\WOW6432NODE\CLSID\{FCE1662E-06F1-413D-80CB-33D456D1CFCB}, Quarantined, [f8aed263bfcc40f6519632c1857d6e92], PUP.Optional.CloudScout.BrwsrFlsh, HKLM\SOFTWARE\MICROSOFT\WINDOWS NT\CURRENTVERSION\SCHEDULE\TASKCACHE\TREE\DnsIo, Delete-on-Reboot, [4c5a7abbff8cf83ea6ef2ab10ef6728e], Trojan.DNSio, HKLM\SOFTWARE\WOW6432NODE\DnsIo, Quarantined, [079f61d41f6c49ed89ec4199ec18e41c], Registry Values: 0(No malicious items detected)Registry Data: 1Trojan.DNSChanger, HKLM\SYSTEM\CURRENTCONTROLSET\SERVICES\TCPIP\PARAMETERS\Interfaces\{45B09BD0-96AE-417A-BE38-54811B4E2126}|NameServer,,, Good: (), Bad: (,,Replaced,[5056d95c612adb5bb1035f21ce37cf31]Folders: 1PUP.Optional.CloudScout.BrwsrFlsh, C:\Program Files (x86)\DnsIo, Quarantined, [05a16bcacac195a1c750d166fc07dd23], Files: 2PUP.Optional.CloudScout, C:\Users\{username}\Desktop\dnsio-setup-dnsiosomo1.exe, Quarantined, [683e7fb6d9b24cea3ec2bdb549bcca36], PUP.Optional.CloudScout.BrwsrFlsh, C:\Windows\System32\Tasks\DnsIo, Quarantined, [c4e284b1791246f0fc976a7102020000], Physical Sectors: 0(No malicious items detected)(end)
As mentioned before the full version of Malwarebytes Anti-Malware could have protected your computer against this threat.

We use different ways of protecting your computer(s):

  • Dynamically Blocks Malware Sites & Servers
  • Malware Execution Prevention
Save yourself the hassle and get protected.
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