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OpenCandy is an "adware" module designed to install on a personal computer during software installation. Produced by SweetLabs, it consists of a Microsoft Windows library incorporated in a Windows Installer. When a user installs an application that has bundled the OpenCandy library, an option appears to install software it recommends based on a scan of the user's system and geolocation. Both the option and offers it generates are selected by default if the user simply clicks [Next] through the installation.[1][2]

OpenCandy's various undesirable side-effects include changing your homepage, desktop background or search provider, and inserting unwanted toolbars or plug-in/extension add-ons in your browser. It also collects and transmits various information about the user and his surfing habits to third parties without notification or consent.

It has been reported that a number of anti-virus vendors flag OpenCandy as malware.[3]


The software was originally developed for the DivX installation, by CEO Darrius Thompson. When installing DivX, the user was prompted to optionally install the Yahoo! Toolbar. DivX received $15.7 million during the first nine months of 2008 from Yahoo and other software developers, after 250 million downloads.[2]

Chester Ng, the former DivX business development director, is chief business officer and Mark Chweh, former DivX engineering director, is chief technology officer.[2]

Windows components[edit]

Components of the program may have differing but similar names based on version.

Files dropped[edit]

Note that files dropped by this program usually have the 'hidden' and 'system' attributes set. In order to see or search for them, folder settings for "hide operating system files" will need to be unchecked, and "show hidden files and folders" will need to be checked.

  • OCSetupHlp.dll


Note: additional processes associated with any accepted offers may also run.

  • spidentifier.exe
  • rundll32.exe

Registry keys[edit]

Registry keys have varying names, so that a search of the registry for "*opencandy*" will need to be done to find and delete them.

DNS and HTTP queries[edit]


Counter measures[edit]

  • Block opencandy ip addresses in Windows host file with entries like:

  • execute software installers from command line with option /NOCANDY
  • use an active anti-virus to detect and block adware/malware on-the-fly

Software download sites known to host OpenCandy infected software[edit]

In addition to individual company/vendor sites distributing their own freeware/shareware, commercial depository type download sites also host OpenCandy infected software.

  • Brothersoft
  • CNET
  • Softpedia
  • SourceForge
  • Softonic
  • μTorrent

Applications known to use or have used OpenCandy[edit]


  1. ^ Needleman, Rafe (11 November 2008), OpenCandy brings ad market to software installs. What?, CNET news, retrieved 2009-08-18 
  2. ^ a b c Marshall, Matt (10 November 2008), OpenCandy inserts recommendations when you install software, retrieved 2009-08-18 
  3. ^ Van der Sar, Ernesto (21 July 2015). "uTorrent Flagged As 'Harmful' by Anti-Virus Companies and Google". TorrentFreak. Retrieved 19 August 2015. The anti-virus scans associate the uTorrent.exe file with Trojan.Win32.Generic!BT and the controversial OpenCandy bundling software. While this isn’t the first time that uTorrent has been flagged in this manner, we haven’t seen it being reported by this many independent tests before. [followed by an image showing open candy being flagged in utorrent on virus total] 
  4. ^ [1]
  5. ^ [2](Click More download options)
  6. ^ [3] Multiple Packages available
  7. ^ End User License Agreement, retrieved September 2014
  8. ^ Foxit Forum
  9. ^ FreeFileSync FAQ
  10. ^ "Change log". ImgBurn. LIGHTNING UK!. 2013-06-16. Archived from the original on 2014-08-08. Retrieved 2014-08-30. Changed: No longer bundling/offering the toolbar in the setup program, OpenCandy now handles product offerings during installation. 
  11. ^
  12. ^ a b c gizmo, richards (2014-02-08). "Controversial Advertising Program Now Being Embedded in More Software". Gizmo's Freeware. Archived from the original on 2014-08-07. Retrieved 2014-08-30. OpenCandy (OC) is a relatively new advertising product that more and more software developers are bundling with their programs. It can now be found in the installers of dozens of popular programs including IZArc, mirC, PrimoPDF, Trillian Astra and more. 
  13. ^
  14. ^ [4] On the Help/Facts page
  15. ^ Discussions on pdfforge Forums
  16. ^ Schember, John (21 January 2012). "Sigil 0.5.0 Released". Retrieved 2012-03-17. 
  17. ^ "WinSCP - OpenCandy". Retrieved 2014-04-03.