OpenCandy

OpenCandy was an adware module and a potentially unwanted program classified as malware by many anti-virus vendors. They flagged OpenCandy due to its undesirable side-effects. It was designed to run during installation of other desired software. Produced by SweetLabs, it consisted of a Microsoft Windows library incorporated in a Windows Installer. When a user installed an application that had bundled the OpenCandy library, an option appeared to install software it recommended based on a scan of the user's system and geolocation. Both the option and offers it generated were selected by default and would be installed unless the user unchecked them before continuing with the installation.

OpenCandy's various undesirable side-effects included, changing the user's homepage, desktop background or search provider, inserting unwanted toolbars, plug-ins and extension add-ons in the browser. It also collected and transmitted various information about the user and their Web usage without notification or consent. After massive criticism of the software occurred, it was eventually discontinued in August of 2016.

Development
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 2007 from Yahoo and other software developers, after 250 million downloads.

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

Windows components
Components that the program used may have differed but here are some similar names based on versions of the software.

Files dropped

 * OCComSDK.dll
 * OCSetupHlp.dll
 * Fusion.dll

Processes

 * spidentifier.exe
 * rundll32.exe

DNS and HTTP queries

 * tracking.opencandy.com.s3.amazonaws.com
 * media.opencandy.com (website not available)
 * cdn.opencandy.com
 * cdn.putono5.com
 * tracking.opencandy.com
 * api.opencandy.com
 * www.arcadefrontier.com

Software known to have included OpenCandy

 * AC3Filter
 * Auslogics Disk Defrag
 * CamStudio (since version 2.7 r316)
 * CDBurnerXP (depending on version; alternate download without OpenCandy available; confirmed 2017-03-01)
 * FileZilla (present in 2013)
 * Format Factory
 * Foxit Reader (6.1.4 – 6.2.1)
 * FreeFileSync
 * FrostWire
 * GOM Player
 * ImgBurn (since version 2.5.8.0, though only on the version of the installer distributed directly from imgburn.com; the version distributed from the official mirror sites is adware-free)
 * mIRC
 * MP3 Rocket
 * Orbit Downloader (confirmed 2015-10-24)
 * PDFCreator
 * PhotoScape
 * PrimoPDF
 * Sigil (dropped in version 0.5.0 and later)
 * Trillian (dropped 5 May 2011)
 * μTorrent
 * WinSCP (through August 2012)
 * FL Studio Installer

Workarounds
There were workarounds to bypass OpenCandy by running some installers with a  parameter on the command line, which was up to the installer to support or not.