- Downloads which a person authorised but without understanding the consequences (e.g. downloads which install an unknown or counterfeit executable program, ActiveX component, or Java applet) automatically.
- Any download that happens without a person's knowledge, often a computer virus, spyware, malware, or crimeware.
Drive-by downloads may happen when visiting a website, viewing an e-mail message or by clicking on a deceptive pop-up window: by clicking on the window in the mistaken belief that, for example, an error report from the computer's operating system itself is being acknowledged or a seemingly innocuous advertisement pop-up is being dismissed. In such cases, the "supplier" may claim that the user "consented" to the download, although the user was in fact unaware of having started an unwanted or malicious software download. Websites that exploited the Windows Metafile vulnerability (eliminated by a Windows update of 5 January 2006) may provide examples of drive-by downloads of this sort.
A drive-by install (or installation) is a similar event. It refers to installation rather than download (though sometimes the two terms are used interchangeably).
- "Exploit on Amnesty pages tricks AV software". The H online. Heinz Heise. 20 April 2011. Retrieved 8 January 2011.
- Olsen, Stefanie (8 April 2002). "Web surfers brace for pop-up downloads". CNET News. Retrieved 28 October 2010.
- Holz, Thorsten (5 August 2010). "CSI:Internet - Episode 1". The H online. Heinz Heise (13/2010). Retrieved 21 May 2015.
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