Drive-by downloads

Drive-by download means two things, each concerning the unintended download of computer software from the Internet:

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. Similarly if a person is visiting a site with malicious content, the person may become victim to a drive-by download attack. That is, the malicious content may be able to exploit vulnerabilities in the browser or plugins to run malicious code without the user’s knowledge.

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).

When creating a drive-by download, an attacker must first create their malicious content to perform the attack. With the rise in exploit packs that contain the vulnerabilities needed to carry out drive-by download attacks, the skill level needed to perform this attack has been reduced.

The next step is to host the malicious content that the attacker wishes to distribute. One option is for the attacker to host the malicious content on their own server. However, because of the difficulty in directing users to a new page, it may also be hosted on a compromised legitimate website, or a legitimate website unknowingly distributing the attackers content through a third party service (e.g. an advertisement). When the content is loaded by the client, the attacker will analyze the fingerprint of the client in order to tailor the code to exploit vulnerabilities specific to that client.

Finally, the attacker exploits the necessary vulnerabilities to launch the drive-by download attack. Generally, drive-by downloads use two strategies. The first strategy is exploiting API calls for various plugins. For example, the DownloadAndInstall API of the Sina ActiveX component did not properly check its parameters and allowed the downloading and execution of arbitrary files from the internet. The second strategy involves writing shellcode to memory, and then exploiting vulnerabilities in the web browser or plugin to divert the control flow of the program to the shell code. After the shellcode has been executed, the attacker has the ability to perform further malicious activities. This could include stealing information to send back to the attacker, but generally involves downloading and installing malware.

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Wikipedia