Google Online Security Blog: New research: Zeroing in on deceptive software installations

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New research: Zeroing in on deceptive software installations

2016年8月4日

Posted by Kurt Thomas, Research Scientist and Juan A. Elices Crespo, Software Engineerprotect users from unwanted softwareunwanted ad injectorsbrowser settings hijackersNYU Tandon School of Engineeringread hereUSENIX Security SymposiumBehind the scenes of unwanted software distribution

Software bundle installation dialogue. Accepting the express install option will cause eight other programs to be installed with no indication of each program’s functionality.

Advertisers: In pay-per-install lingo, advertisers are software developers, including unwanted software developers, paying for installs via bundling. In our example above, these advertisers include Plus-HD and Vuupc among others. The cost per install ranges anywhere from $0.10 in South America to $1.50 in the United States. Unwanted software developers will recoup this loss via ad injection, selling search traffic, or levying subscription fees. During our investigation, we identified 1,211 advertisers paying for installs.

Affiliate networks: Affiliate networks serve as middlemen between advertisers looking to buy installs and popular software packages willing to bundle additional applications in return for a fee. These affiliate networks provide the core technology for tracking successful installs and billing. Additionally, they provide tools that attempt to thwart Google Safe Browsing or anti-virus detection. We spotted at least 50 affiliate networks fueling this business.

Publishers: Finally, popular software applications re-package their binaries to include several advertiser offers. Publishers are then responsible for getting users to download and install their software through whatever means possible: download portals, organic page traffic, or often times deceptive ads. Our study uncovered 2,518 publishers distributing through 191,372 webpages.

This decentralized model encourages advertisers to focus solely on monetizing users upon installation and for publishers to maximize conversion, irrespective of the final user experience. It takes only one bad actor anywhere in the distribution chain for unwanted installs to manifest.

What gets bundled?
We monitored the offers bundled by four of the largest pay-per-install affiliate networks on a daily basis for over a year. In total, we collected 446K offers related to 843 unique software packages. The most commonly bundled software included unwanted ad injectors, browser settings hijackers, and scareware purporting to fix urgent issues with a victim’s machine for $30-40. Here’s an example of an ad injector impersonating an anti-virus alert to scam users into fixing non-existent system issues:

Deceptive practices
Taken as a whole, we found 59% of weekly offers bundled by pay-per-install affiliate networks were flagged by at least one anti-virus engine as potentially unwanted. In response, software bundles will first fingerprint a user’s machine prior to installation to detect the presence of “hostile” anti-virus engines. Furthermore, in response to protections provide by Google Safe Browsing, publishers have resorted to increasingly convoluted tactics to try and avoid detection, like the defunct technique shown below of password protecting compressed binaries:

Paired with deceptive promotional tools like fake video codecs, software updates, or misrepresented brands, there are a multitude of deceptive behaviors currently pervasive to software bundling.

Cleaning up the ecosystem
We are constantly improving Google Safe Browsing defenses and the Chrome Cleanup Tool to protect users from unwanted software installs. When it comes to our ads policy, we take quick action to block and remove advertisers who misrepresent downloads or distribute software that violates Google’s unwanted software policy.
Additionally, Google is pushing for real change from businesses involved in the pay-per-install market to address the deceptive practices of some participants. As part of this, Google recently hosted a Clean Software Summit bringing together members of the anti-virus industry, bundling platforms, and the Clean Software Alliance. Together, we laid the groundwork for an industry-wide initiative to provide users with clear choices when installing software and to block deceptive actors pushing unwanted installs. We continue to advocate on behalf of users to ensure they remain safe while downloading software online.

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