How Android Fought the Chamois Botnet—and Won

guest · Apr 9, 2019

How Android Fought an Epic Botnet—and Won
April 9, 2019
https://www.wired.com/story/google-android-chamois-botnet/

In March 2017, the Android security team was feeling pleased with itself. The group had detected, analyzed, and neutralized a sophisticated botnet built on tainted apps that all worked together to power ad and SMS fraud.

Eight months later in November 2017, though, Chamois roared back into the Android ecosystem, more ferocious than before. [...] The Chamois developers also fingerprinted our exact Android security analysis environment and built in protections for some of the customizations that we use."
Back With a Vengeance
After the March 2018 infection peak, the Android security team started collaborating with other defenders across Google, like anti-abuse and ad security specialists and software engineers, to get a handle on the new version of Chamois.
[...]
Google now uses a combination of detection methods to police Chamois, including signature-based flags, machine learning assessment, and behavioral analytics. The team also does monthly and quarterly check-ins on all Chamois stats so they’ll be able to quickly halt any new momentum the botnet gains.
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