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The RottenSys botnet is already composed of nearly 5 million Android devices

RottenSys – A Chinese crime ring is building a huge botnet that is already composed of nearly 5 million Android device.

Researchers at Check Point discovered attackers infecting the device with a strain of malwaredubbed RottenSys thataggressively display ads on victims’ devices.

“The Check Point Mobile Security Team has discovered a new widespread malware family targeting nearly 5 million users for fraudulent ad-revenues. They have named it ‘RottenSys’ for in the sample we encountered it was initially disguised as a System Wi-Fi service.” reads the analysis ofCheck Point.

The experts started the investigation after findingan unusual self-proclaimed system Wi-Fi service (系统WIFI服务) on a Xiaomi Redmi phone. The researchers discovered the service does not provide any secure Wi-Fi, instead, it asks for many Android permissions.

TheRottenSys malware implements two evasion techniques:

  • The first technique consists of postponing operations for a set time.
  • The second technique uses a...(continued)
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