Malware researchers discover a new malicious campaign for Android devices that replaces legitimate apps with tainted copies built to push advertisements or hijack valid ad events. Agent Smith was observed lurking in popular third-party app stores such as 9Apps, which serves users mostly Indian, Arabic, and Indonesian users. The largest number of infected devices were in India (over 15 million), followed by Bangladesh (over 2.5 million) and Pakistan (almost 1.7 million) Infections were also seen on devices in Saudi Arabia (245k), Australia (141k), the U.K. (137k) and U.S. (303k)
Source: https://www.bleepingcomputer.com/news/security/25-million-android-devices-infected-by-agent-smith-malware/