Older versions of Android contained various vulnerabilities that allowed gaining root access to the device. Many malicious programs exploited these to elevate their system privileges and gain persistence. The notorious Triada Trojan also used this attack vector. With time, the vulnerabilities were patched, and restrictions were added to the firmware. Specifically, system partitions in recent Android versions cannot be edited, even with superuser privileges. Ironically, this has inadvertently benefited malicious actors.
While external malware now faces greater permission restrictions, pre-installed malware within system partitions has become impossible to remove. Attackers are leveraging this by embedding malicious software into Android device firmware. This is how one of Kaspersky earlier findings, the Dwphon loader, functioned. It was built into system apps for over-the-air (OTA) updates. In March 2025, Kaspersky research highlighted the Triada Trojan’s evolved tactics to overcome Android’s enhanced privilege restrictions.
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Source: Kaspersky
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