Stubborn Trojan Killer for Android

Scans Android system partitions to locate and purge trojans that persist after standard cleanups, using focused detection and cleanup workflows. Stubborn Trojan Killer, from Cheetah Mobile, is an Android utility aimed at system-level malware removal, offering one-tap detection, cloud-based signatures, and a lightweight runtime footprint. It fits users dealing with persistent ROM infections or who install apps from untrusted third-party sources, especially those comfortable with low-level device maintenance. The app avoids bundled booster tools and stays narrowly focused on its security task.

Targets trojans that acquire root and embed in device ROM

The tool supplies specialized removal routines for several named families, including Ghost Push, Roonik, and Hummer. Those families are described as gaining elevated privileges to place components in the system area, which standard scanners often cannot modify. The app implements signature checks for those families and tailored cleanup steps that act on the infection's footprint rather than on generic user-space traces.

Operates at low system level and demands careful handling

The developer states the app needs elevated permissions to change files outside user storage, so full remediation requires granting the tool access to protected areas. Because it can alter the system partition, the workflow changes files that regular applications can't touch; that capability makes the operation effective on entrenched threats, and it also increases operational risk, so backing up device state before major changes is advisable.

Deliberately narrow scope, not a substitute for general antivirus

The app focuses on a single class of persistent infections rather than offering a broad security suite. That narrow approach removes unrelated utilities such as boosters or generic cleaners and makes the interface purpose-built for malware removal. The developer positions the tool for Android owners who routinely install from third-party sources and who need a specialist utility rather than a general endpoint scanner.

Useful for experienced maintainers, but trust and distribution are trade-offs

This tool is a practical specialist for technically competent users who must remove system-embedded trojans, provided they accept reputational and distribution trade-offs tied to the developer. The developer's suite was removed from the Google Play Store in 2020 after allegations of ad fraud and privacy violations, and public sentiment shifted from narrow praise to mixed or negative. Recommended for experienced maintainers only.