User Evasion
Where this stands
No Sigma rule can address this — the telemetry MITRE names has no Sigma logsource behind it.
Sigma has no logsource taxonomy for mobile platforms. MITRE's telemetry here is mobile EDR and device APIs, which no Sigma rule can address.
What the technique is
Adversaries may attempt to avoid detection by hiding malicious behavior from the user. By doing this, an adversary’s modifications would most likely remain installed on the device for longer, allowing the adversary to continue to operate on that device. While there are many ways this can be accomplished, one method is by using the device’s sensors. By utilizing the various motion sensors on a device, such as accelerometer or gyroscope, an application could detect that the device is being interacted with. That way, the application could continue to run while the device is not in use but cease operating while the user is using the device, hiding anything that would indicate malicious activity was ongoing. Accessing the sensors in this way does not require any permissions from the user, so it would be completely transparent.
Read it on attack.mitre.orgWhat MITRE says you would watch
- AN1815
Correlates (1) continuous or repeated use of motion or interaction-inference signals that do not require overt user-facing privilege prompts, (2) suppression of higher-risk behavior while user presence or active handling is inferred, and (3) resumption of background execution, sensor use, local data handling, or network activity only when device interaction falls below a threshold. The defender observes a causal chain where an application senses user/device interaction state and intentionally gates malicious behavior to user-inactive periods.
Technique names and descriptions © MITRE ATT&CK®, CC BY 4.0. Not endorsed by MITRE.