There are still users with old Android devices and if you are one of them, then it’s time to switch to a new device. According to Avast Anti virus, they claim that there are 100 Android models that has this pre-installed malicious program named “Cosiloon” that might harm your device or can hack your personal data.
This Malicious program Cosilioon is nothing but a pop-up advertisement that forces you to download an application. This malicious program are seen in cheap devices from ZTE, Archos, and myPhone. This is reported that the activity is done only on selected countries, but there is no detail on which countries. This program is found running in more than 90 countries.
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So if you have every downloaded any app through the pop-up ads, then i believe that you need to change your system as there are chances that you might have got effected.