Password reset by itself and Russian language, Optus 4G Huawei e5573

[Ben19842018]

A virus acting like in the description is on samsung K2 that connect to my internet and directly slow it down to almost 0...

I already check with Avast, Malwarebytes and Bitdefender but they find nothing...On my computer Malwarebytes found it: 

PUP optional driver plus, I think...

Have you eard about this virus and how to delete it from Android?

[10000000000GB]

PUP is not really an aggressive warning of malware.

You can reset the modem using the reset button next to the battery. Means entering the passwords and SSID again. Keep the phone away from it, until it looks steady.