I'm facing the same problem !
I have Panasonic Eluga A3 pro (it's been 4+ years now).
Everything was going superfine until last week of November !
At first my WhatsApp got banned ! Then I understood that unknown ppl were getting messages from my number (which I never sent them) about returning some loan. Then I was getting some group invitation message from international numbers (those messages were getting vanished within a second from screen). I thought someone might have hacked my WhatsApp so I went to cyber cell to file a complaint but they thought i might have clicked any unknown link etc. And asked me ignore this matter.
Also some unknown apps were getting installed without my knowledge ! Like BBQ browser, and app related to bitcoin !(I'm not into crypto currency... God knows this was happening ). So in the end to get rid of all this I formated my Android (factory reset). Then I created new Gmail account using new mobile number and registered WhatsApp with this new number. But again my WhatsApp got banned ! Bcz I was still getting messages from international numbers !
So I deleted that WhatsApp account also !
And again unknown apps started getting installed without my knowledge..I tried to uninstall them but they used to reappear after some time !
Apps like Color go go , BBQ browser, jumper , Snapchat (I'm not on Snapchat but my Google history showed that I tried to buy that app
)Also this wqbd was getting installed again and again !
So I again tried to reset my phone !
And this time also...my phone was alright for one day but again this wqbd got installed !
Now I haven't registered to WhatsApp bcz I finally understood no matter how many times I would create new Gmail account from new sim card ...there is some problem in mobile system !
Someone has shared a link in thread related to wqbd problem...which says Panasonic has been facing data breaching !
I finally felt some relief that my efforts of net surfing since last one month finally landed me to this page !
Here I came to know that...I am not the only one facing all these issues...there are other folks also... having Panasonic mobile phone !
Till now everyone was blaming me that I must have clicked wrong link or shared OTP etc but now after reading that article about data breaching I finally understood it's not my fault but it's the mobile system which is responsible!!
Sorry for this long thread ! But I wanted to share all the problems for those who were asking for details about wqbd.
I tried to install malware bytes but it's of no use ...bcz Even if you uninstall the infected folder (in my case it was updater it's symbol was clouds in Blue Color) it reappears after some time !
Then I tried No root firewall ...it also can't protect ur phone totally... though u can see what's happening in the background of ur phone but still some apps (BBQ, Snapchat,w wqbd,color gogo and some gaming apps) are getting installed .
By reading some comments on this page .....I finally understood that..as of now there is no other alternative than shifting to another mobile phone of different brand
I bought Panasonic 4 yrs before...bcz we liked it's battery backup and many other features ! But now I have to opt for a new device !!