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Most common reason people get accounts hijack for any service really are as followed.
- Sharing account infomation with others. <--- Very common with impersonators, pretending to be Steam admin / support.
- Logging in on phishing sites. <--- Very common scam.
- Downloading / Installing Virus / Keylogger on your system.
- Using public devices that has keyloggers, such as cyber cafe, school computers, and etc...
- Storing your login credentials on a unsecured service that others has access to view.
- Using same login credentials for all your things, or using same login credentials on another service that had a data leak. Yes it does matter because even if it not related to Steam, if using same login credentials, hijackers will try to use those credentials to see what services you use with those credentials. https://haveibeenpwned.com/
https://youtu.be/9TRR6lHviQc
I have to metion the notification is NOT FROM steam, even closing it or turning internet off it still made appear the Notification (even if still randomly).
If you do the nuke.
1. You be using your OS installer via disk, or usb thumb drive you have. Do not make OS IOS copy on infected PC, if you need to download a copy of your OS, and make IOS, do it on a clean PC.
2. Giving you two option how far you wanna go if you wanna ease your paranoia.
A) On infected PC make sure it off, unplug power for minute, then plug back in, plug in your USB thumb drive, power on PC, and then smash boot key, until you get boot option, If using CD put in disk wait few seconds, now boot from your USB thumb drive / CD drive, and erase everything, if you see partitions delete them, and should be left with one drive, then follow the steps to installing your OS.
B) If you wanna go extra mile, you want a 2nd USB thumb drive basically, and install something like Parted Magic OS on it, or other type of linux OS, something like it to do secure erase for your system HDD / SSD, and you want to do secure erase for the HDD/SSD, do check to ensure you done correctly, basically want all the 1's to be force to 0's and this will be the extra mile, for SSD it be done in seconds, for HDD may take time please note you do not want to format SSD/HDD to anything but the NTFS format if so don't mess with the format it need to be in. Then after finish doing it, time to install your OS like normally.
3. Once you have OS installed, fully updated, drivers all done, you will need to start chaging your passwords on all your things because again no idea what type of malware / virus you gotten, and keep your eye on your stuff overtime such as banking, or whatever. Again I have no idea what malware / virus you gotten yourself on your system.
If you want to try root out the malware / virus, and don't want to nuke.
You want to use few types of scanning softwares.
1. Download Malwarebytes, and Hitman Pro, and install them.
2. You want to restart PC in Safe mode, launch Malwarebytes enable root kit scan from the settings, yes you really want that enable, this will take a really long time for it to fully scan system with root kit enable but it gets the job done, so ensure that is enable then do a full system scan. Once finish restart, and do another scan with Hitman Pro, the reason want to use more than one anti virus scanner, is that you want to cover much ground as possible for any possible malware, trojan, and virus signatures, once you fully scan system with both anti virus scanner, then you can go back to Windows normally. I will recommend recording what files been found, and check the area in case it missed anything that shouldn't exist, or not suppose to be there, be warn if it finds things in system32, be aware what you're doing, or else you have to do Windows repair, or worse having to reinstall OS if repair not able to work out.
Off course to put the virus wasn't the EA, this would be silly to think by you.
Is not a new think to external people to put malicious file in big one, just look what happened to CCleaner time ago, and with an online game, even more a most abbandoned one like bf3 is easier.
Anyway the Hitman Pro suggested by Dr.Shadowds seem have solved the problem without doing the "nuke".