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Antivirus Real-time Scanner
An antivirus does real-time scanning of system memory, OS and files and detects, prevents, and removes malicious code. It applies signature-based detection methods, heuristic detection methods, and rootkit detection tools. Furthermore prevents a significant level of intrusions and malware to prevent computers from being infected.
Symantec, McAfee, Avira, Avast, AVG, Quick Heal, Comodo, Avast Software, ESET, Bitdefender, Fortinet, F-Secure, G DATA Software, Qihoo 360, Kaspersky, Panda Security, Trend Micro, Microsoft, Rising, Cheetah Mobile, AhnLab
A virus persists on a system after a reboot and starts with the system. They acquire strain's ability with persistence by modifying boot sectors, hijacking the Windows COM system or DLL's and shortcut files, using Windows Registry to add registry keys to call malicious code on boot-up.
Researchers have found new malware persistence method on Windows 10 leveraging Microsoft UWP apps like the Cortana and People apps.
Virus Steal User Data – Mac and iPhone devices are also not safe
App Store to Remove iPhone Antivirus Apps
iOS designed with security in mind, hence antivirus app not needed. Also, its sandbox environment does not allow apps to interact with other data or scan other apps. Thus, they won't steal data or infect other apps. Furthermore, a user cannot install an app outside of the App Store. An app undergoes a thorough review process, in which code examined before allowing into the App Store, hence discourages and make it difficult for the developer to sneak malicious code onto the platform.
On Android, a user can install apps outside of the Google Play Store via APK files.