Trojan.Nymaim is Malwarebytes' detection name for a family of Trojan downloaders that also use a screen locker to demand a ransom.
Trojan.Nymaim is a Trojan downloader. These downloaders are Trojans that download (and run) other malware on affected systems. Trojan.Nymaim is different in that it displays a localized lockscreen while it downloads additional malware. Trojan.Nymaim is usually delivered by exploit kits and malvertising.
Malwarebytes can detect and remove Trojan.Downloader without further user interaction.
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