JS.Nemucod.[variant].Gen, Generic.JS.Nemucod[variant], Generic.JS.NemucodA.[variant], Js:trojan.downloader.nemucod.[variant], JS:Trojan.Downloader.Nemucod.[variant], Trojan.JS.Downloader.Nemucod.[variant], Trojan-Downloader:JS/Nemucod.[variant]
Trojan-Downloader.JS.Nemucod downloads and runs additional malicious files onto the system. The downloaded files are typically info-stealers, though in more recent campaigns Nemucod has also been seen delivering ransomware.
Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.
The emails used to deliver Nemucod are typically spam, sent out to recipients in mass mailings by the malware's distributors. The emails are usually social-engineered to appear legitimate or enticing.
Nemucod is usually used by attackers to distribute malware such as Zeus variants or various password- or info-stealers. In more recent malware distribution campaigns, the file observed being downloaded by Nemucod has been ransomware, typically either TeslaCrypt or Locky.
Nemucod may also open a separate document as a decoy to mislead the user.
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