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.
Trojan.JS.Likejack is essentially a form of 'clickjacking', in which an attacker uses HTML or coding trickery to disguise a 'Like' button or tag and place it on a page in such a way that the user is lured into unintentionally clicking it. For example, this can be done by placing a transparent button over a link and asking the user to click the link, thus inadvertently also clicking the button. By doing so, the attacker can fraudulently gain 'Likes'; with enough 'Likes', the attacker can then distribute other fake or malicious content.
Trojan.JS.Likejack is often distributed in fake or compromised webpages and in malicious videos spread on forums or social media.
In late November 2014, this malware was reportedly found being used in videos posted on Facebook that were related to a premium car giveaway scam.
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