Trojan.JS.Likejack

Classification

Malware

Trojan

JS

JS:Trojan.JS.Likejack.A

Summary

Trojan.JS.Likejack is JavaScript malware that silently trickes the user into clicking a 'Like' button for a Facebook page without their knowledge or authorization.

Removal

Automatic action

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.

Suspect a file is incorrectly detected (a False Positive)?

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

  • Check for the latest database updates

    First check if your F-Secure security program is using the latest detection database updates, then try scanning the file again.

  • Submit a sample

    After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.

    NOTE If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.

  • Exclude a file from further scanning

    If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.

    Note You need administrative rights to change the settings.

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Submit a sample

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Technical Details

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.