Following its efforts to take legal action against those misusing its social media platform, Facebook has now filed a new lawsuit against a Hong Kong-based advertising company and two Chinese individuals for allegedly abusing its ad platform to distribute malware and Ad fraud.

Facebook filed the lawsuit on Thursday in the Northern District of California against ILikeAd Media International Company Ltd. as well as a Chinese software developer and a marketing director working for the firm, Chen Xiao Cong and Huang Tao.

All three defendants have been alleged to have deceived people into installing malware on their systems, enabling them to compromise user’s Facebook accounts and then using those hacked accounts to advertise counterfeit goods and diet pills—which is clearly in violation of Facebook’s Terms and Advertising Policies.

According to the social media giant, the defendants made use of improper practices such as “celeb bait” and “cloaking” to bait Facebook users into downloading and installing malware that eventually compromised their Facebook accounts.

While ‘cloaking’ involves deliberately disguising the true destination of a link in the ad by displaying one version of the ad’s landing page to Facebook and another version to Facebook users, ‘celeb bait’ involves misusing celebrities photos in ads to entice users to click on them.

Since April, Facebook has notified hundreds of thousands of users that their accounts may have been compromised and instructing them to change their passwords, according to the complaint.

Facebook also said the social media company had issued more than $4 million in refunds to victims whose Facebook accounts were used to run unauthorized ads and also helped to secure their accounts compromised in this malicious advertisement scheme.

This is the latest lawsuit that Facebook filed in a federal court against entities and individuals abusing its properties for malicious intent.

Just over a month ago, Facebook sued surveillance vendor NSO Group for allegedly hacking 1,400 mobile devices by misusing the company’s secure messaging platform, WhatsApp.

In August this year, Facebook also filed a lawsuit against two shady Android app developers, Hong Kong-based ‘LionMobi’ and Singapore-based ‘JediMobi,’ for allegedly running a “click injection fraud” scheme that programmed bots to click on Facebook ads.

In March this year, Facebook also took two Ukrainian men into the courts for allegedly using quiz apps on the platform to distribute malware that steals Facebook users’ data.

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