WhatsApp has so far relied on past dealings with bad players within its platform to ramp up its efforts to curtail spam and other automated behavior. The Facebook -owned giant has now announced an additional step it plans to take beginning later this year to improve the health of its messaging service: going after those whose mischievous activities can’t be traced within its platform.

The messaging platform, used by more than 1.5 billion users, confirmed on Tuesday that starting December 7 it will start considering signals off its platform to pursue legal actions against those who are abusing its system. The company will also go after individuals who — or firms that — falsely claim to have found ways to cause havoc on the service.

The move comes as WhatsApp grapples with challenges such as spam behavior to push agendas or spread false information on its messaging service in some markets. “This serves as notice that we will take legal action against companies for which we only have off-platform evidence of abuse if that abuse continues beyond December 7, 2019, or if those companies are linked to on-platform evidence of abuse before that date,” it said in an FAQ post on its site.

A WhatsApp spokesperson confirmed the change to TechCrunch, adding, “WhatsApp was designed for private messaging, so we’ve taken action globally to prevent bulk messaging and enforce limits on how WhatsApp accounts that misuse WhatsApp can be used. We’ve also stepped up our ability to identify abuse, which helps us ban 2 million accounts globally per month.”

Earlier this year, WhatsApp said (PDF) it had built a machine learning system to detect and weed out users who engage in inappropriate behavior, such as sending bulk messages or creating multiple accounts with intention to harm the service. The platform said it was able to assess the past dealings with problematic behaviors to ban 20% of bad accounts at the time of registration itself.

But the platform is still grappling to contain abusive behavior, a Reuters report claimed last month. The news agency reported about tools that were readily being sold in India for less than $15 that claimed to bypass some of the restrictions that WhatsApp introduced in recent months.

TechCrunch understands that with today’s changes, WhatsApp is going after those same set of bad players. It has already started to send cease and desist letters to marketing companies that claim to abuse WhatsApp in recent months, a person familiar with the matter said.