CounterTack Inc., a Waltham-based cybersecurity firm that has already raised more than $70 million from Goldman Sachs and others, announced Tuesday it has tacked on another $20 million in a Series D round of funding.

The latest round involves two new investors. It’s led by Singtel Innov8, the venture arm of Singapore telecom giant The Singtel Group, with participation from SAP National Security Services, a division of German software giant SAP (NYSE: SAP) that focuses on data and analytics technologies to benefit U.S. national security organizations.

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