The world’s largest software company said Wednesday it would acquire CloudKnox, a Silicon Valley startup that sells tools to help companies manage and secure access to cloud accounts and data.

Financial terms of the deal were not disclosed. CloudKnox, based in Sunnyvale, Calif., raised a total of $22.8 million in venture capital investments since its launch in 2016.

The CloudKnox deal is Microsoft’s fourth cybersecurity acquisition over the last 12 months. It comes just weeks after Redmond announced plans to purchase threat-intelligence vendor RiskIQ for to lead a push into the attack surface management business.