Jan 4 (Reuters) - Alphabet Inc-owned (GOOGL.O) Google said on Tuesday its cloud division had acquired Israeli cybersecurity startup Siemplify, as the U.S. tech giant expands its security offerings amid rising cyber attacks. Financial details of the deal were not disclosed by the companies, but a source familiar with the matter said Google paid about $500 million in cash for Siemplify. The deal came after Google made a pledge to U.S. President Joe Biden last August to invest $10 billion in cybersecurity over the next five years, amid a significant rise in cyber attacks and data breaches. Siemplify, led by co-founder and chief executive Amos Stern, provides security orchestration, automation and response solutions. It has raised $58 million from investors including G20 Ventures and 83North. With a partnership with Google Cloud, Siemplify attracted the buyer"s interest as it was in the process of raising a new round of private capital, the source added. Since the pandemic started in 2020, Google"s revenue from the cloud business has nearly doubled to around $5 billion as companies shifted to working from home. The need to protect and hedge against security threats has shot up in tandem, with big corporates also beefing up on cybersecurity products. Google said Siemplify"s platform would be integrated into its cloud and serve as the foundation for the capabilities it will invest in. The buyout, Google"s first Israeli cybersecurity firm deal, will help the tech giant take advantage of the Middle Eastern nation"s deep pool of cybersecurity talent. Guggenheim Securities advised Siemplify on the transaction. Reporting by Krystal Hu in Toronto and Eva Mathews in Bengaluru Editing by Krishna Chandra Eluri and Mark Potter