The White House has sent out recommendations to the private sector over how to protect themselves from cyber intrusions after a series of attacks left companies and government agencies vulnerable.

Deputy National Security Advisor for Cyber and Emerging Technology Anne Neuberger in a memo obtained by The Hill sounded the alarm over recent high-profile attacks against places like Colonial Pipeline and SolarWinds and said the private sector must recognize the dire threat that hacks pose to its companies.

“All organizations must recognize that no company is safe from being targeted by ransomware, regardless of size or location,” she wrote. “Much as our homes have locks and alarm systems and our office buildings have guards and security to meet the threat of theft, we urge you to take ransomware crime seriously and ensure your corporate cyber defenses match the threat.”