Payroll giant PrismHR outage likely caused by ransomware attack

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Leading payroll company PrismHR is suffering a massive outage after suffering a cyberattack this weekend that looks like a ransomware attack from conversations with customers.
PrismHR is an online payroll, benefits, and human resources platform used by Professional employer organizations (PEO). PEOs use this platform to provide payroll, HR, and benefits services to their clients, commonly small and medium-sized businesses.
PrismHR is a massive business services company servicing over 80,000 organizations with 2 million employees and total annual payrolls of over $80 billion.
When BleepingComputer contacted PrismHR with questions regarding this attack, they confirmed the attack occurred on February 28th, 2021. However, PrismHR would not share further details other than the statement below.
"We recently experienced a cyber incident that affected our payroll and benefits software used by Professional Employer Organizations (PEOs) throughout the US. We immediately disabled access to the system to protect customer information and engaged top-tier security experts to help on this. We are working quickly to restore customer access to our platform. While we are still looking into this, there is currently no evidence of unauthorized access or theft of data contained on our servers." - PrismHR
 
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