Service Employees' International Union
quantumThis record tracks a ransomware attack claimed by the quantum group against Service Employees' International Union. It collects the publicly disclosed attack details — sector, location and timeline — as published on the operator's leak site and indexed by Breach House.
Window Zero
EXPOSURE GAPWindow Zero is the time the breach stayed in the open before anyone said so — the gap between when the attack was first discovered on the operator's leak site (t1) and when it was publicly disclosed (t2). The wider this window, the longer victims, staff and customers were exposed with no warning.
Attack Summary
Service Employees' International Union (SEIU) is a US labor union based in the United States that represents about 2 million members across healthcare, public services and property services. It organizes workers in roles such as hospital, home care, public-sector, janitorial, security and food service work, and advocates for better wages, benefits and workplace conditions. In cyber-threat-intelligence listings, SEIU appears as a ransomware victim associated with quantum.
Leak Screenshots
SAMPLEProof-of-breach screenshots the operator posted from the stolen data. Previews are redacted and locked — the originals are available on HaveIBeenRansom.