AT&T disclosed that attackers used credentials stolen by infostealers to authenticate into its Snowflake cloud-data-warehouse tenant — which lacked MFA — and exfiltrated call and text metadata covering nearly all 110 million AT&T wireless customers.
A threat cluster tracked as UNC5537 / ShinyHunters used credentials harvested by infostealer malware to log into ~160 Snowflake customer tenants that lacked MFA. Victims included AT&T, Ticketmaster, Santander, LendingTree, Advance Auto Parts, Neiman Marcus, and Bausch Health. Ticketmaster alone exposed data for ~560 million users.
Victim
Snowflake customer tenants (~160 organisations: AT&T, Ticketmaster, Santander, LendingTree, Advance Auto Parts, Neiman Marcus, Bausch Health, et al.)
Attackers used credentials reused from prior breaches to access 23andMe accounts, then leveraged the 'DNA Relatives' feature to scrape ancestry and genetic profile data on 6.9 million users from compromised relatives' connections.