BreachCensus

Ransomware Attack

586 confirmed incidents.

VERIS: malware:RansomwareMITRE ATT&CK: T1486 (Data Encrypted for Impact)T1490 (Inhibit System Recovery)T1561 (Disk Wipe)

MITRE ATT&CK technique names and ids on this page are reproduced and distributed with the permission of The MITRE Corporation. © 2015–2026, The MITRE Corporation. MITRE ATT&CK and ATT&CK are registered trademarks of The MITRE Corporation.

Ransomware covers an attack that encrypts a victim's files and demands payment for the decryption key, frequently combined with a threat to publish stolen data if the ransom is not paid. It maps to three MITRE ATT&CK techniques: T1486 (Data Encrypted for Impact), the encryption itself; T1490 (Inhibit System Recovery), disabling backups and system-restore options so the victim cannot simply recover without paying; and T1561 (Disk Wipe), used by some ransomware operators as a fallback or pressure tactic. A ransomware group's own claim to have also copied data is tracked separately on the Threat groups page until independently confirmed.

Top organizations

OrganizationConfirmed incidents
Fluke Corporation2
Grays Harbor Community Hospital2
Premera Blue Cross2
1st Source Bank1
32 Pearls1
90 Degree Benefits, Inc. - Wisconsin1
AARP, Inc. & AARP Foundation1
ABC Legal Services, Inc.1
Abeo Solutions Inc. d/b/a Crystal Practice Management1
Abri Credit Union1
Absolute Dental Group, LLC1
Accutech Systems Corporation1
Ace Hardware Corporation1
Adapt Health (Philips Respironics, Inc.)1
Advance America, Cash Advance Centers of Washington, LLC1
Aetna Life Insurance Company1
Afni, Inc.1
Ahold Delhaize USA Services, LLC1
Akumin1
Alaska USA Credit Union (Kaye-Smith Enterprises, Inc.)1
Albany College of Pharmacy and Health Sciences1
Albertsons Companies, Inc.1
ALE Solutions, Inc.1
Alera Group, Inc.1
Alliance Physical Therapy Partners1

Recent incidents

OrganizationDisclosedJurisdictionRecords affected
Quatrro Business Support Services, Inc.September 9, 2026US-CA—
Mogren, Glessner & Ahrens, P.S.September 3, 2026US-WA—
AvtechTyee, Inc.August 28, 2026US-WA—
RB American Group LLCAugust 28, 2026US-WA—
Cascade Coffee, LLCAugust 26, 2026US-WA—
Murfreesboro Medical ClinicAugust 26, 2026US-CA—
Pan American Group LLCAugust 24, 2026US-CA—
Rockwood Retirement CommunitiesAugust 20, 2026US-WA—
Apple American Group LLC and Apple American Group II, LLCAugust 18, 2026US-WA—
Turner Construction CompanyAugust 18, 2026US-WA—
Paylogix, LLCAugust 14, 2026US-WA—
Baylor GeneticsAugust 14, 2026US-WA—
See’s Candies, Inc.August 13, 2026US-CA23,737
Kovack Financial, LLCAugust 10, 2026US-WA—
CTS Journey Holdings, LLC, a Delaware limited liability compAugust 3, 2026US-WA—
Microcode, Inc.July 30, 2026US-WA—
JRK Property Holdings, Inc.July 27, 2026US-WA113,641
Safetyfirst Systems, LLCJuly 23, 2026US-WA141,230
Kootenai County, IdahoJuly 22, 2026US-WA—
Unlimited Technology Systems, LLCJuly 21, 2026US-WA3,836,316
ZenPatient, Inc.July 17, 2026US-WA15,750
The Washington PostJuly 13, 2026US-WA—
Columbia Machine, Inc.July 9, 2026US-WA—
Evergreen Children’s Association, dba Kids Co.July 2, 2026US-WA—
NAVIENT CORPJuly 2, 2026US—
Tower Administrative Services, IncJune 26, 2026US-WA248,940
Grandview School DistrictJune 15, 2026US-WA—
Nelson UniversityJune 15, 2026US-WA—
Columbia Pacific Advisors, LLCJune 12, 2026US-WA—
Gay & Lesbian Community Services Center of Orange County, Inc.June 5, 2026US-CA—
Morning Star ToursJune 1, 2026US-TX18,997
Industrial Acceptance CorporationJune 1, 2026US-WA79,216
IMA Diligence Services, LLCMay 29, 2026US-WA—
Lakewood School DistrictMay 29, 2026US-WA—
University of St. Thomas-HoustonMay 26, 2026US-WA—
Cardinal Services, Inc, Cardinal Employer Organization, andMay 20, 2026US-WA—
REIC Rentals, LLCMay 18, 2026US-WA—
US Tiger Securities Inc. (“US Tiger”)May 15, 2026US-WA26,985
Fluke CorporationMay 14, 2026US-WA18,517
American Lending CenterMay 13, 2026US-WA123,158
Mt. Spokane PediatricsApril 30, 2026US-WA—
Bayside DentalApril 17, 2026US-WA—
Impac Mortgage Holdings, Inc.April 17, 2026US-WA—
Pediatric Products, LLCApril 14, 2026US-WA305,187
DermCare ManagementApril 8, 2026US-WA—
Rainier Clinical Research CenterApril 3, 2026US-WA—
Chapel Hill Presbyterian ChurchMarch 23, 2026US-WA—
Check CityMarch 19, 2026US-WA322,687
Kaplan North America, LLCMarch 17, 2026US-WA1,403,060
OSI Systems, Inc.March 11, 2026US-WA4,910

Questions and answers

How many confirmed incidents are classified as Ransomware Attack on Breach Census?

586 confirmed incidents are currently classified as Ransomware Attack.

Which organization has the most confirmed Ransomware Attack incidents?

Fluke Corporation, with 2 confirmed incidents classified this way.

Which MITRE ATT&CK techniques does the Ransomware Attack classification cover?

This classification maps to MITRE ATT&CK techniques T1486 (Data Encrypted for Impact), T1490 (Inhibit System Recovery), T1561 (Disk Wipe).

What counts as a confirmed incident for the Ransomware Attack classification?

An incident counts here once it carries the Ransomware Attack attack-type classification and has reached the confirmed status described on the Methodology page; a bare claim or press report is not enough.