On Nov. 6, 2025, Archer Health, a provider of onsite and on-demand healthcare services for businesses, reported a significant data breach to the U.S. Department of Health and Human Services. According to the official disclosure, the breach compromised personally identifiable information (PII) and protected health information (PHI) of at least 4,285 individuals across the U.S.
The attack was first made public on the dark web on Sept. 7, 2025, when KillSec announced they had accessed Archer Health’s data and threatened to publish it within seven to eight days. The nature of the breach was classified as ransomware, indicating that attackers not only encrypted files but also exfiltrated data, a tactic increasingly used to pressure organizations into paying a ransom.
Compromised information includes names, dates of birth, Social Security numbers and medical information. The exposure of both PII and PHI puts individuals at risk of identity theft and medical fraud. In addition to reporting the breach to relevant authorities, the company has posted a notice of data privacy incident on its website.
Archer Health's response
In response to the breach, Archer Health has notified the U.S. Department of Health and Human Services and begun the process of informing affected individuals. Because the breach involved ransomware and the threat of data publication on the dark web, those impacted should be vigilant for signs of identity theft, fraud or phishing attempts.
It is recommended tha
Source: https://www.claimdepot.com/data-breach/archer-health-2025
Archer Health cybersecurity rating report: https://www.rankiteo.com/company/archer-health
"id": "ARC1764959059",
"linkid": "archer-health",
"type": "Ransomware",
"date": "11/2025",
"severity": "100",
"impact": "4",
"explanation": "Attack with significant impact with customers data leaks"{'affected_entities': [{'customers_affected': '4285',
'industry': 'Healthcare',
'location': 'U.S.',
'name': 'Archer Health',
'size': None,
'type': 'Healthcare Services Provider'}],
'customer_advisories': 'Notice of data privacy incident posted '
'on the company website and notifications '
'sent to affected individuals.',
'data_breach': {'data_encryption': 'Yes',
'data_exfiltration': 'Yes',
'file_types_exposed': None,
'number_of_records_exposed': '4285',
'personally_identifiable_information': ['Names',
'Dates '
'of '
'birth',
'Social '
'Security '
'numbers',
'Medical '
'information'],
'sensitivity_of_data': 'High',
'type_of_data_compromised': ['Personally '
'identifiable '
'information (PII)',
'Protected health '
'information '
'(PHI)']},
'date_publicly_disclosed': '2025-11-06',
'description': 'Archer Health, a provider of onsite and '
'on-demand healthcare services for businesses, '
'reported a significant data breach compromising '
'personally identifiable information (PII) and '
'protected health information (PHI) of at least '
'4,285 individuals. The breach was classified as '
'ransomware, with attackers encrypting files and '
'exfiltrating data to pressure the organization '
'into paying a ransom.',
'impact': {'brand_reputation_impact': None,
'conversion_rate_impact': None,
'customer_complaints': None,
'data_compromised': 'Personally identifiable '
'information (PII) and protected '
'health information (PHI)',
'downtime': None,
'financial_loss': None,
'identity_theft_risk': 'High',
'legal_liabilities': None,
'operational_impact': None,
'payment_information_risk': None,
'revenue_loss': None,
'systems_affected': None},
'initial_access_broker': {'backdoors_established': None,
'data_sold_on_dark_web': None,
'entry_point': None,
'high_value_targets': None,
'reconnaissance_period': None},
'motivation': 'Extortion',
'post_incident_analysis': {'corrective_actions': None,
'root_causes': None},
'ransomware': {'data_encryption': 'Yes',
'data_exfiltration': 'Yes',
'ransom_demanded': None,
'ransom_paid': None,
'ransomware_strain': None},
'recommendations': 'Affected individuals should be vigilant for '
'signs of identity theft, fraud, or phishing '
'attempts.',
'references': [{'date_accessed': '2025-09-07',
'source': 'Dark web announcement by KillSec',
'url': None}],
'regulatory_compliance': {'fines_imposed': None,
'legal_actions': None,
'regulations_violated': ['HIPAA'],
'regulatory_notifications': ['U.S. '
'Department '
'of '
'Health '
'and '
'Human '
'Services']},
'response': {'adaptive_behavioral_waf': None,
'communication_strategy': 'Posted a notice of data '
'privacy incident on its '
'website and notified '
'affected individuals',
'containment_measures': None,
'enhanced_monitoring': None,
'incident_response_plan_activated': None,
'law_enforcement_notified': None,
'network_segmentation': None,
'on_demand_scrubbing_services': None,
'recovery_measures': None,
'remediation_measures': None,
'third_party_assistance': None},
'threat_actor': 'KillSec',
'title': 'Archer Health Data Breach',
'type': 'Ransomware'}