MCBS (Medical Computer Business Services) hit by ransomware attack
Incident
Summary
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MCBS disclosed a data breach after attackers accessed its systems from September 22 to September 26, 2025, putting 1,261,464 people at risk of stolen personal, health insurance, and medical information. The company’s notification also says seven healthcare organizations were named as compromised in the cyberattack. The breach has been linked to a PEAR ransomware claim that says more than 3 TB of files were taken and later posted for download.
Related Happenings
MCBS data leak claimed by PEAR ransomware group
Data Leak
H score71
First: 27.07.2026 07:51
Last: 27.07.2026 07:51
Sources 1
How related:
The hackers have made available for download the information allegedly stolen from the company.
About this happening:
A PEAR ransomware group leak made allegedly stolen MCBS files available for download, exposing personal, financial, HR, patient, payment, and email data. The leak is t...
MCBS data leak claimed by PEAR ransomware group
Data LeakHow related: The hackers have made available for download the information allegedly stolen from the company.
About this happening: A PEAR ransomware group leak made allegedly stolen MCBS files available for download, exposing personal, financial, HR, patient, payment, and email data. The leak is t...
BlackCat (ALPHV) multi-victim ransomware extortion campaign against U.S. companies
Campaign
H score53
First: 30.12.2025 17:25
Last: 30.12.2025 17:25
Sources 1
About this happening:
Two former cybersecurity workers pleaded guilty for participation in a BlackCat (ALPHV) ransomware extortion campaign that hit multiple U.S. victims, showing how affiliate...
BlackCat (ALPHV) multi-victim ransomware extortion campaign against U.S. companies
CampaignAbout this happening: Two former cybersecurity workers pleaded guilty for participation in a BlackCat (ALPHV) ransomware extortion campaign that hit multiple U.S. victims, showing how affiliate...
Timeline
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27.07.2026 07:51 2 articles · 0h ago
MCBS discloses a September 2025 data breach and PEAR claims responsibility
Initial DisclosureAtlanta-based MCBS disclosed a data breach tied to unauthorized access to its systems between September 22 and September 26, 2025, with investigators saying files containing names, addresses, SSNs, dates of birth, health insurance information, and medical information may have been stolen. The breach notification says 1,261,464 individuals are affected, names seven healthcare organizations whose data was compromised, and the PEAR ransomware group later claimed responsibility and said it stole more than 3 TB of files and posted the data for download.
Show sources
- MCBS Data Breach Affects 1.2 Million Individuals — www.securityweek.com — 27.07.2026 07:51
- MCBS Data Breach Affects 1.2 Million Individuals — www.securityweek.com — 27.07.2026 07:51