Disclosure context

About LockBit

LockBit is a highly prolific ransomware group that emerged in October 2020 and has become one of the most active ransomware operations globally, with over 3,500 documented victims and a primary motivation of financial gain through extortion. The group is suspected to originate from Russia and operates as a Ransomware-as-a-Service (RaaS) model, recruiting affiliates to conduct attacks while providing them with ransomware tools, infrastructure, and support. LockBit primarily gains initial access through exploiting vulnerabilities in public-facing applications, credential stuffing attacks, and phishing campaigns, employing double extortion tactics where they steal sensitive data before encrypting systems and threatening to leak the information if ransom demands are not met. The group has demonstrated significant technical sophistication, developing multiple variants including LockBit 3.0 (also known as LockBit Black), and has been particularly active in targeting business services, manufacturing, technology, and healthcare sectors across the United States, France, Germany, United Kingdom, and Italy. Despite ongoing law enforcement efforts and international cooperation to disrupt their operations, including seizures of infrastructure and arrests of affiliates, LockBit has shown resilience and adaptability, continuing to operate and evolve their tactics while maintaining their position as one of the most dominant ransomware threats in the cybercriminal landscape. The group has been linked to 3,536 public disclosures across our corpus. First observed on a leak site on October 21, 2020; most recent post March 30, 2026. The operation is currently active.

Also tracked as: LockBit 3.0, LockBit Black, LockBit Green, ABCD ransomware.

Timeline of this disclosure

March 28, 2026Physician's Medical Billing Inc listed by LockBiton the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Healthcare/Medical Services sector. Geographically, Physician's Medical Billing Inc is reported in United States, a country with 7,392 ransomware disclosures in our corpus.

How we know this. Darkfield monitors public ransomware leak sites continuously, archiving every new disclosure and the data later released against the victim. Each entry on this page is sourced from the operator's own publication and cross-checked against complementary OSINT feeds (RansomLook, ransomware.live, RansomWatch). We do not collect or host stolen data — only the metadata, timestamps and screenshots needed to make the public disclosure searchable and accountable. Records here are corrected when the original post is edited, retracted, or merged with another disclosure.

Ransomware victim disclosure

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Physician's Medical Billing Inc

Claimed by LockBit · listed 2 months ago

53d

Age

since listed · listed for ransom

Status timeline

Listed
Mar 28, 2026

Current state: Listed for ransom

At a glance

Group: LockBit
Status: Listed for ransom
Country: United States
Sector: Healthcare/Medical Services
Listed on leak site: Mar 28, 2026

About the victim

AI dossier — public-source company profile

Physician's Medical Billing Inc (PMB) is a full-service medical billing and accounts receivable management firm serving physician practices in the United States. The company's stated goal is maximum reimbursement for its clients through comprehensive billing services. No further details on size, location, or founding date are available from the leak post or a public site.

Industry: Medical Billing & Accounts Receivable Management

Attack summary

Severity: high — A medical billing firm handles regulated patient health and financial data (PHI, insurance claims, payment records) at scale on behalf of multiple physician practices, making any confirmed compromise inherently high-severity even without explicit proof of exfiltration volume.

LockBit listed Physician's Medical Billing Inc on its leak blog on 8 April 2025, claiming the company as a new victim. The post does not specify whether data was encrypted, exfiltrated, or both, and no data size, ransom amount, or proof files are advertised.

high

What the group claims

Medical billing and accounts receivable management data

The leak post

captured from the group's site

[ new blog domain lockbit 5.0  New secure blog domain, with a multi-layered protection system against all-powerful FBI agents lockbitapt67g6rwzjbcxnww5efpg4qok6vpfeth7wx3okj52ks4wtad.onion  Updated: 05 Dec, 2025, 10:16 UTC  ](http://lockbit3753ekiocyo5epmpy6klmejchjtzddoekjlnt6mu3qh4de2id.onion/post/Z4TENkdajdrO2dbx6932b0f72d10f) [ Cash in on big wins this tax season! Every hour from 5 - 9 pm, one lucky winner will snag $1,040 in CASH or Free Play! Earn just 25 points, print your voucher at a kiosk, and drop it in the drawing barrel for your shot at a hefty payout!  Updated: 24 Apr, 2025, 11:09 UTC  ](http://lockbit3753ekiocyo5epmpy6klmejchjtzddoekjlnt6mu3qh4de2id.onion/post/0ExUTjl9SZBWFqzh680a1beb5c857) [ Managing capital on behalf of institutional investors, family offices, and high net worth individuals. We focus on niche commodities strategies with an emphasis on the energy transition.  Updated: 23 Apr, 2025, 11:08 UTC  ](http://lockbit3753ekiocyo5epmpy6klmejchjtzddoekjlnt6mu3qh4de2id.onion/post/BtTEmcA14uQIPZv76808ca399f414) [ E' definito molto più di un registratore di cassa. Nettun@ 3000 Touch Olivetti effettivamente concede agli esercenti una serie di opportunità che altri…

Data the group says was taken

medical_records
financial

Sources

Leak posthttp://lockbit3753ekiocyo5epmpy6klmejchjtzddoekjlnt6mu3qh4de2id.onion

Source

Indexed 2 months ago

This page surfaces a public ransomware disclosure indexed by Darkfield. Original posts come from the operator's own leak site; we cross-check against ransomware.live, RansomLook and RansomWatch where applicable. Share this URL freely.