Disclosure context

About Knight

Knight is a relatively new ransomware group that emerged in September 2023, operating with primarily financial motivations and demonstrating a focus on targeting critical infrastructure and high-value sectors. The group's origin and specific affiliations remain largely undocumented in public threat intelligence reports, though their operational patterns suggest they operate as an independent entity rather than a established ransomware-as-a-service model. With 48 known victims since their emergence, Knight has shown a preference for targeting organizations across the United States, Brazil, Italy, Spain, and Germany, with particular focus on healthcare, manufacturing, media, and government sectors. Their attack methodology and specific technical capabilities have not been extensively documented by major security firms, though their targeting of healthcare and government entities suggests they employ effective initial access techniques and likely utilize double extortion tactics common among contemporary ransomware groups. While specific notable campaigns have not been widely publicized by CISA, FBI, or major security researchers, the group's consistent activity across multiple countries and high-value sectors indicates sustained operational capability. Knight appears to remain active as of current reporting, though detailed technical analysis and specific law enforcement actions against the group have not been publicly documented by authoritative sources. The group has been linked to 48 public disclosures across our corpus. First observed on a leak site on September 6, 2023; most recent post February 12, 2024. The operation is currently inactive.

Timeline of this disclosure

November 20, 2023Dreyfuss Williams & Associates Co., LPA listed by Knighton the group's public leak site

Data size: 300 GB

Sector and geography

This disclosure adds to ransomware activity in the Legal sector, which has 21 disclosures indexed across all operators we track. Geographically, Dreyfuss Williams & Associates Co., LPA 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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Dreyfuss Williams & Associates Co., LPA

Claimed by Knight · listed 2 years ago

300 GB

Data size

30m

Age

since listed · data leaked

Status timeline

Listed
Nov 20, 2023
Data leaked

At a glance

Group: Knight
Status: Data leaked
Country: United States
Sector: Legal
Listed on leak site: Nov 20, 2023
Data size: 300 GB

About the victim

AI dossier — public-source company profile

Dreyfuss Williams & Associates Co., LPA is an Ohio-based law firm specializing in health care law, providing legal representation to hospitals and other medical providers on third-party claim reimbursement issues. The firm maintains offices in Independence and Westerville, Ohio, and serves clients across areas including ERISA, health insurance litigation, managed care, and government payer matters. As a legal intermediary between medical providers and payers, the firm handles large volumes of patient and insurance financial records.

Industry: Health Care Law & Third-Party Medical Claim Reimbursement
Address: 6060 Rockside Woods Blvd. N. Suite 235, Independence, OH 44131

Attack summary

Severity: critical — The group claims exfiltration of 300 GB of data including SSNs and DOBs for 100,000+ US residents, representing large-scale regulated PII exposure from a health care law firm handling sensitive patient and insurance records; partial data has already been published publicly.

The Knight ransomware group claims to have exfiltrated over 300 GB of data from Dreyfuss Williams & Associates, comprising 100,000+ documents containing personally identifiable information on US residents including Social Security Numbers and dates of birth, and has published a portion of the data via an onion-hosted archive as proof.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Social Security Numbers (SSN)
Dates of birth (DOB)
US resident PII
Patient financial/claim documents
Legal case files
Third-party reimbursement records

The group's post references roughly 3 proof files.

What the group claims

Domain:www.dreyfuss.com300GB+ of data has been downloaded from Dreyfuss100k+ documents containing information on USA residents including SSN DOB.We wait for you on our chat to take this further if not then we will upload data for the world to see.Disclose a portion of the data : http://r6chas4skrvna72fg5ui3cqkke4fnpinsskvlo57aiolrrdb3r777mqd.onion/dreyfuss/enjoy.zipEnjoy!proof1.png 7.1 KBproof2.png 83.61 KBproof3.png 191.75 KB

Sources

Victim sitedreyfuss.com
Leak posthttp://knight3xppu263m7g4ag3xlit2qxpryjwueobh7vjdc3zrscqlfu3pqd.onion/69d945d3-99e1-4585-9ac9-60515681d915/

Source

Indexed 2 years 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.