Was Hospital Italiano de Buenos Aires hit by ransomware?

Hospital Italiano de Buenos Aires was listed by the Knight ransomware operation (Argentina), and stolen data was published on the group's leak site. Darkfield tracks this disclosure with the original leak post, screenshot and group context.

Who is the Knight ransomware group?

Knight is a ransomware operator tracked by Darkfield. See the full operator dossier for its known victims, sectors targeted, IOCs and leak-site infrastructure.

What data was leaked in the Hospital Italiano de Buenos Aires breach?

Knight published data attributed to Hospital Italiano de Buenos Aires. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

← All victims

Hospital Italiano de Buenos Aires

Claimed by Knight · listed 3 years ago

33m

Age

since listed · data leaked

Status timeline

ListedOct 13, 2023
Data leakeddate unknown

At a glance

Group: Knight
Status: Data leaked
Country: Argentina
Sector: Healthcare
Listed on leak site: Oct 13, 2023

About the victim

AI dossier — public-source company profile

Hospital Italiano de Buenos Aires is a non-profit civil association founded in 1853, dedicated to comprehensive healthcare in Argentina. It provides medical assistance, undergraduate and postgraduate medical education, and conducts health research. It is one of the largest and most prestigious private hospital networks in Argentina.

Industry: Hospital & Healthcare Services
Address: Gaspar Campos 450, Buenos Aires, Argentina
Employees: 5000+
Founded: 1853

Attack summary

Severity: critical — The victim is a major hospital handling sensitive medical and personal health information at large scale. Data has been published (not merely threatened), meaning regulated health data (PII, medical records) for potentially tens of thousands of patients is confirmed exfiltrated and exposed.

The Knight ransomware group claims to have attacked Hospital Italiano de Buenos Aires and has published data (disclosed_status: data_published), indicating exfiltration of patient and/or institutional records from one of Argentina's largest hospital systems.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Patient medical records
Personal identifying information (PII)
Staff/personnel data
Administrative and financial records
Academic/research records

What the group claims

El Hospital Italiano de Buenos Aires es una asociación civil sin fines de lucro dedicada al cuidado integral de la salud. Desde 1853, brinda asistencia médica, forma alumnos de grado y de posgrado, y…

Sources

Source

Indexed 3 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.

Is this your supplier? Your competitor? You?

Pro plans monitor your domain, corporate emails, and crypto wallets across every new ransomware leak-site post, breach dump and Telegram callout — alerts within 5 minutes.

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

October 13, 2023Hospital Italiano de Buenos Aires listed by Knighton the group's public leak site

Other recent disclosures by Knight

Knight has been linked to 48 public victims on Darkfield. A sample of the most recent:

See the full Knight dossier →

Sector and geography

This disclosure adds to ransomware activity in the Healthcare sector, which has 2,600 disclosures indexed across all operators we track. Geographically, Hospital Italiano de Buenos Aires is reported in Argentina, a country with 67 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Knight means Hospital Italiano de Buenos Aires appeared on a ransomware extortion site and data attributed to it has been published. If this is your organisation, or a supplier you depend on, the priority is to confirm the intrusion and contain it before the window to act closes.

Engage your incident-response team and preserve forensic evidence before remediating — do not wipe affected systems first.
Force a password reset and revoke active sessions for exposed accounts; rotate any credentials, API keys or certificates that may have been in the stolen data.
Assess regulatory notification duties (GDPR, NIS2, sector regulators) — many carry a 72-hour reporting clock from awareness.
Monitor for the data appearing on Knight's leak site and across paste and breach channels, and brief downstream partners who may be exposed through you.

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.