Disclosure context

About Lorenz

Lorenz is a ransomware group that emerged in January 2020 and operates primarily for financial gain, having claimed approximately 78 victims across multiple sectors. The group's origin and specific affiliations remain largely undocumented by major threat intelligence organizations, though their targeting patterns suggest a focus on English-speaking nations including the United States, United Kingdom, and Australia. Lorenz primarily targets healthcare, finance, automotive, construction, and retail sectors, suggesting they may opportunistically attack organizations with valuable data and limited security resources rather than following a specific geopolitical agenda. While detailed technical analysis of their attack methodology has not been extensively published by major security firms like Mandiant or government agencies such as CISA, the group appears to follow typical ransomware deployment patterns common to financially-motivated cybercriminal organizations. Public documentation of specific high-profile campaigns, notable victims, or significant law enforcement actions against Lorenz remains limited in open-source intelligence reporting. Based on available victim data extending beyond 2020, the group appears to have maintained some level of operational activity, though comprehensive assessments of their current operational status have not been widely published by authoritative sources in the threat intelligence community. The group has been linked to 78 public disclosures across our corpus. First observed on a leak site on January 12, 2020; most recent post December 11, 2023. The operation is currently inactive.

Timeline of this disclosure

February 6, 2023AmerisourceBergen/Censora - MWI Animal Health listed by Lorenzon the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Healthcare sector, which has 1,779 disclosures indexed across all operators we track. Geographically, AmerisourceBergen/Censora - MWI Animal Health 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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AmerisourceBergen/Censora - MWI Animal Health

Claimed by Lorenz · listed 3 years ago

39m

Age

since listed · data leaked

Status timeline

Listed
Feb 6, 2023
Data leaked

At a glance

Group: Lorenz
Status: Data leaked
Country: United States
Sector: Healthcare
Listed on leak site: Feb 6, 2023

About the victim

AI dossier — public-source company profile

MWI Animal Health is a Cencora (formerly AmerisourceBergen) business that distributes animal health products, medications, supplies, and capital equipment to veterinarians, livestock producers, and agricultural retailers across the United States and select international markets (Denmark, Norway, Sweden, UK). The company also provides technology solutions including practice management tools, pharmacy services, inventory management, and compliance solutions under brands such as AllyDVM, Micro Technologies, and Securos Surgical.

Industry: Animal Health Distribution & Veterinary Technology Solutions

Attack summary

Severity: high — Data has been published by the threat actor, and the company's public website references a data security incident settlement involving personal information of certain individuals, confirming exfiltration of PII. MWI Animal Health handles sensitive business and customer data across a large veterinary and agricultural customer base under the Cencora corporate umbrella, indicating significant scale and sensitivity.

The Lorenz ransomware group claims responsibility for an attack on MWI Animal Health, with the disclosure status recorded as data_published. No specific details about encryption, exfiltration volume, or data categories were captured in the leak post.

high

Data the group says was taken

AI dossier — extracted from the leak post

Personal information of individuals associated with MWI Animal Health (per settlement notice on public site)

Sources

Victim sitemwiah.com

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.