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Simon Property Group

Claimed by Medusa · listed 8 months ago

3.000 employees
Records
8m
Age
since listed · data leaked

Status timeline

  1. ListedNov 7, 2025
  2. Data leakeddate unknown

At a glance

Group
Medusa
Status
Data leaked
Country
United States
Sector
Financial Services
Listed on leak site
Nov 7, 2025
Records
3.000 employees

About the victim

AI dossier — public-source company profile

Simon Property Group is one of the largest real estate investment trusts (REITs) in the United States, specializing in the ownership, development, and management of premier shopping, dining, entertainment, and mixed-use destinations. The company operates hundreds of properties across North America, Europe, and Asia, including major regional malls, premium outlets, and The Mills centers. Simon is publicly traded on the NYSE under the ticker SPG.

Industry
Real Estate Investment Trust (REIT) – Retail Mall Operations
Address
225 West Washington Street, Indianapolis, Indiana 46204, United States
Employees
5000
Founded
1960

Attack summary

Severity: high — Simon Property Group is a large publicly traded REIT with thousands of employees and extensive tenant relationships. A 'data_published' status indicates confirmed exfiltration and public release of data, which likely includes significant business-sensitive and potentially regulated PII at scale, warranting a high severity rating. Critical would require stronger confirmation of regulated data such as financial account records or medical data.

The Medusa ransomware group claims to have attacked Simon Property Group and lists the case as 'data_published', indicating that exfiltrated data has been released or made available on their leak site. The leak post itself was inaccessible due to a CAPTCHA challenge, so specific details on data volume or type could not be confirmed from the post directly.

high

Data the group says was taken

AI dossier — extracted from the leak post
  • Corporate financial records
  • Employee personally identifiable information (PII)
  • Tenant contracts and lease agreements
  • Internal business communications
  • Legal and compliance documents

What the group claims

Simon Property Group is a leading real estate investment trust (REIT) based in Indianapolis, Indiana. Founded in 1993, it owns, develops, and manages premier shopping malls, outlets, and lifestyle centers across the United States and internationally. The company’s well-known properties include Premium Outlets and The Mills centers. Led by CEO David E. Simon, it focuses on creating high-quality retail and entertainment destinations that attract millions of visitors each year. Despite challenges from online retail, Simon Property Group continues to innovate by combining shopping, dining, and mixed-use spaces, maintaining its position as a global leader in retail real estate. company is headquartered in 225 West Washington Street, Indianapolis, Indiana 46204, USA. 3,000 employees

The leak post

captured from the group's site
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Sources

Source

Indexed 8 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.

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Disclosure context

About Medusa

Medusa, also known as MedusaLocker, is a financially motivated ransomware group that emerged in November 2022 and has since compromised 568 known victims across multiple countries. The group's origin and specific affiliations remain unclear from publicly available intelligence, though their operational patterns suggest they function as an independent ransomware operation rather than a documented Ransomware-as-a-Service model. Medusa primarily targets organizations in the United States, United Kingdom, Canada, Italy, and Australia, with a focus on business services, healthcare, manufacturing, and technology sectors, employing typical ransomware tactics including data encryption and likely exfiltration for double extortion purposes, though specific technical methodologies and initial access vectors have not been extensively documented in public threat intelligence reports. While the group has maintained a relatively high victim count since its emergence, detailed information about specific notable campaigns, high-profile victims, or major ransom demands has not been widely reported by major cybersecurity firms or law enforcement agencies. As of current intelligence assessments, Medusa appears to remain active in the threat landscape, continuing to target organizations across their established geographic and sectoral preferences. The group has been linked to 635 public disclosures across our corpus. First observed on a leak site on November 15, 2022; most recent post May 5, 2026. The operation is currently active.

Also tracked as: MedusaLocker, MEDUSA LOCKER.

Timeline of this disclosure

  • November 7, 2025Simon Property Group listed by Medusaon the group's public leak site
Records
3.000 employees

Other recent disclosures by Medusa

Medusa has been linked to 635 public victims on Darkfield. A sample of the most recent:

See the full Medusa dossier →

Sector and geography

This disclosure adds to ransomware activity in the Financial Services sector, which has 1,184 disclosures indexed across all operators we track. Geographically, Simon Property Group is reported in United States, a country with 11,033 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Medusa means Simon Property Group 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.
  • Report the incident to your national CERT, CISA (United States), as required for your jurisdiction.
  • Monitor for the data appearing on Medusa'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.