Marquis Companies Breach Incident Score: Analysis & Impact (MAR1765824544)

In this Rankiteo incident briefing, we review the Marquis Companies breach identified under incident ID MAR1765824544.

The analysis begins with a detailed overview of Marquis Companies's information like the linkedin page: https://www.linkedin.com/company/marquis-companies, the number of followers: 7750, the industry type: Hospitals and Health Care and the number of employees: 969 employees

After the initial compromise, the video explains how Rankiteo's incident engine converts technical details into a normalized incident score. The incident score before the incident was 765 and after the incident was 664 with a difference of -101 which is could be a good indicator of the severity and impact of the incident.

In the next step of the video, we will analyze in more details the incident and the impact it had on Marquis Companies and their customers.

On 21 November 2025, Marquis Companies disclosed Ransomware Attack issues under the banner "Marquis Companies Data Breach and Ransomware Attack".

Marquis Companies, a leading provider in the hospital and health care industry, experienced a significant data breach involving personally identifiable information (PII) and protected health information (PHI) of current and former residents.

The disruption is felt across the environment, and exposing Personally identifiable information (PII) and protected health information (PHI).

In response, teams activated the incident response plan, and began remediation that includes Internal investigation and system security assessment, and stakeholders are being briefed through Formal notification to impacted individuals by mail on Nov. 21, 2025.

The case underscores how Ongoing, with advisories going out to stakeholders covering Formal notification to impacted individuals by mail on Nov. 21, 2025.

Finally, we try to match the incident with the MITRE ATT&CK framework to see if there is any correlation between the incident and the MITRE ATT&CK framework.

The MITRE ATT&CK framework is a knowledge base of techniques and sub-techniques that are used to describe the tactics and procedures of cyber adversaries. It is a powerful tool for understanding the threat landscape and for developing effective defense strategies.

Rankiteo's analysis has identified several MITRE ATT&CK tactics and techniques associated with this incident, each with varying levels of confidence based on available evidence. Under the Initial Access tactic, the analysis identified Valid Accounts (T1078) with moderate to high confidence (70%), supported by evidence indicating lYNX ransomware group infiltrated Marquis Companies’ network and Exploit Public-Facing Application (T1190) with moderate confidence (50%), supported by evidence indicating attack vector and vulnerability exploited not specified. Under the Credential Access tactic, the analysis identified Unsecured Credentials (T1552) with moderate confidence (60%), supported by evidence indicating network infiltration suggests possible credential compromise. Under the Exfiltration tactic, the analysis identified Exfiltration Over C2 Channel (T1041) with high confidence (90%), supported by evidence indicating lYNX exfiltrated sensitive data before encrypting systems and Transfer Data to Cloud Account (T1537) with moderate confidence (50%), supported by evidence indicating data later posted on the dark web by LYNX group. Under the Impact tactic, the analysis identified Data Encrypted for Impact (T1486) with high confidence (95%), supported by evidence indicating lYNX ransomware encrypted systems after data exfiltration and Data Manipulation: Runtime Data Manipulation (T1565.003) with lower confidence (40%), supported by evidence indicating ransomware attack may involve system manipulation. Under the Defense Evasion tactic, the analysis identified Obfuscated Files or Information (T1027) with moderate to high confidence (70%), supported by evidence indicating ransomware likely used obfuscation to evade detection and Impair Defenses: Disable or Modify Tools (T1562.001) with moderate confidence (60%), supported by evidence indicating attackers may have disabled security tools during infiltration. These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.