Greystar Breach Incident Score: Analysis & Impact (GRETHE1773872875)

In this Rankiteo incident briefing, we review the Greystar breach identified under incident ID GRETHE1773872875.

The analysis begins with a detailed overview of Greystar's information like the linkedin page: https://www.linkedin.com/company/greystar, the number of followers: 435047, the industry type: Real Estate and the number of employees: 18572 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 790 and after the incident was 699 with a difference of -91 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 Greystar and their customers.

On 24 October 2025, Greenhouse Apartments disclosed Ransomware issues under the banner "Greenhouse Apartments Data Breach Under Investigation After SAFEPAY Ransomware Attack".

A cybersecurity incident at Greenhouse Apartments, a 489-unit pet-friendly community in Kennesaw, Georgia, has exposed the sensitive personal data of 3,473 individuals across the U.S., including six residents of Maine.

The disruption is felt across the environment, and exposing Sensitive personal data, with nearly 3,473 records at risk.

In response, and stakeholders are being briefed through Breach notifications mailed to affected individuals.

The case underscores how Under investigation, with advisories going out to stakeholders covering Breach notifications mailed on 2026-03-13.

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 Exploit Public-Facing Application (T1190) with moderate confidence (50%), supported by evidence indicating unauthorized access between September 20–21, 2025 and Valid Accounts (T1078) with moderate confidence (60%), supported by evidence indicating property management systems targeted (likely credential abuse). Under the Execution tactic, the analysis identified User Execution: Malicious File (T1204.002) with moderate to high confidence (70%), supported by evidence indicating sAFEPAY ransomware group claimed responsibility. Under the Credential Access tactic, the analysis identified Brute Force (T1110) with moderate confidence (50%), supported by evidence indicating unauthorized access to property management systems and Unsecured Credentials: Credentials In Files (T1552.001) with lower confidence (40%), supported by evidence indicating sensitive personal data exposed (potential credential storage). Under the Discovery tactic, the analysis identified Account Discovery (T1087) with moderate confidence (60%), supported by evidence indicating 3,473 individuals data compromised (targeted reconnaissance). Under the Collection tactic, the analysis identified Data from Local System (T1005) with moderate to high confidence (80%), supported by evidence indicating sensitive personal data of 3,473 individuals exposed. Under the Exfiltration tactic, the analysis identified Exfiltration Over C2 Channel (T1041) with moderate to high confidence (70%), supported by evidence indicating sAFEPAY ransomware group publicly posted about attack on dark web. Under the Impact tactic, the analysis identified Data Encrypted for Impact (T1486) with moderate to high confidence (80%), supported by evidence indicating sAFEPAY ransomware attack (implied encryption) and Defacement (T1491) with moderate confidence (60%), supported by evidence indicating ransomware group publicly posted about attack on dark web. These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.