Prosper Marketplace Breach Incident Score: Analysis & Impact (PRO1765994381)

In this Rankiteo incident briefing, we review the Prosper Marketplace breach identified under incident ID PRO1765994381.

The analysis begins with a detailed overview of Prosper Marketplace's information like the linkedin page: https://www.linkedin.com/company/prosper-marketplace, the number of followers: 19030, the industry type: Financial Services and the number of employees: 483 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 275 and after the incident was 150 with a difference of -125 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 Prosper Marketplace and their customers.

Prosper Marketplace recently reported "Prosper Marketplace Cybersecurity Incident and 700Credit Data Exposure", a noteworthy cybersecurity incident.

Two recent cybersecurity incidents involving financial services providers have exposed the personal information of millions of individuals.

The disruption is felt across the environment, and exposing Sensitive personal and financial data, including names, Social Security numbers, national ID numbers, dates of birth, bank account numbers, Prosper account numbers, financial application details, driver’s license numbers, passports, tax information, and payment card numbers (Prosper); names, Social Security numbers, dates of birth, and physical addresses (700Credit), with nearly ['13,100,000 (Prosper)', '5,836,521 (700Credit)'] records at risk.

In response, teams activated the incident response plan, moved swiftly to contain the threat with measures like Unauthorized activity stopped, additional security and monitoring controls deployed (Prosper); unauthorized access identified and contained (700Credit), and began remediation that includes Enhanced security measures, credit monitoring and identity restoration services offered (Prosper); credit monitoring services offered (700Credit), and stakeholders are being briefed through Official notices issued, affected individuals notified, regulatory filings submitted.

The case underscores how Ongoing, teams are taking away lessons such as Financial services providers and fintech companies are increasingly targeted for the volume and sensitivity of data they hold. Enhanced monitoring and rapid incident response are critical to mitigating risks, and recommending next steps like Affected individuals should monitor their credit reports, report suspicious activity, and utilize offered credit monitoring services. Companies should strengthen security controls and ensure compliance with regulatory requirements, with advisories going out to stakeholders covering Dealers advised to consult legal counsel for state-level breach notification compliance (700Credit).

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 unauthorized activity detected on its systems between June and August 2025 and Exploit Public-Facing Application (T1190) with moderate confidence (50%), supported by evidence indicating persistent vulnerabilities in the fintech and credit reporting sectors. Under the Credential Access tactic, the analysis identified Unsecured Credentials (T1552) with moderate confidence (60%), supported by evidence indicating access to sensitive data including bank account details and payment card numbers. Under the Collection tactic, the analysis identified Data from Information Repositories (T1213) with moderate to high confidence (80%), supported by evidence indicating attackers accessed sensitive data including SSNs, bank details, and tax info. Under the Exfiltration tactic, the analysis identified Exfiltration Over C2 Channel (T1041) with high confidence (90%), with evidence including attackers made copies of data in 700Credit incident, and data exfiltration such as Yes and Automated Exfiltration (T1020) with moderate to high confidence (70%), supported by evidence indicating 13.1M and 5.8M records exposed in large-scale breaches. Under the Impact tactic, the analysis identified Data Encrypted for Impact (T1486) with lower confidence (30%), supported by evidence indicating no evidence of ransomware or data encryption mentioned and Data Manipulation: Stored Data Manipulation (T1565.001) with lower confidence (40%), supported by evidence indicating no evidence of data manipulation, but high identity theft risk. These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.