D. E. Systems Ltd. Breach Incident Score: Analysis & Impact (D--1765844138)

In this Rankiteo incident briefing, we review the D. E. Systems Ltd. breach identified under incident ID D--1765844138.

The analysis begins with a detailed overview of D. E. Systems Ltd.'s information like the linkedin page: https://www.linkedin.com/company/d--e--systems-ltd-, the number of followers: 405, the industry type: Events Services and the number of employees: 25 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 758 and after the incident was 691 with a difference of -67 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 D. E. Systems Ltd. and their customers.

On 15 December 2025, Event Rental Systems (ERS) disclosed Data Breach issues under the banner "ERS Cybersecurity Incident and Data Breach".

An unauthorized person inserted unauthorized code into certain modules of ERS’s customers’ websites and may have acquired records containing personally identifiable information (PII), including contact information, payment card numbers, CVV, and expiration dates.

The disruption is felt across the environment, affecting ERS customers’ websites, and exposing Personally identifiable information (PII), payment card details (number, CVV, expiration date).

In response, and stakeholders are being briefed through Public disclosure via press release.

The case underscores how Ongoing (Lynch Carpenter LLP investigation), with advisories going out to stakeholders covering Individuals impacted may be entitled to compensation; advised to contact Lynch Carpenter LLP.

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 to high confidence (80%), supported by evidence indicating attacker injected malicious code into certain modules of ERS’s customer websites. Under the Collection tactic, the analysis identified Data from Information Repositories (T1213) with moderate to high confidence (70%), supported by evidence indicating compromising sensitive information...payment card numbers, CVV codes, and expiration dates. Under the Exfiltration tactic, the analysis identified Exfiltration Over C2 Channel (T1041) with moderate to high confidence (70%), supported by evidence indicating may have acquired records containing PII...data exfiltration such as Possible. Under the Impact tactic, the analysis identified Data Encrypted for Impact (T1486) with lower confidence (30%), supported by evidence indicating data encryption such as null (but high-risk payment data exposed) and Data Manipulation: Stored Data Manipulation (T1565.001) with moderate confidence (60%), supported by evidence indicating unauthorized code insertion into ERS customers’ websites modules. These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.