Incident Score: Analysis & Impact (IDXNEL1773347617)
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Rankiteo Score Impact Analysis
Key Highlights From The Incident Analysis
- Timeline of NELSON Worldwide's Cyber Attack and lateral movement inside company's environment.
- Overview of affected data sets, including SSNs and PHI, and why they materially increase incident severity.
- How Rankiteo’s incident engine converts technical details into a normalized incident score.
- How this cyber incident impacts NELSON Worldwide Rankiteo cyber scoring and cyber rating.
- Rankiteo’s MITRE ATT&CK correlation analysis for this incident, with associated confidence level.
Full Incident Analysis Transcript
In this Rankiteo incident briefing, we review the NELSON Worldwide breach identified under incident ID IDXNEL1773347617.
The analysis begins with a detailed overview of NELSON Worldwide's information like the linkedin page: https://www.linkedin.com/company/nelsonworldwide, the number of followers: 32083, the industry type: Design Services and the number of employees: 1006 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 757 and after the incident was 740 with a difference of -17 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 NELSON Worldwide and their customers.
On 06 March 2026, Nelson Worldwide, LLC disclosed Ransomware issues under the banner "Nelson Worldwide Hit by CHAOS Ransomware Attack, Exposing Sensitive Data".
On February 18, 2026, Nelson Worldwide, LLC, a global design and architecture firm, suffered a ransomware attack that compromised its network.
The disruption is felt across the environment, and exposing 400 GB of data.
In response, and stakeholders are being briefed through Guidance on reviewing credit reports, placing fraud alerts, and securing health information.
The case underscores how Concluded on February 25, 2026, with advisories going out to stakeholders covering Complimentary credit monitoring and identity protection services through IDX, including credit and CyberScan monitoring, $1 million in identity theft insurance, and managed identity recovery.
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.
MITRE ATT&CK® Correlation Analysis
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 suffered a ransomware attack that compromised its network and Valid Accounts (T1078) with moderate confidence (60%), supported by evidence indicating network compromise suggests possible valid account misuse. Under the Execution tactic, the analysis identified Ransomware execution via malicious payload (T1204.002) with moderate to high confidence (70%), supported by evidence indicating cHAOS ransomware attack. Under the Credential Access tactic, the analysis identified OS Credential Dumping (T1003) with moderate confidence (60%), supported by evidence indicating pII and PHI data compromised, including SSNs and financial data. Under the Collection tactic, the analysis identified Data from Local System (T1005) with high confidence (90%), supported by evidence indicating 400 GB of data exfiltrated, including PII and PHI and Data from Information Repositories (T1213) with moderate to high confidence (80%), supported by evidence indicating medical records and financial account data compromised. Under the Exfiltration tactic, the analysis identified Exfiltration Over C2 Channel (T1041) with high confidence (90%), supported by evidence indicating 400 GB of data exfiltrated by CHAOS group and Exfiltration Over Web Service (T1567) with moderate to high confidence (70%), supported by evidence indicating breach announced on the dark web. Under the Impact tactic, the analysis identified Data Encrypted for Impact (T1486) with moderate to high confidence (80%), supported by evidence indicating cHAOS ransomware attack and Defacement (T1491) with moderate confidence (50%), supported by evidence indicating breach announced on the dark web by CHAOS. Under the Defense Evasion tactic, the analysis identified Obfuscated Files or Information (T1027) with moderate to high confidence (70%), supported by evidence indicating ransomware attack suggests evasion of defenses and Impair Defenses: Disable or Modify Tools (T1562.001) with moderate confidence (60%), supported by evidence indicating network compromise indicates possible defense impairment. These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.
Sources & References
- NELSON Worldwide Rankiteo Cyber Incident Details: https://www.rankiteo.com/company/nelsonworldwide/incident/IDXNEL1773347617
- NELSON Worldwide CyberSecurity Rating page: https://www.rankiteo.com/company/nelsonworldwide
- NELSON Worldwide Rankiteo Cyber Incident Blog Article: https://blog.rankiteo.com/idxnel1773347617-idx-nelson-worldwide-llc-cyber-attack-february-2026/
- NELSON Worldwide CyberSecurity Score History: https://www.rankiteo.com/company/nelsonworldwide/history
- NELSON Worldwide CyberSecurity Incident Source: https://www.claimdepot.com/data-breach/nelson-worldwide-2026
- Rankiteo A.I CyberSecurity Rating methodology: https://www.rankiteo.com/Images/rankiteo_algo.pdf
- Rankiteo TPRM Scoring methodology: https://static.rankiteo.com/model/rankiteo_tprm_methodology.pdf