Incident Score: Analysis & Impact (KIE1787783299)
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Rankiteo Score Impact Analysis
Key Highlights From The Incident Analysis
- Timeline of Kiewit's Breach 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 Kiewit 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 Kiewit breach identified under incident ID KIE1787783299.
The analysis begins with a detailed overview of Kiewit's information like the linkedin page: https://www.linkedin.com/company/kiewit, the number of followers: 1148099, the industry type: Construction and the number of employees: 26728 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 801 and after the incident was 757 with a difference of -44 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 Kiewit and their customers.
On 26 August 2026, Kiewit Corporation disclosed Data Breach issues under the banner "Kiewit Corporation Data Breach Exposes Sensitive Employee and Contractor Information".
Unauthorized access to an employee’s Microsoft 365 account at Kiewit Corporation led to the potential compromise of personal data of current and former employees and independent contractors.
The disruption is felt across the environment, affecting Microsoft 365 account, and exposing Sensitive personal and employment-related information.
In response, teams activated the incident response plan, moved swiftly to contain the threat with measures like Forced password reset and Account disablement, and stakeholders are being briefed through Breach notifications sent to affected individuals.
The case underscores how Ongoing, with advisories going out to stakeholders covering Breach notifications sent to affected individuals.
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 Valid Accounts: Cloud Accounts (T1078.004) with high confidence (90%), supported by evidence indicating unauthorized access to an employee’s Microsoft 365 account. Under the Credential Access tactic, the analysis identified Brute Force: Password Guessing (T1110.001) with moderate confidence (60%), supported by evidence indicating suspicious activity in an employee’s account (implied unauthorized access) and Unsecured Credentials: Cloud Credentials (T1552.006) with moderate to high confidence (70%), supported by evidence indicating microsoft 365 account compromise (no MFA or weak credentials implied). Under the Collection tactic, the analysis identified Data from Local System (T1005) with moderate to high confidence (80%), supported by evidence indicating social Security numbers, addresses, employment-related health information. Under the Exfiltration tactic, the analysis identified Exfiltration Over C2 Channel (T1041) with moderate to high confidence (70%), supported by evidence indicating potential compromise of personal data (implied exfiltration). Under the Impact tactic, the analysis identified Data Manipulation: Stored Data Manipulation (T1565.001) with moderate confidence (50%), supported by evidence indicating unauthorized access to sensitive employee data (risk of tampering) and Data Destruction (T1485) with lower confidence (30%), supported by evidence indicating no details on extent of breach (potential destruction risk). Under the Defense Evasion tactic, the analysis identified Impair Defenses: Disable or Modify Tools (T1562.001) with moderate confidence (50%), supported by evidence indicating account disablement as containment (implied prior evasion). These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.
Sources & References
- Kiewit Rankiteo Cyber Incident Details: https://www.rankiteo.com/company/kiewit/incident/KIE1787783299
- Kiewit CyberSecurity Rating page: https://www.rankiteo.com/company/kiewit
- Kiewit Rankiteo Cyber Incident Blog Article: https://blog.rankiteo.com/kie1787783299-kiewit-corporation-breach-july-2026/
- Kiewit CyberSecurity Score History: https://www.rankiteo.com/company/kiewit/history
- Kiewit CyberSecurity Incident Source: https://www.morningstar.com/news/pr-newswire/20260826ph34704/kiewit-corporation-data-breach-alert-edelson-lechtzin-llp-investigates-exposure-of-employee-and-contractor-personal-information
- 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