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Analyze » Builders FirstSource » BUI1774909946

Incident Score: Analysis & Impact (BUI1774909946)

The details regarding individual company incidents & reports gives you full view from every side.

Rankiteo Score Impact Analysis

Rankiteo Incident Impact-49
Company Score Before Incident775 / 1000
Company Score After Incident726 / 1000
Company LinkView Builders FirstSource Profile
INCIDENT NUMBERBUI1774909946
Type of Cyber IncidentBreach
ATTACK VECTORNA
DATA EXPOSEDProtected Health Information (PHI)
INCIDENT DATE29/12/2025
STATUSpublished

Key Highlights From The Incident Analysis

  • Timeline of Builders FirstSource'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 Builders FirstSource 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 Builders FirstSource breach identified under incident ID BUI1774909946.

The analysis begins with a detailed overview of Builders FirstSource's information like the linkedin page: https://www.linkedin.com/company/builders-firstsource, the number of followers: 89819, the industry type: Wholesale Building Materials and the number of employees: 11723 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 775 and after the incident was 726 with a difference of -49 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 Builders FirstSource and their customers.

On 18 February 2026, Builders FirstSource Flex Plan disclosed Data Breach issues under the banner "Builders FirstSource Flex Plan Data Breach".

Builders FirstSource Flex Plan, a U.S.-based entity linked to building materials supplier Builders FirstSource Inc., disclosed a data breach impacting 1,514 individuals.

The disruption is felt across the environment, and exposing Protected Health Information (PHI), with nearly 1514 records at risk.

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

The case underscores how with advisories going out to stakeholders covering Affected individuals notified via mail; others advised to contact the company if impacted.

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 (T1078) with moderate confidence (60%), supported by evidence indicating unauthorized access began, how long it persisted, or when detected and Exploit Public-Facing Application (T1190) with moderate confidence (50%), supported by evidence indicating no details on attack vector or vulnerability exploited. Under the Credential Access tactic, the analysis identified Unsecured Credentials (T1552) with moderate confidence (60%), supported by evidence indicating protected Health Information (PHI) was compromised and OS Credential Dumping (T1003) with moderate confidence (50%), supported by evidence indicating no specifics on how credentials were obtained. Under the Collection tactic, the analysis identified Data from Local System (T1005) with moderate to high confidence (80%), supported by evidence indicating protected Health Information (PHI) was compromised and Data from Information Repositories (T1213) with moderate to high confidence (70%), supported by evidence indicating data breach impacting 1,514 individuals. Under the Exfiltration tactic, the analysis identified Exfiltration Over C2 Channel (T1041) with moderate to high confidence (80%), supported by evidence indicating leaknet threatened to release the stolen data on the dark web and Exfiltration Over Web Service (T1567) with moderate to high confidence (70%), supported by evidence indicating data exfiltration threatened by Leaknet. Under the Impact tactic, the analysis identified Data Destruction (T1485) with lower confidence (40%), supported by evidence indicating no details on malware or data destruction and Data Manipulation (T1565) with lower confidence (30%), supported by evidence indicating no evidence of data manipulation, but PHI was exposed. These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.

Initial Access
Valid Accounts (60%)
Exploit Public-Facing Application (50%)
Credential Access
Unsecured Credentials (60%)
OS Credential Dumping (50%)
Collection
Data from Local System (80%)
Data from Information Repositories (70%)
Exfiltration
Exfiltration Over C2 Channel (80%)
Exfiltration Over Web Service (70%)
Impact
Data Destruction (40%)
Data Manipulation (30%)

Sources & References