Incident Score: Analysis & Impact (ONC1780598011)
The details regarding individual company incidents & reports gives you full view from every side.
Rankiteo Score Impact Analysis
Key Highlights From The Incident Analysis
- Timeline of OnCall'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 OnCall 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 OnCall breach identified under incident ID ONC1780598011.
The analysis begins with a detailed overview of OnCall's information like the linkedin page: https://www.linkedin.com/company/oncall-llc, the number of followers: 7372, the industry type: Pharmaceutical Manufacturing and the number of employees: 202 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 753 and after the incident was 688 with a difference of -65 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 OnCall and their customers.
On 28 May 2026, Manager on Call LLC disclosed Data Breach issues under the banner "Manager on Call LLC Phishing-Driven W-2 Data Breach".
Human resources consulting firm Manager on Call LLC reported a data breach stemming from a sophisticated email phishing attack that exposed sensitive W-2 tax information of employees.
The disruption is felt across the environment, and exposing W-2 tax information, full names, home addresses, 2025 wage details, Social Security numbers, with nearly 5 records at risk.
In response, and began remediation that includes Offering complimentary credit monitoring and identity theft restoration services to affected individuals, and stakeholders are being briefed through Notifications sent to affected individuals on May 28, 2026, with follow-up emails for enrollment details.
The case underscores how with advisories going out to stakeholders covering Affected individuals notified on May 28, 2026, with follow-up emails for enrollment in credit monitoring services.
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 Phishing (T1566) with high confidence (90%), with evidence including sophisticated email phishing attack, and display name spoofing to impersonate CEO and Phishing: Spearphishing Link (T1566.002) with moderate to high confidence (80%), supported by evidence indicating fraudulent but urgent request to staff operations team. Under the Credential Access tactic, the analysis identified Gather Victim Identity Information: Email Addresses (T1589.002) with moderate to high confidence (70%), supported by evidence indicating impersonate Manager on Call CEO Cristina Heta. Under the Execution tactic, the analysis identified User Execution (T1204) with high confidence (90%), supported by evidence indicating contractors bypassed secure data transfer protocols and User Execution: Malicious Link (T1204.001) with moderate to high confidence (80%), supported by evidence indicating believing the email was legitimate, contractors sent W-2 files. Under the Collection tactic, the analysis identified Data from Local System (T1005) with high confidence (90%), supported by evidence indicating w-2 files sent directly to the attacker and Data from Information Repositories (T1213) with moderate to high confidence (80%), supported by evidence indicating exposed data included full names, SSNs, wage details. Under the Exfiltration tactic, the analysis identified Exfiltration Over C2 Channel (T1041) with moderate to high confidence (80%), supported by evidence indicating w-2 files sent directly to the attacker. Under the Impact tactic, the analysis identified Compromise Accounts: Email Accounts (T1586.002) with moderate to high confidence (70%), supported by evidence indicating display name spoofing to impersonate CEO and Data Destruction (T1485) with lower confidence (30%), supported by evidence indicating heightening risks of tax fraud and identity theft. These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.
Sources & References
- OnCall Rankiteo Cyber Incident Details: https://www.rankiteo.com/company/oncall-llc/incident/ONC1780598011
- OnCall CyberSecurity Rating page: https://www.rankiteo.com/company/oncall-llc
- OnCall Rankiteo Cyber Incident Blog Article: https://blog.rankiteo.com/onc1780598011-manager-on-call-llc-breach-may-2026/
- OnCall CyberSecurity Score History: https://www.rankiteo.com/company/oncall-llc/history
- OnCall CyberSecurity Incident Source: https://www.claimdepot.com/data-breach/manager-on-call-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