Incident Score: Analysis & Impact (VIV1772331885)
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Rankiteo Score Impact Analysis
Key Highlights From The Incident Analysis
- Timeline of Vivacom'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 Vivacom 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 Vivacom breach identified under incident ID VIV1772331885.
The analysis begins with a detailed overview of Vivacom's information like the linkedin page: https://www.linkedin.com/company/vivacom, the number of followers: 21448, the industry type: Telecommunications and the number of employees: 2262 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 761 and after the incident was 742 with a difference of -19 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 Vivacom and their customers.
On 22 September 2024, Vivacom disclosed Cyberattack issues under the banner "United Group Subsidiaries Hit by Cyberattack in Bulgaria".
On the evening of Monday, 22 September, United Group confirmed that two of its Bulgarian subsidiaries Vivacom and Mainstream Bulgaria were targeted in a malicious cyberattack by external threat actors.
The disruption is felt across the environment, affecting Business client systems.
In response, teams activated the incident response plan, moved swiftly to contain the threat with measures like Swift containment, and began remediation that includes Full system recovery and network review, while recovery efforts such as Restoration efforts continue, and stakeholders are being briefed through Updates to be provided as the situation develops.
The case underscores how Underway, and recommending next steps like Strengthening security and resilience across markets.
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%), with evidence including malicious cyberattack by external threat actors, and some business clients may experience temporary technical disruptions and Trusted Relationship (T1199) with lower confidence (40%), supported by evidence indicating united Group subsidiaries Vivacom & Mainstream Bulgaria targeted. Under the Execution tactic, the analysis identified Exploitation for Client Execution (T1203) with moderate confidence (50%), with evidence including malicious cyberattack, and temporary technical disruptions as restoration efforts continue. Under the Impact tactic, the analysis identified Endpoint Denial of Service (T1499) with moderate to high confidence (70%), with evidence including temporary technical disruptions to business clients, and criminal attempt to disrupt operations and Defacement (T1491) with lower confidence (30%), supported by evidence indicating disrupt operations and exploit businesses for financial gain. Under the Credential Access tactic, the analysis identified Brute Force (T1110) with lower confidence (40%), with evidence including external threat actors, and financial gain motivation. Under the Defense Evasion tactic, the analysis identified Valid Accounts (T1078) with moderate confidence (50%), supported by evidence indicating swiftly contained with support of cybersecurity specialists and Impair Defenses: Disable or Modify Tools (T1562.001) with lower confidence (40%), supported by evidence indicating temporary technical disruptions as restoration efforts continue. Under the Exfiltration tactic, the analysis identified Exfiltration Over C2 Channel (T1041) with moderate confidence (60%), supported by evidence indicating criminal attempt to disrupt operations and exploit businesses for financial gain. These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.
Sources & References
- Vivacom Rankiteo Cyber Incident Details: https://www.rankiteo.com/company/vivacom/incident/VIV1772331885
- Vivacom CyberSecurity Rating page: https://www.rankiteo.com/company/vivacom
- Vivacom Rankiteo Cyber Incident Blog Article: https://blog.rankiteo.com/viv1772331885-vivacom-cyber-attack-september-2025/
- Vivacom CyberSecurity Score History: https://www.rankiteo.com/company/vivacom/history
- Vivacom CyberSecurity Incident Source: https://www.thefastmode.com/technology-solutions/44820-united-group-subsidiaries-vivacom-mainstream-bulgaria-hit-by-cyberattack
- 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