Incident Score: Analysis & Impact (YASFRE1769690560)
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Rankiteo Score Impact Analysis
Key Highlights From The Incident Analysis
- Timeline of FreePBX's Vulnerability 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 FreePBX 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 FreePBX breach identified under incident ID YASFRE1769690560.
The analysis begins with a detailed overview of FreePBX's information like the linkedin page: https://www.linkedin.com/company/freepbx, the number of followers: 879, the industry type: Telecommunications and the number of employees: None 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 750 with a difference of -3 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 FreePBX and their customers.
On 01 December 2025, Indian technology firm (unnamed) disclosed Webshell Deployment issues under the banner "Sophisticated FreePBX Attack Campaign Deploys Persistent 'EncystPHP' Webshell".
A financially motivated hacker group, INJ3CTOR3, has launched a targeted attack campaign exploiting CVE-2025-64328, a critical post-authentication command-injection vulnerability in FreePBX’s Endpoint Manager.
The disruption is felt across the environment, affecting VoIP and PBX systems, plus an estimated financial loss of Toll fraud.
Formal response steps have not been shared publicly yet.
Overall, the incident is a reminder of why proactive monitoring and strong governance matter.
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 high confidence (90%), supported by evidence indicating exploiting CVE-2025-64328, a critical post-authentication command-injection vulnerability in FreePBX’s Endpoint Manager and Valid Accounts (T1078) with moderate to high confidence (80%), supported by evidence indicating post-authentication command-injection vulnerability in FreePBX’s Endpoint Manager. Under the Execution tactic, the analysis identified Command and Scripting Interpreter: Unix Shell (T1059.004) with high confidence (90%), supported by evidence indicating execute arbitrary commands as the *asterisk* user via check_ssh_connect() function and Exploitation for Client Execution (T1203) with moderate to high confidence (80%), supported by evidence indicating encystPHP dropper downloaded from 45.234.176.202. Under the Persistence tactic, the analysis identified Server Software Component: Web Shell (T1505.003) with high confidence (100%), supported by evidence indicating encystPHP webshell disguised as ajax.php, deployed in /var/www/html/, Scheduled Task/Job: Cron (T1053.003) with high confidence (90%), supported by evidence indicating multi-stage persistence via cron jobs, and Create Account: Local Account (T1136.001) with high confidence (90%), supported by evidence indicating creates a root-level newfpbx account for backdoor access. Under the Privilege Escalation tactic, the analysis identified Valid Accounts (T1078) with high confidence (90%), supported by evidence indicating root-level newfpbx account created, resets user passwords and Abuse Elevation Control Mechanism: Setuid and Setgid (T1548.001) with moderate to high confidence (70%), supported by evidence indicating arbitrary commands executed as the *asterisk* user. Under the Defense Evasion tactic, the analysis identified Masquerading: Match Legitimate Name or Location (T1036.005) with high confidence (90%), supported by evidence indicating webshell disguised as ajax.php, forged timestamps to evade detection, Impair Defenses: Disable or Modify Tools (T1562.001) with moderate to high confidence (80%), supported by evidence indicating disables error logging, modifies file permissions, and Indicator Removal: File Deletion (T1070.004) with moderate to high confidence (70%), supported by evidence indicating removes competing malware. Under the Credential Access tactic, the analysis identified Brute Force: Password Cracking (T1110.002) with moderate to high confidence (70%), supported by evidence indicating resets user passwords for privilege escalation and Unsecured Credentials: Private Keys (T1552.004) with moderate to high confidence (80%), supported by evidence indicating injects SSH keys for backdoor access. Under the Discovery tactic, the analysis identified Account Discovery: Local Account (T1087.001) with moderate to high confidence (80%), supported by evidence indicating enumerates SIP peers, Asterisk channels and Network Service Discovery (T1046) with moderate to high confidence (70%), supported by evidence indicating targets cloud-based VoIP environments. Under the Collection tactic, the analysis identified Automated Collection (T1119) with moderate to high confidence (70%), supported by evidence indicating interactive Ask Master interface for remote command execution. Under the Command and Control tactic, the analysis identified Application Layer Protocol: Web Protocols (T1071.001) with high confidence (90%), supported by evidence indicating encystPHP webshell uses MD5-hashed authentication, C2 via crm.razatelefonia.pro and Ingress Tool Transfer (T1105) with moderate to high confidence (80%), supported by evidence indicating downloaded EncystPHP dropper from 45.234.176.202. Under the Impact tactic, the analysis identified Resource Hijacking (T1496) with high confidence (90%), supported by evidence indicating initiates unauthorized calls for toll fraud and System Shutdown/Reboot (T1529) with moderate confidence (50%), supported by evidence indicating full administrative control over compromised systems. These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.
Sources & References
- FreePBX Rankiteo Cyber Incident Details: https://www.rankiteo.com/company/freepbx/incident/YASFRE1769690560
- FreePBX CyberSecurity Rating page: https://www.rankiteo.com/company/freepbx
- FreePBX Rankiteo Cyber Incident Blog Article: https://blog.rankiteo.com/yasfre1769690560-freepbx-indian-technology-firm-vulnerability-december-2025/
- FreePBX CyberSecurity Score History: https://www.rankiteo.com/company/freepbx/history
- FreePBX CyberSecurity Incident Source: https://cybersecuritynews.com/freepbx-vulnerability-exploited/
- 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