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Analyze » ANSSI - Agence nationale de la sécurité des systèmes d'information » ANSFREDIR1781008517

Incident Score: Analysis & Impact (ANSFREDIR1781008517)

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

Rankiteo Score Impact Analysis

Rankiteo Incident Impact-84
Company Score Before Incident704 / 1000
Company Score After Incident620 / 1000
Company LinkView ANSSI - Agence nationale de la sécurité des systèmes d'information Profile
INCIDENT NUMBERANSFREDIR1781008517
Type of Cyber IncidentBreach
ATTACK VECTORCompromised Account (Social Engineering)
DATA EXPOSEDPersonal data, documents, media files,...
INCIDENT DATE06/06/2026
STATUSOngoing

Key Highlights From The Incident Analysis

  • Timeline of ANSSI - Agence nationale de la sécurité des systèmes d'information'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 ANSSI - Agence nationale de la sécurité des systèmes d'information 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 ANSSI - Agence nationale de la sécurité des systèmes d'information breach identified under incident ID ANSFREDIR1781008517.

The analysis begins with a detailed overview of ANSSI - Agence nationale de la sécurité des systèmes d'information's information like the linkedin page: https://www.linkedin.com/company/anssi-fr, the number of followers: 413588, the industry type: Computer and Network Security and the number of employees: 849 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 704 and after the incident was 620 with a difference of -84 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 ANSSI - Agence nationale de la sécurité des systèmes d'information and their customers.

Tchap (DINUM & ANSSI) recently reported "French Government’s Secure Messaging Platform Tchap Breached via Compromised Account", a noteworthy cybersecurity incident.

The French government’s encrypted messaging platform, Tchap, was breached after hackers gained access using a hijacked user account.

The disruption is felt across the environment, affecting Tchap secure messaging platform (Matrix-based), and exposing Personal data, documents, media files, messages, metadata (emails, organizational details, meeting links, device information), with nearly 650,000+ messages, 13.5GB of files records at risk.

In response, teams activated the incident response plan, moved swiftly to contain the threat with measures like Compromised account immediately blocked, and began remediation that includes Ongoing investigation, user advisories against sharing sensitive information in public chat rooms, and stakeholders are being briefed through Public disclosure by DINUM, notification to CNIL.

The case underscores how Ongoing, and recommending next steps like Avoid sharing sensitive information in public chat rooms, review security of shared scripts and credentials, with advisories going out to stakeholders covering Users warned about unencrypted public chat rooms.

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: Spearphishing Link (T1566.001) with moderate to high confidence (80%), supported by evidence indicating attacker claimed access via social engineering on the education shard and Valid Accounts (T1078) with high confidence (90%), supported by evidence indicating hackers gained access using a hijacked user account. Under the Credential Access tactic, the analysis identified Unsecured Credentials: Credentials In Files (T1552.001) with high confidence (90%), supported by evidence indicating hardcoded LDAP credentials from a PowerShell script shared by a French tax authority official and Brute Force (T1110) with moderate confidence (50%), supported by evidence indicating compromised account via social engineering (implied credential misuse). Under the Collection tactic, the analysis identified Data from Local System (T1005) with high confidence (90%), supported by evidence indicating 13.5GB of documents and media files shared by public servants exfiltrated and Data from Information Repositories (T1213) with high confidence (90%), supported by evidence indicating nearly 650,000 messages and metadata from 73,000+ accounts accessed. Under the Exfiltration tactic, the analysis identified Exfiltration Over C2 Channel (T1041) with moderate to high confidence (80%), supported by evidence indicating attacker claimed exfiltration of 13.5GB of files and 650,000 messages and Transfer Data to Cloud Account (T1537) with moderate confidence (60%), supported by evidence indicating files shared on Tchap were downloadable without authentication. Under the Defense Evasion tactic, the analysis identified Hide Artifacts: Hidden Files and Directories (T1564.001) with moderate confidence (50%), supported by evidence indicating public chat rooms unencrypted and accessible to any user and Valid Accounts (T1078) with moderate to high confidence (80%), supported by evidence indicating accessed platform through a compromised account. Under the Discovery tactic, the analysis identified Account Discovery (T1087) with moderate to high confidence (70%), supported by evidence indicating metadata from 73,000+ accounts, including emails and organizational details and File and Directory Discovery (T1083) with moderate to high confidence (80%), supported by evidence indicating 13.5GB of documents and media files exfiltrated. These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.

Initial Access
Phishing: Spearphishing Link (80%)
Valid Accounts (90%)
Credential Access
Unsecured Credentials: Credentials In Files (90%)
Brute Force (50%)
Collection
Data from Local System (90%)
Data from Information Repositories (90%)
Exfiltration
Exfiltration Over C2 Channel (80%)
Transfer Data to Cloud Account (60%)
Defense Evasion
Hide Artifacts: Hidden Files and Directories (50%)
Valid Accounts (80%)
Discovery
Account Discovery (70%)
File and Directory Discovery (80%)

Sources & References