Log analysis and intrusion detection

Why is log analysis crucial?

Log files (event logs) are the memory of your IT infrastructure. They record every action, every connection, every error and every anomaly occurring on your servers, applications and network equipment. The methodical analysis of these logs is essential to detect intrusions, identify malicious behavior and understand the root cause of security incidents.

However, the massive volume of data generated daily makes manual analysis practically impossible. This is where our expertise comes in: we combine advanced automated analysis tools with deep human expertise to extract critical information and identify the weak signals that could indicate a compromise of your system.

Our log analysis services

Real-time security monitoring

Our monitoring service continuously watches your systems to detect suspicious activity and intrusion attempts. We analyze, in real time, the logs from your firewalls, web servers, authentication systems, databases and critical applications to immediately identify any abnormal behavior.

Alerts are configured according to sophisticated correlation rules that reduce false positives while ensuring that no real threat goes unnoticed. Our team reviews every alert to determine its severity and recommend the appropriate actions.

Intrusion detection (IDS/IPS)

We deploy and manage intrusion detection and prevention systems (IDS/IPS) that perform deep analysis of network traffic to identify known attack signatures and behavioral anomalies. These systems can automatically block intrusion attempts while documenting the incident for later analysis.

Our approach combines signature-based detection (known attacks) and anomaly-based detection (unusual behavior) for maximum protection against emerging threats and zero-day attacks.

Post-incident forensic analysis

In the event of a confirmed or suspected security incident, our team performs in-depth forensic analysis of the logs to reconstruct the timeline of events, identify the initial attack vector, determine the extent of the compromise and collect the evidence needed for any potential legal action.

We use specialized forensic analysis tools and recognized methodologies to preserve the integrity of evidence while extracting the critical information that will help understand the incident and prevent its recurrence.

Event correlation and SIEM

SIEM (Security Information and Event Management) systems centralize and correlate logs from multiple sources to provide an overall view of your security posture. We configure, optimize and manage SIEM solutions tailored to your environment.

Event correlation makes it possible to detect complex attack scenarios that would be invisible when analyzing a single log source in isolation. For example, a failed login attempt followed by a privilege escalation and access to sensitive data is a suspicious pattern that correlation can reveal.

Types of events analyzed

• Login attempts: Failed authentications, access from suspicious IPs, connections at unusual hours
• Network activity: Port scans, exploitation attempts, communications with known malicious IPs
• System changes: Configuration changes, software installation, user account creation
• Data access: Bulk downloads, access to sensitive files, potential data exfiltration
• Errors and crashes: Application failures that may indicate an exploitation attempt
• Malware activity: Virus signatures, C&C communications, typical ransomware behavior

Regulatory compliance

Log analysis and retention are often regulatory requirements (GDPR, PCI-DSS, HIPAA, etc.). We help you put compliant processes in place, including appropriate log retention, protection against tampering and availability for audits.