defensive-opsec

Detect credential leaks and subdomain exposure by applying certificate transparency checks via crt.sh, scanning GitHub repos with TruffleHog or GitLeaks, and reviewing Entra ID SigninLogs to identify compromised credentials across cloud services.

Prevent DNS zone transfer vulnerabilities by reviewing DNS AXFR controls and configurations to detect and block unauthorized external reconnaissance, reducing the organization's attack surface exposure.

Certificate transparency monitoring works by querying crt.sh to track issued certificates, detecting newly exposed subdomains from external reconnaissance, and triggering rapid remediation to enforce security policies.

Yes, you can use TruffleHog and GitLeaks for GitHub secret scanning, integrating them with pre-commit hooks and incident response playbooks to remediate compromised credentials in code repositories.

Monitor Entra ID SigninLogs for OPSEC to detect active exploitation of leaked credentials, correlate identity-based anomalies with code repository exposures, and initiate rapid incident response workflows.

Certificate transparency checks only reveal subdomains with issued certificates and may miss non-SSL assets, requiring supplementary DNS configuration reviews and AXFR controls for comprehensive attack surface reduction.