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Case Studies

Case Study: SIEM Modernisation for a Tier-1 Indian Bank

How OSA replatformed a legacy SIEM to a cloud-native detection stack, cutting MTTD by 71% and false positives by 63% while achieving RBI CSITE readiness.

OSA Cyber Advisory· Virtual CISO Practice 11 min read

Case Study: SIEM Modernisation

Client

Tier-1 Indian scheduled commercial bank, 5,000+ branches.

Challenge

Legacy SIEM producing 8,000 alerts/day, 12-hour MTTD, RBI CSITE audit findings.

Solution

  • Cloud-native SIEM with UEBA
  • 240 detection use cases mapped to MITRE ATT&CK
  • 24×7 co-managed SOC integration
  • Automated CSITE reporting

Outcome

  • MTTD reduced 71% (12h → 3.5h)
  • False positives reduced 63%
  • Zero RBI observations at next audit
siem banking soc