### Overview
After detecting suspicious network activity, further investigation into the entry point revealed the use of a sophisticated phishing attack. The attackers crafted emails mimicking trusted internal communications, which included links to malicious sites hosting exploit kits.

### Key Findings
- **Phishing Techniques**: The attackers utilized spear-phishing emails targeting key personnel.
- **Exploit Kits**: Analysis indicates use of a known exploit kit, leveraging a zero-day vulnerability in an outdated software version.

### Recommendations
- **Immediate Actions**: Isolate affected systems to prevent further exploitation.
- **Patch Management**: Ensure all systems are updated to mitigate known vulnerabilities.