### Initial Findings

The phishing email detected contained a malicious attachment disguised as an invoice. The email was sent from a seemingly legitimate domain but upon further inspection, the domain was registered only days prior to the attack. The email header analysis revealed multiple red flags including mismatched sender information and a peculiar routing path through compromised servers.

### Next Steps

1. **Immediate Action:** Isolate the user account that received and interacted with the email.
2. **Investigation:** Conduct a deeper analysis of the attachment to determine the specific exploit used.
3. **Preparation:** Anticipate potential execution attempts via scripts and monitor PowerShell activity closely.