### Summary
The initial access vector for APT23, known as KeyBoy, involves sophisticated phishing emails targeting media and NGO personnel in Vietnam. These emails are crafted to appear as legitimate communications from known contacts or organizations.

### Details
- **Phishing Email Characteristics:**
  - Use of domain spoofing and compromised accounts to increase authenticity.
  - Emails often contain urgent language or contextually relevant topics to the recipient.

- **Attachments and Links:**
  - Malicious Office document attachments with embedded macros.
  - Links to compromised websites hosting malicious payloads.

### Recommendations
- **User Awareness Training:** Emphasize the importance of scrutinizing unexpected emails, even from known contacts.
- **Email Filtering Solutions:** Implement advanced email filtering to detect and block phishing attempts.