### Contextual Analysis

Following the detection of the **trojanized software update**, our investigation reveals that the compromise occurred through a sophisticated supply chain attack. The malicious update originates from a compromised vendor responsible for developing ICS software used widely in the energy sector.

### Key Observations:
- **Vendor Breach**: Initial analysis suggests that the vendor's software distribution infrastructure was breached approximately 3 months ago.
- **Malware Characteristics**: The trojanized update includes a payload designed to install a Remote Access Trojan (RAT) known as 'Havex'.

### Next Steps:
- **Monitor for RAT Deployment**: Be vigilant for signs of 'Havex' RAT installation and execution across affected systems.
- **Vendor Communication**: Engage with the software vendor to confirm breach details and remediation plans.