In the scenario described, where attackers have penetrated the network and are staging data for exfiltration, Jim should focus on monitoring network traffic for signs of malicious file transfers, implement file integrity monitoring, and scrutinize event logs. This approach is crucial for detecting unusual activity that could indicate data staging, such as large volumes of data being moved to uncommon locations, sudden changes in file integrity, or suspicious entries in event logs. Early detection of these indicators can help in identifying the staging activity before the data is exfiltrated from the network.References:
* NIST Special Publication 800-61 Rev. 2, "Computer Security Incident Handling Guide"
* SANS Institute Reading Room, "Detecting Malicious Activity with DNS and NetFlow"