Cyber Network Defense Analyst

Job Type: Full
- Time

Workplace Type: Onsite in Arlington, VA

Clearance: Active TS/SCI and must be able to obtain a DHS Suitability

Must be a U.S. Citizen

Benefits: Medical, dental, and vision coverage, 401k matching, generous PTO, paid holidays, professional training opportunities, and even pet insurance to ensure your furry friends are cared for too.

The DHS's Hunt and Incident Response Team (HIRT) secures the Nation's cyber and communications infrastructure. HIRT provides DHS's front-line response for cyber incidents and proactively hunting for malicious cyber activity. Castalia Systems performs HIRT investigations to develop a preliminary diagnosis of the severity of breaches. Castalia provides HIRT remote and onsite advanced technical assistance, proactive hunting, rapid onsite incident response, and immediate investigation and resolution using host-based, network-based and cloud-based cybersecurity analysis capabilities.

Contract personnel provide front line response for digital forensics/incident response (DFIR) and proactively hunting for malicious cyber activity. Castalia Systems is seeking a Cyber Network Defense Analyst (CNDA) to support this critical customer mission. The Cyber Network Defense Analyst uses information collected from a variety of sources to monitor network activity and analyze it for evidence of suspicious behavior. Monitoring and analysis are performed to identify and report events that occur, or might occur, within the network, to protect information, information systems, and networks from threats.

CNDAs review data collected to analyze cyber events, and the network environment, to find trends, patterns or anomaly correlations that indicate more serious attacks or future threats. The CNDAs will recommend proactive measures to contain the incident. These proactive measures include, but are not limited to, identification of intruder local changes/suspect interactions, isolation, in-depth digital media analysis, consultation with law enforcement or counterintelligence organizations, development of signatures to detect this malicious behavior and development and deployment of eradication tools.

A qualified candidate will perform the following duties and responsibilities, but are not limited to:

The majority of the CNDA's time (75%) will be spent executing the following tasks:

• Characterize and analyze network traffic to identify anomalous activity and potential threats to network resources
• Coordinate with enterprise-wide cyber defense staff to validate network alerts
• Document and elevate incidents (including events' history, status, and potential impact for further action) that may cause ongoing and immediate impact on the environment
• Perform cyber defense trend analysis and reporting
• Perform event correlation using information gathered from a variety of sources within the enterprise to gain situational awareness and determine the effectiveness of an observed attack
• Provide daily summary reports of network events and activity relevant to cyber defense practices
• Receive and analyze network alerts from various sources within the enterprise and determine possible causes of alerts
• Provide timely detection, identification, and alerting of possible attacks/intrusions, anomalous activities, and misuse activities and distinguish these incidents and events from benign activities
• Use cyber defense tools for continual monitoring and analysis of system activity to identify malicious activity
• Analyze identified malicious activity to determine weaknesses exploited, exploitation methods, effects on system and information
• Determine tactics, techniques, and procedures (TTPs) for intrusion sets
• Examine network topologies to understand data flows through the network
• Identify and analyze anomalies in network traffic using metadata
• Conduct research, analysis, and correlation across a wide variety of all source data sets (indications and warnings)
• Validate intrusion detection system (IDS) alerts against network traffic using packet analysis tools
• Identify applications and operating systems of a network device based on network traffic
• Reconstruct a malicious attack or activity based off network traffic
• Identify network mapping and operating system (OS) fingerprinting activities
• Assist in the construction of signatures which can be implemented on cyber defense network tools in response to new or observed threats within the network environment or enclave
• Notify designated managers, cyber incident responders, and cybersecurity service provider team members of suspected cyber incidents and articulate the event's history, status, and potential impact for further action in accordance with the organization's cyber incident response plan

Approximately 25% of the CNDA's time will be spent executing the following tasks:

• Prepare and update manuals, instructions, and operating procedures
• Evaluate established methods and procedures and prepare recommendations for changes in methods and practices where…