Network Systems Analyst III

About ARSIEM Corporation

At ARSIEM Corporation we are committed to fostering a proven and trusted partnership with our government clients. We provide support to multiple agencies across the United States Government and operate with an experienced workforce of qualified professionals committed to providing the best possible support.

As demand increases, ARSIEM continues to deliver reliable and cutting‑edge technical solutions at the best value to our clients, offering a career rich with growth opportunities and the chance to make a meaningful impact on every client we serve.

The Cyber Network Defense Analyst (CNDA) will monitor network activity and identify and report events that occur, or might occur, within the network in order to protect information, information systems, and networks from threats. The CNDA will review collected data to analyze cyber events and the network environment, identifying trends, patterns, or anomaly correlations that indicate more serious attacks or future threats.

The CNDA will recommend proactive measures to contain incidents, including identifying intruders, local changes, suspect interactions, isolation, in‑depth digital media analysis, consultation with law enforcement or counterintelligence organizations, development of signatures to detect malicious behavior, and deployment of eradication tools. This position will support one of our Government clients in Arlington, VA.

• 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 escalate incidents, including the event's history, status, and potential impact for further action
• 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 attacks/intrusions, anomalous activities, and misuse activities, and distinguish these incidents from benign activities
• Utilize cyber defense tools for continuous monitoring and analysis of system activity to detect malicious activity
• Analyze identified malicious activity to determine weaknesses exploited, exploitation methods, effects on the 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 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 on network traffic
• Identify network mapping and operating system (OS) fingerprinting activities
• Assist in the construction of signatures that 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 provide recommendations for changes in methods and practices where appropriate
• Plan and execute challenging and complex assignments, and…