Cyber Network Defense Analyst (CNDA) 3

Arlington, VA

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Advanced IT Consulting Solutions

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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.  ARSIEM has an experienced workforce of qualified professionals committed to providing the best possible support.

As demand increases, ARSIEM continues to provide reliable and cutting-edge technical solutions at the best value to our clients.  That means a career packed with opportunities to grow and the ability to have an impact on every client you work with. 

ARSIEM is looking for a Cyber Network Defense Analyst 3. This position is primarily a hybrid remote position with a 2-hour onsite reporting requirement and business travel as needed. Personnel will be required to live in the Continental US and are required to work core hours (Eastern Standard Time) to support one of our Government clients in Arlington, VA.


  • 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 event's history, status, and potential impact for further action) that may cause ongoing and immediate impact to 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 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 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 
  • Prepare and update manuals, instructions, and operating procedures
  • Evaluate established methods and procedures and prepare recommendations for changes in methods and practices where appropriate
  • Plan and carry out difficult and complex assignments and develop new methods, approaches, and procedures
  • Conduct analyses and recommend resolution of complex issues affecting the specialty area
  • Ensure optimal use of commercially available products
  • Prepare and present reports
  • Evaluate the effectiveness of installed systems and services

Minimum Qualifications

  • BS Computer Science, Cyber Security, Computer Engineering, or related degree; or HS Diploma & 7-9 years of network investigations experience.
  • 5+ years of directly relevant experience in cyber defense analysis using leading-edge technologies and industry-standard cyber defense tools
  • Experience successfully developing and deploying signatures
  • Experience detecting host and network-based intrusions via intrusion detection technologies (e.g., Snort)
  • Experience implementing incident handling methodologies
  • Experience implementing protocol analyzers
  • Experience collecting data from a variety of cyber defense resources
  • Experience reading and interpreting signatures (e.g., snort)
  • Experience performing packet-level analysis
  • Experience conducting trend analysis

Preferred Qualifications

  • GSEC (SANS401), Arcsight (or other SEIM solution), Network+, Security+ and Python programming experience would be ideal.
  • Strong math and science background.
  • Experience with Carnegie Mellon SiLK tool suite.
  • One or more of the following professional certifications: GNFA, GCIH, GCIA, GSEC, CASP+, CySA+, PaLMS, FedVTE
Clearance Requirement: This position requires an Active TS/SCI clearance and the ability to obtain Department of Homeland Security (DHS) Entry on Duty (EOD) Suitability.
Candidate Referral: Do you know someone who would be GREAT at this role? If you do, ARSIEM has a way for you to earn a bonus through our referral program for persons presenting NEW (not in our resume database) candidates who are successfully placed on one of our projects. The bonus for this position is 5,000,  and the referrer is eligible to receive the sum for any applicant we place within 12 months of referral. The bonus is paid after the referred employee reaches 6 months of employment.

ARSIEM is proud to be an Equal Opportunity and Affirmative Action Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability or veteran status, age, or any other federally protected class.

* Salary range is an estimate based on our InfoSec / Cybersecurity Salary Index 💰

Tags: ArcSight CASP+ Clearance Computer Science Cyber defense GCIA GCIH GNFA GSEC IDS Intrusion detection Monitoring Python SIEM Snort TS/SCI TTPs

Perks/benefits: Salary bonus Team events

Region: North America
Country: United States
Job stats:  11  1  0

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