Arsiem
Arlington, MA
Full-Time
6 days ago

Arsiem VERIFIED EMPLOYER

Network Based Systems Analyst II.

Cybersecurity & Info Security Full-Time

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Network Based Systems Analyst II: our view in 3 lines...

The Role:This role is for a cyber network defense analyst who monitors network traffic for suspicious activity and supports the investigation of security incidents.
The Person:The person will assist with preliminary incident response investigations, collect network intrusion artifacts, analyze malicious network activity, and help write reports on incident findings.
Requirements:The ideal candidate has in depth knowledge of TCP/IP protocols, substantial knowledge of Splunk or other SIEMs, an understanding of MITRE ATT&CK, and a degree in Computer Science or Cyber Security.

About the role

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 Network Forensics Cybersecurity Analysts to assist the Government lead in coordinating teams in preliminary incident response investigations. This position will support one of our Government clients in Arlington, VA.

Responsibilities

Assists the Government lead in coordinating teams in preliminary incident response investigations

Assists the Government lead with interfacing with the customer while on site

Determines appropriate courses of actions in response to identified and analyses anomalous network activity

Assesses network topology and device configurations identifying critical security concerns and providing security best practice recommendations

Assists with the writing and publishing of Computer Network Defense guidance and reports on incident findings to appropriate constituencies

Collects network intrusion artifacts (e.g., PCAP, domains, URI’s, certificates, etc.) and uses discovered data to enable mitigation of potential Computer Network Defense incidents

Analyzes identified malicious network activity to determine weaknesses exploited, exploitation methods, effects on system and information

Collects network device integrity data and analyze for signs of tampering or compromise

Assists with real-time CND incident handling (i.e., forensic collections, intrusion correlation and tracking, threat analysis, and advising on system remediation) tasks to support onsite engagements

Minimum Qualifications

BS Computer Science, Cyber Security, Computer Engineering, or related degree; or HS Diploma & 4-6 years of network investigations experience.

2+ years of directly relevant experience in network investigations

In depth knowledge of CND policies, procedures and regulations

In depth knowledge of TCP/IP protocols

In depth knowledge of standard protocols – ICMP, HTTP/S, DNS, SSH, SMTP, SMB, NFS, etc.

In depth knowledge and experience of Wifi networking

In depth knowledge and experience of network topologies DMZs, WANs, etc.

Substantial knowledge of Splunk (or other SIEMs)

Understanding of MITRE Adversary Tactics, Techniques and Common Knowledge (ATT&CK)

Knowledge of Computer Network Defense policies, procedures, and regulations

Knowledge of defense-in-depth principles and general attack stages with respect to network security architecture

Ability to characterize and analyze network traffic to identify anomalous activity and potential threats to network resources

Ability to identify and analyze anomalies in network traffic using metadata

Experience with reconstructing a malicious attack or activity based on network traffic

Experience examining network topologies to understand data flows through the network

Must be able to work collaboratively across physical locations

Preferred Qualifications

Substantial knowledge of network device integrity concepts and methodologies

Proficiency with network analysis software (e.g. Wireshark)

Proficiency with carving and extracting information from PCAP data

Proficiency with non-traditional network traffic (e.g. Command and Control)

Proficiency with preserving evidence integrity according to standard operating procedures or national standards

Proficiency with designing cyber security systems and environments in a Linux and/or

Windows environment

Proficiency with virtualized environments

DoD 8140.01 IAT Level II, IASAE II, CSSP Analyst

DoD 8140.01 GCIA, GCIH, CSSP Analyst/CSSP Incident Responder

DoD 8140.01 CEH, CSSP Analyst

SANS GIAC GNFA preferred

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 $3,500, 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.

Published November 6, 2026

Location Arlington, MA

Category Cybersecurity & Info Security

Job Type Full-Time

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