Active Cyber Defense Analyst

Positive Corp - Greenbelt, MD (30+ days ago)

The ACD Analyst will look through network flow, PCAP, logs, and sensors for evidence of cyber-attack patterns, hunt for Advanced Persistent Threats (APT).


  • Actively hunt for Indicators of Compromise (IOC) and APT Tactics, Techniques, and Procedures (TTP) in network and on host
  • Find evidence of attack, and attackers actions thereafter
  • Work with team to produce effective countermeasures against found evidence. Also, contributes to mitigations for future attacks of a similar nature.
  • Follow Security Operations Center (SOC) policies, procedures for incident reporting and management. Create a detailed Incident Report (IR) and contribute to lessons learned. .
  • Analyze infrastructure build sheets, Configuration Management Database (CMDB), NIST 800-53 ATO artifacts, Vulnerability scans, Access Control Lists (ACL), and vendor documentation to thoroughly understand software behaviors and interactions
  • Monitor open source and commercial threat intelligence for IOCs, new vulnerabilities, software weaknesses, and other attacker TTPs
  • Study and understand IANA, W3C, IETF and other internet bodies’ protocol RFC definitions to understand violations and security weaknesses
  • Conduct forensic testing and operational hardening of multiple OS platforms
  • Analyze network perimeter data, flow, packet filtering, proxy firewalls, and IPS/IDS to create and implement a concrete plan of action to harden the defensive posture
  • Work with SOC shift team to help contain intrusions
  • Provides detailed requirements to team security engineers, SIEM specialists, and other team capability developers to provide reusable hunt tactics and techniques for other team analysts
  • Provide detailed input to watchlog and provide thorough pass-down
  • Generates documentation as required by the US Census

Desired Experience:

  • Thorough understanding of network protocol behaviors. Ability to understand netflow and PCAP
  • Thorough knowledge of open source tools to visualize PCAP data (Wireshark, TCPDump, etc.)
  • Detailed knowledge of various forms of social engineering, including the ability to recognize and handle spear-phishing campaigns or other forms of social engineering attacks
  • Comprehensive knowledge of Windows and Linux behaviors, logging, vulnerabilities, exploits, and known attacks
  • Use of IPSec packet filtering and Windows firewalls with specific application to defense in depth of network based attacks, data corruption, data theft, credential theft, and administrative control
  • Red Team/Blue Team experience from a federal agency

Required Skills:

  • Expert knowledge of network routing and switching fundamentals to include knowledge of Multiprotocol Layer Switching (MPLS)
  • Deep technical understanding of operating systems, network architecture and design, Active Directory (AD) application log consumables, systems design as well as superior knowledge of technical operations process and procedures
  • Knowledge of how encryption, key management and cryptology works in the enterprise and in cyber data
  • Understanding of Enterprise Architecture Standards such as the Department of Defense Architecture Framework (DODAF), Service-Oriented Architecture (SOA), the Open Group Architecture Framework (TOGAF), and/or the Amazon Web Services (AWS) Well Architected Framework
  • Knowledge in the Risk Management Framework (NIST 800-37), Security Controls as described in NIST 800-35, and the Federal Information Security Modernization Act (FISMA) operating standards and applicable guidelines (risk profiling, control selection, control assessment, control monitoring)
  • Expertise in performing threat modelling, risk analysis, root cause analysis, risk identification, and risk mitigation
  • Expertise in Application Penetration Testing (fuzzing, reverse engineering, Fortify or similar, IDA Pro, Kali, BackTrack, OllyDbg, SQLMap, etc.)
  • Expertise in Proof of Concept (Exploit) development
  • Understanding of Secure SDLC (threat modelling, security requirements, secure design, secure implementation, secure testing, secure maintenance)
  • Knowledge of Mobile Application Security and MDM sensor data
  • Expertise in Embedded Device Security
  • Expertise in Malware Analysis
  • Expertise in a variety of web application protocols, web services (components including JavaScript, XML, JSON), scripting capabilities (Powershell, Python, BASH) software development frameworks, operating systems, and networking technologies. Understanding of various web application frameworks such as NET, J2EE
  • Organizational Skills: Proven ability to plan and prioritize work, both their own and that of team. Follows tasks to their logical conclusion
  • Problem Solving: Natural inclination for planning strategy and tactics. Ability to analyze problems and determine root cause, generating alternatives, evaluating and selecting alternatives and implementing solutions
  • Results oriented: Able to drive things forward regardless of personal interest in the task

Education/Experience requirements:

  • High School and:
  • Masters and 12 years, Bachelors and 14 years, or AA and 16 years

Required Certifications: 1 of the following:

  • CERT Certified Computer Security Incident Handler
  • Electronic Commerce Council Certified Ethical Hacker (ECC)
  • GIAC Information Security Fundamentals (GISF)
  • ISC2 Certified Information System Security Professional (CISSP)

Preferred Certifications: OSCP, CSSLP, GIAC (GPEN), GIAC (GWAPT), GIAC (GXPN), GIAC (GMOB), GIAC (GAWN), GIAC (GPYC), etc.



Must have:

  • The ability to pass a criminal background and drug test
  • Reliable transportation
  • A Security Clearance or the ability to obtain one

Job Types: Full-time, Contract


  • High school or equivalent (Required)

Work authorization:

  • United States (Required)