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About Me

About Jaewook Jung

I'm Jaewook Jung, a career changer from finance to blue team cybersecurity, based in Melbourne.

Background

Four years across the Global Equity / Global Stock desks at three Korean securities firms: Hanwha, IBK, KB. The role ran the operational layer between front-office trading and the technical systems behind it: FIX-based order routing through Bloomberg EMSX, Bloomberg Terminal for market data and comms, and the in-house DBMS our IT team maintained.

I owned the system connections between our firm and overseas brokers and exchanges (primarily NYSE and NASDAQ), the FIX-protocol rails that carry cross-border trades in real time. When that connectivity broke, the impact was measured in minutes of trading downtime, so I was first-line on response: identify root cause from the message flow, brief internal IT, and drive resolution across vendors and affected clients until service was restored.

That triage-and-coordinate loop is essentially Tier 1 SOC work, just with trading systems instead of security alerts. Reading FIX message logs to trace a failed order isn't far from reading proxy logs to trace a failed authentication. The pivot to cybersecurity wasn't a clean break; it was the part I'd already been doing. SOC Analyst is the target role.

  • Hanwha Investment & Securities | Global Equity Team (Jul 2023 – Nov 2025)
    • Owned cross-border system connectivity with US brokers and exchanges
    • First responder for connectivity incidents: root cause analysis, escalation, multi-party resolution
    • Led web development planning and US broker onboarding contracts
  • IBK Securities | Global Stock Department (Dec 2021 – Jul 2023)
    • Same operational ownership of overseas broker / exchange connectivity and incident response
    • Partnered with IT to design internal DBMS management screens
    • Onboarded international brokers into the firm's financial service frameworks
  • KB Securities | Data Analysis Intern (Aug 2021 – Sep 2021)
    • Customer data analysis with Tableau dashboards

What I'm focused on

  • Target role: SOC Analyst (blue team track)
  • Master of Cybersecurity at RMIT (Mar 2026 – present)
  • B.S. Statistics & Computer Science at Korea National Open University (expected Feb 2026)
  • Lab platforms: CCD, BTL1, BTLO, TryHackMe, CyberDefenders

Certifications

  • CCD (Certified CyberDefender): Golden Badge, score 90
  • BTL1 (Blue Team Level 1)
  • CompTIA Security+

Tools I use in labs and study

  • SIEM: Splunk, Elastic
  • Forensics: Autopsy, Volatility, Wireshark
  • Threat Intel: MISP, OpenCTI
  • Frameworks: MITRE ATT&CK, Cyber Kill Chain, Diamond Model
  • Data: SQL, Tableau, Python

Why this blog exists

  • Learning log first: writing a walkthrough is what tells me whether I actually understood the lab
  • Portfolio second: I'd rather a hiring manager read 30 lab writeups than scan a one-page resume

If a post is here, I did the work myself.

Get in touch