<Yunolay />

$ cat profile.md

About

Yunolay’s avatar

Yunolay

VTuber / security

I’m Yunolay, based in Japan. I work in security and also stream on YouTube as a VTuber. This site is where I log what I’ve been up to and the things I make.

Career

  1. Moved to Fore-Z as Executive Officer

    Transferred from Executive Officer at Fore-co.ltd to Executive Officer at Fore-Z.

  2. Started writing on note

    Published my first article — a self-introduction — on May 17, 2026, and have been posting on note since.

  3. Executive Officer, Fore-co.ltd

    Executive management and security strategy.

  4. Joined the Synack Red Team (SRT)

    Vulnerability research and red teaming.

    View details

  5. Security Engineer, Poruto-inc

    Vulnerability assessment and penetration testing.

  6. Started freelancing

    Independent security consulting and research.

  7. Left GMO Cybersecurity by Ierae

    About two years and nine months of web/API assessments and mobile game anti-cheat analysis.

  8. Joined GMO Cybersecurity by Ierae

    Assessed PHP, REST API, GraphQL, gRPC and Cloud Firestore targets.

  9. Left LAC Co., Ltd.

    Operated IPS, IDS, WAF and sandboxes in the SOC (FireEye, Palo Alto, Cisco, Juniper).

  10. Joined LAC Co., Ltd. (SOC)

    Started my career in a security operations center.

Certifications

OffSec

OSEE certificate
OSEEOffSec Exploitation Expert
2026.06.02
Details
OSCE3 certificate
OSCE3OffSec Certified Expert 3
2023.11.29
Details
OSED certificate
OSEDOffSec Exploit Developer
2023.11.26
Details
OSEP certificate
OSEPOffSec Experienced Penetration Tester
2023.08.13
Details
OSWE certificate
OSWEOffSec Web Expert
2022.07.02
Details
OSCP certificate
OSCPOffSec Certified Professional
2020.12.09
Details

Hack The Box

HTB CWEE certificate
HTB CWEECertified Web Exploitation Expert
2025.04.05
Details
HTB CPTS certificate
HTB CPTSCertified Penetration Testing Specialist
2024.08.28
Details
HTB CWES certificate
HTB CWESCertified Web Exploitation Specialist
2023.12.15
Details

INE Security

eWPTXv2 certificate
eWPTXv2Web Application Penetration Tester eXtreme
2021.02.03
Details
eCPPTv2 certificate
eCPPTv2Certified Professional Penetration Tester
2021.01.29
Details

Skills

Programming

  • Python
  • JavaScript
  • HTML/CSS
  • Shell Script
  • PowerShell
  • Batch
  • Rust (studying)
  • Go (studying)

Focus areas

  • Web / API
  • Binary Exploitation
  • Windows Internals
  • Active Directory
  • Mobile Game Anti-Cheat
  • Red Team

OS & tools

  • Windows
  • Kali Linux
  • Debian / Ubuntu
  • Burp Suite
  • IDA Pro
  • WinDbg
  • Android rooting
  • iOS jailbreak

Site operator

Site
yunolay.com
Operator
Atsuki Hakozaki (Yunolay)
Location
Tokyo, Japan
Content
Activity log, works, and links to the blog (blog.yunolay.com)
Contact
Contact page

I aim to keep everything accurate, but cannot accept liability for any damage arising from use of this site. See the privacy policy & disclaimer.