ESTsecurity
Category: AI in Cybersecurity
South Korea's leading AI-powered endpoint security company, developer of the ALYac (알약) antivirus and next-gen AI security solutions including LLM security and AI agent-integrated threat detection. ESTsecurity was founded in 2017. The company is led by Jung Sang-won (정상원). Based in Seoul, South Korea. Team size: 101-500. Total funding raised: $12M. Latest round: Pre-IPO. Key investors include HB Investment, NH Hedge Asset Management, Yuamco IBK Financial Group PEF (UAMCO).
- Founded
- 2017
- Headquarters
- Seoul, South Korea
- Team size
- 101-500
- Total funding
- $12M
Value proposition
AI-native endpoint security platform protecting 16M+ users and 13,000+ organizations in Korea with proprietary AI/ML threat detection, dual-engine (Tera + Bitdefender) architecture, and Korea's largest domestic threat intelligence database.
Products and solutions
ALYac (알약) Antivirus, ALYac EDR (Endpoint Detection & Response), ALYac xLLM (LLM Security Solution for data leakage & malicious content detection), ALYac XDR (Extended Detection & Response), ALYac Server Security, ALYac Patch Management (PMS), ALYac ZePP (Zero Trust), Threat Inside (Threat Intelligence), SecureDisk (Data Security), ALYac for Linux/Unix/Mac/OpenOS
Unique value
Korea's #1 AI-powered antivirus with 16M+ users, combining proprietary AI threat detection (AIS engine), 10+ years of endpoint security expertise, and the country's largest domestic threat intelligence network (ESRC) for superior detection of Korean-language and region-specific cyber threats.
Target customer
Individual consumers (16M+ users), government agencies, public institutions, educational institutions, and enterprise businesses in South Korea
Industries served
Government & Public Sector, Education, Enterprise/Corporate, Financial Services, Healthcare
Technology advantage
Proprietary AIS (ALYac Intelligence Scan) AI/ML engine; dual-engine architecture (Tera + Bitdefender); 190M+ malware detected annually; ESRC (ESTsecurity Security Response Center) threat intelligence team with government collaboration; K-AI product strategy incorporating proprietary AI technology; ALYac xLLM for generative AI security; AI agent-integrated security roadmap
How they differentiate
Unlike global competitors, ESTsecurity has the largest domestic user base (16M+) in Korea providing unmatched local threat data; operates ESRC (Security Response Center) in close collaboration with Korean government agencies; offers Korean-specific threat detection that global vendors cannot match; part of the ESTsoft ecosystem with cross-synergies across the group's 16M+ user base
Main competitors
AhnLab (V3), ESET, Gen Digital (NortonLifeLock)
Key partnerships
XSLAB (Arm-based cloud security development, 2026), ESTsoft (parent company ecosystem), Korean government agencies (via ESRC), extensive authorized partner/reseller network across Korea
Notable customers
16M+ individual users, 13,000+ government agencies, public institutions, educational institutions, and enterprise customers in South Korea
Major milestones
2017: Spun off from ESTsoft as independent cybersecurity subsidiary (est. 2017-01-03), 2022-03: Appointed Jung Jin-il as external CEO (IPO mandate), 2022-05: Raised KRW 15B (~$12M) Pre-IPO from HB Investment, NH Hedge Asset Management, UAMCO IBK PEF; selected KB Securities as IPO underwriter, 2024–2025: ALYac xLLM (LLM security) introduced/promoted for gen-AI data leakage & malicious content control, 2026-early: Jung Jin-il resigned; Jung Sang-won (ESTsoft CEO) reappointed as ESTsecurity CEO (dual role), 2026-01: MOU with XSLAB (엑세스랩) for Arm-based cloud security R&D, 2026-02: Partner Kick-Off 2026 (Security × AI strategy), 2026-07: 2026 Enterprise Partner Networking Day (AI-driven security strategy)
Growth metrics
16M+ users; 13,000+ organizational customers; 147 employees (May 2026); 190M+ malware detected annually
Market positioning
Top 2 cybersecurity company in South Korea alongside AhnLab; dominant in consumer antivirus with ALYac (알약) as the "national antivirus"; expanding into enterprise EDR/XDR, zero trust, and AI security (LLM security) markets
Geographic focus
South Korea (primary); expanding into global markets through partnerships
Patents and IP
27 registered patents (as of 2025); proprietary AIS (ALYac Intelligence Scan) AI engine; Tera anti-malware engine
About Jung Sang-won (정상원)
ESTsoft CEO since 2016 (joined 1999); previously Altools business unit head and Zoom Internet VP; previously ESTsecurity CEO until Mar 2022, returned as ESTsecurity CEO early 2026 (dual role with ESTsoft). Seoul National University Mathematics B.S.; 2019 Industrial Medal (Venture Entrepreneurship Merit); National AI Strategy Committee data subcommittee civilian member (2025~); KOSA Service Innovation Committee chair (2021~).
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Official website: https://www.estsecurity.com