SecuLetter

SecuLetter is a South Korean cybersecurity company founded in 2015, specializing in content security based on Content Disarm and Reconstruction (CDR) technology. The company's core technology is the MARS engine, a reverse-engineering based analysis system that disassembles files at the binary level without executing them, enabling detection of malware embedded in non-executable files such as documents, images, and emails. The company's product line includes File Security (SLF), a file security gateway for cross-domain and network environments; Email Security (SLE and DISARM), which sanitizes email attachments and content; CDR Sanitization (SLCDR), the core disarm-and-reconstruction module; and ConTI, a threat intelligence offering. SecuLetter serves public-sector, financial, and enterprise customers in South Korea, reporting over 100 deployments including government ministries, the National Health Insurance Service, the National Pension Service, and securities firms such as KB Securities and Korea Investment & Securities. The company has received certifications including a 100% malware detection score from the Korea Internet & Security Agency (KISA), TTA GS Grade 1, and Common Criteria certification, and was named a Representative Vendor in the Gartner CDR Market Guide. SecuLetter has been listed on the KOSDAQ stock exchange since 2023 and is headquartered in Seongnam, South Korea. The company employs around 45 people, with more than 20 in research and development, and holds a large portfolio of CDR-related patents in Korea.