This is the seventh post in our series: Discover Korea’s Tech, where we will talk to a mix of Korean startup entrepreneurs who stood their own ground with their technology, in Korea’s economy notoriously dominated by gigantic companies. Stay tuned over the coming month as we talk to Korean entrepreneurs. You can follow our updates @technodechina for new stories in the series. 

Cyber security is an increasingly important issue. Large companies have played victim to some very public attacks; Sony Pictures Entertainment was the victim of a cyber attack in November 2014 that revealed personal information of its employees. Target also discovered malware on its point-of-sale systems in December 2013.

According to a Raicati Email Statistics Report released in 2015, 77 percent of all malware are installed via email. 39% of total malware installations were from attached files in the email with 34% coming from embedded links in the email.

“Many Mac users think they are safe, but they are also vulnerable to cyber attacks. Same goes for Gmail users. If you leave it on default, it detects the malware, but if you change encoding, it is vulnerable to malware attacks,” CEO of SecuLetter, Chasung Lim told TechNode.

SecuLetter protects the email server from advanced attacks and cloud services to protect email server, using Hybrid Analysis method to detect and block cyber attacks.

“If an antivirus software detected a cyber attack, it means that the attack is already well-known. New kinds of attack such as spear phishing, ransomware, and other targeted attacks can get through existing security solutions and penetrate a company’s security layer,” Mr. Lim says.

SecuLetter’s SLE detection automatizes reverse engineering. When a user receives an email, the company will open the email in the operating system and analyze attached files on the assembly level. After quarantining and blocking malware emails, it sends safe emails to the email server.

SecuLetter’s first trial provides cloud services and charges the usage on a monthly basis to reduce the cost burden.

“Other APT attack solutions cost more. You need to purchase all the equipment first, which requires high upfront investment,” Mr. Lim added. The main competitor in APT attack solution market is FireEye, a publicly listed cyber security company.

“Korea’s biggest retailer company conducted BMT (Benchmarking Test) comparing FireEye’s solution and SecuLetter’s. According to their test, SecuLetter detected malware with a higher percentage than FireEye,” Mr. Lim stated. “Our solution has a higher detection accuracy than sandbox-based APT attack solution because we have proprietary technology, specializing in Non-PE email content.”

The company raised 2 billion KRW ($1.7 million USD) last month, led by Korea Investment Partners and UTC Investment. SecuLetter is supported by K-ICT Born2Global Center, a major Korean government agency under the Ministry of Science, ICT and Future Planning (MSIP).

Image Credit: SecuLetter

Eva Yoo is Shanghai-based tech writer. Reach her at