INSPECTING ARCHIVED INTELLIGENCE (OUTDATED VERSION).

Tae Kwang Network Information Confirms Hacking and Data Leaks

| 2026-10-23 09:51 CRITICAL LOW DATA BREACH SUPPLY CHAIN
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Executive Summary
AI-generated
A cyber attack on South Korean network and information security firm Taegwang Network Information occurred in October 2026, resulting in a confirmed personal data leak. The international ransomware organization Everest claims to have stolen approximately Two Hundred Sixty-Three Gigabytes of internal data, which includes the names of various organizations, financial companies, public institutions, educational institutions, and information and security companies. The attack is believed to be an unauthorized access to Taegwang Network Information's Microsoft 365 OneDrive account used for business purposes, leading to some data being leaked externally. Everest has disclosed 62 internal items, including customer technical information, which were categorized into various types of materials on a Dark Web post.
Technical Mitigations AI-generated
• Reset credentials and API keys that may have been exposed, and review access logs for the affected accounts or integrations.
Intelligence Metadata
Actors / Malware / CVEs / Campaigns
Target & Sectors
JP KR
manufacturingmanufacturing healthhealth educationeducation financefinance
Incident Timeline
‎October 17th
Daily Security reported on October 17th that hackers, identified as Everest, seized approximately Two Hundred Sixty-Three Point Seven One Gigabytes and 54,581 items of files from Taekwang Network Information.
organisation Daily Security
Daily Security reported on October 17th that Everest had targeted Taekwang Network Information and had seized approximately Two Hundred Sixty-Three Point Seven One Gigabytes, 54,581 items of files.
general_metric 54,581 items
Daily Security reported on October 17th that Everest had targeted Taekwang Network Information and had seized approximately Two Hundred Sixty-Three Point Seven One Gigabytes, 54,581 items of files.
‎October 21st
Taekwang Network Information acknowledged the leakage of personal information due to an external, abnormal access.
‎2026/10/23
Taekwang Network Information has acknowledged a personal data leak due to unauthorized access to its Microsoft 365 OneDrive account.
organisation Taegwang Network Information
Therefore, the personal data leak of Taegwang Network Information is confirmed, but whether the 263GB entire file claimed by Everest was actually stolen, or if the two incidents were due to the same type of cyber attack, and whether the customer's system was also affected, requires further verification.
data_breach 263 entire file
Therefore, the personal data leak of Taegwang Network Information is confirmed, but whether the 263GB entire file claimed by Everest was actually stolen, or if the two incidents were due to the same type of cyber attack, and whether the customer's system was also affected, requires further verification.
Exclusive Follow-up: Network and Security Firm Tae Kwang Network Information Confirms Hacking and Data Leaks, Claims 263GB Hackers Stole Data, Public and Corporate Supply Chain Security Widespread Concerns.
organisation Data Leaks
Exclusive Follow-up: Network and Security Firm Tae Kwang Network Information Confirms Hacking and Data Leaks, Claims 263GB Hackers Stole Data, Public and Corporate Supply Chain Security Widespread Concerns.
organisation Hackers Stole Data
Exclusive Follow-up: Network and Security Firm Tae Kwang Network Information Confirms Hacking and Data Leaks, Claims 263GB Hackers Stole Data, Public and Corporate Supply Chain Security Widespread Concerns.
infrastructure Microsoft 365
The company stated that the leakage was caused by an unauthorized access to its Microsoft 365 OneDrive account, which was used for business purposes.
organisation Microsoft 365 OneDrive
The company stated that the leakage was caused by an unauthorized access to its Microsoft 365 OneDrive account, which was used for business purposes.
organisation Taekwang Network Information
South Korean network and information security firm Taekwang Network Information (Taekwang Network Information) has officially acknowledged that personal information was leaked due to external hacking.
organisation the Korea Information Security and Privacy Agency
Daily Security reported that it had obtained the information of the posting and immediately notified the Korea Information Security and Privacy Agency (KISA), which then notified Taekwang Network Information of the fact.
organisation KISA
Daily Security reported that it had obtained the information of the posting and immediately notified the Korea Information Security and Privacy Agency (KISA), which then notified Taekwang Network Information of the fact.
organisation O-Central Hospital
In particular, items related to O-Central Hospital, including the Seoul National University Hospital, Busan, Sanggye, Ilsan, and Haeun-dae O Hospital, repeatedly appear, and the names of Korean Development Research Institute (KDI), Seoul Metropolitan Transportation Corporation, Korean Regional Heating and Lighting Corporation, and Korean Highway Corporation Service, etc. public and research inst…
organisation the Seoul National University Hospital
In particular, items related to O-Central Hospital, including the Seoul National University Hospital, Busan, Sanggye, Ilsan, and Haeun-dae O Hospital, repeatedly appear, and the names of Korean Development Research Institute (KDI), Seoul Metropolitan Transportation Corporation, Korean Regional Heating and Lighting Corporation, and Korean Highway Corporation Service, etc. public and research inst…
organisation Ilsan
In particular, items related to O-Central Hospital, including the Seoul National University Hospital, Busan, Sanggye, Ilsan, and Haeun-dae O Hospital, repeatedly appear, and the names of Korean Development Research Institute (KDI), Seoul Metropolitan Transportation Corporation, Korean Regional Heating and Lighting Corporation, and Korean Highway Corporation Service, etc. public and research inst…
organisation Korean Development Research Institute
In particular, items related to O-Central Hospital, including the Seoul National University Hospital, Busan, Sanggye, Ilsan, and Haeun-dae O Hospital, repeatedly appear, and the names of Korean Development Research Institute (KDI), Seoul Metropolitan Transportation Corporation, Korean Regional Heating and Lighting Corporation, and Korean Highway Corporation Service, etc. public and research inst…
organisation KDI
In particular, items related to O-Central Hospital, including the Seoul National University Hospital, Busan, Sanggye, Ilsan, and Haeun-dae O Hospital, repeatedly appear, and the names of Korean Development Research Institute (KDI), Seoul Metropolitan Transportation Corporation, Korean Regional Heating and Lighting Corporation, and Korean Highway Corporation Service, etc. public and research inst…
organisation Seoul Metropolitan Transportation Corporation
In particular, items related to O-Central Hospital, including the Seoul National University Hospital, Busan, Sanggye, Ilsan, and Haeun-dae O Hospital, repeatedly appear, and the names of Korean Development Research Institute (KDI), Seoul Metropolitan Transportation Corporation, Korean Regional Heating and Lighting Corporation, and Korean Highway Corporation Service, etc. public and research inst…
organisation Korean Highway Corporation Service
In particular, items related to O-Central Hospital, including the Seoul National University Hospital, Busan, Sanggye, Ilsan, and Haeun-dae O Hospital, repeatedly appear, and the names of Korean Development Research Institute (KDI), Seoul Metropolitan Transportation Corporation, Korean Regional Heating and Lighting Corporation, and Korean Highway Corporation Service, etc. public and research inst…
organisation KT
The education sector includes international schools and domestic universities, while the information and communication sector includes KT and KT Cloud, Anritsu, Fortinet, Cisco, and Lucid, among others.
organisation Fortinet
The education sector includes international schools and domestic universities, while the information and communication sector includes KT and KT Cloud, Anritsu, Fortinet, Cisco, and Lucid, among others.
organisation IP
Network integration companies can handle sensitive technical information such as network configuration, IP address systems, types of security equipment, firewall policies, and remote access methods during the system setup and maintenance process for customer systems.
victims 75 organizations
Therefore, it should not be assumed that all 75 organizations suffered a hacking incident or that confidential information of the organization was leaked.
Tactical Metrics
Metrics
data_breach
263
Entire File
Therefore, the personal data leak of Taegwang Network Information is confirmed, but whether the 263GB entire file claimed by Everest was actually stolen, or if the two incidents were due to the same type of cyber attack, and whether the customer's system was also affected, requires further verification.
Exclusive Follow-up: Network and Security Firm Tae Kwang Network Information Confirms Hacking and Data Leaks, Claims 263GB Hackers Stole Data, Public and Corporate Supply Chain Security Widespread Concerns.
Metrics
infrastructure
‎Microsoft 365
Affected Product
The company stated that the leakage was caused by an unauthorized access to its Microsoft 365 OneDrive account, which was used for business purposes.
Metrics
victims
75
Organizations
Therefore, it should not be assumed that all 75 organizations suffered a hacking incident or that confidential information of the organization was leaked.
Intelligence Sources
Dailysecu 2026-10-23