Content AhnLab monitored APT (Advanced Persistent Threat) attacks targeting entities in Korea using its own infrastructure. This report summarizes the classification, statistics, and functional characteristics for each type of domestic APT attacks identified during the month of September 2026. Purpose and Scope The report outlines the distribution methods and execution types of APT attacks identified […]

Content This Infostealer Trend Report summarizes the distribution channels, number of malware samples, number of detections, and information on companies targeted by new Infostealers (malware designed to steal information) collected during the month of September 2026. The data was compiled based on detection logs from AhnLab SEcurity intelligence Center (ASEC) and AhnLab products, and includes […]

While tracking infrastructure related to ValleyRAT, numerous suspicious websites were identified that impersonated companies and brands from Korea such as Doosan Robotics and Cheonjeong. The identified sites used the actual companies’ logos, promotional videos, and descriptions to disguise themselves as official websites. The websites offered features such as invitation-code-based registration, login, fee history inquiries, VIP […]

Statistics on Malware Distributed to the Financial Sector In Attack Stage 1, phishing (attacks that trick users into revealing information) had the highest rate at 2.1, Up from 1.8 The previous month. In Attack Stage 2, “Dropper/Downloader” (a type that downloads additional malware) was the most common at 1.1, Though this was a decrease from […]

Purpose and Scope This report summarizes the quantity of new ransomware samples collected, the number of compromised systems, and statistics on targeted businesses during the month of September 2026, as well as major Korean & global ransomware issues. The analysis is based on data collected through ATIP (AhnLab Threat Intelligence Platform) and AhnLab Smart Defense, […]

Purpose and Scope APT cases disclosed in September 2026 demonstrate that attacks have evolved to exploit the developer ecosystem, cloud services, and network management infrastructure as trust layers. Legitimate software installers, GitHub repositories, Microsoft 365, OneDrive, Telegram, Nostr, routers, and authentication servers were all included in the attack chain. Key Trends Supply chain attacks have […]

Overview. This report summarizes cases in which Suo5 (an HTTP/HTTPS-based tunneling tool) was exploited for pivoting—a technique used to expand the scope of an attack to other systems or networks by passing through a system that has already been compromised—by using compromised web servers as relay points to access internal networks for lateral movement. It […]

Key Summary Since the original ARTEX GitHub repository disappeared, there has been an increase in independent distributions and customized instances based on the existing ARTEX codebase. These distributions are being redistributed with the product name, UI, filesystem structure, agent settings, and language modified, while retaining traces of ARTEX. Key Observations In several instances, ARTEX was […]

Contents The AhnLab SEcurity intelligence Center (ASEC) collected attack logs targeting poorly managed Linux SSH servers through honeypots. This report compiles statistics by categorizing the attack sources identified in the third quarter of 2026, the attacks carried out from those sources, and the malware used. The report also provides a classification of the malware used […]

Content The AhnLab SEcurity intelligence Center (ASEC) observed and classified attacks targeting MS-SQL servers and MySQL servers installed on Windows operating systems via the ASD infrastructure. This report summarizes the damage status, attack status, and the types of malware used in the attacks, based on logs identified in the third quarter of 2026. Purpose and […]

Content The AhnLab SEcurity intelligence Center (ASEC) analyzed the attack status of Windows web servers in the third quarter of 2026 based on AhnLab Smart Defense (ASD) logs. The targets were Internet Information Services (IIS) web servers and Apache Tomcat web servers running in Windows environments, with attacks primarily exploiting unpatched vulnerabilities, misconfigurations, and inadequate […]

Note The September 2026 Dark Web Breach Incident Trend Report focuses on data breach cases and the sale of initial access credentials posted on the deep web and dark web forums. The report explicitly states that the accuracy of some of its content cannot be fully verified due to the nature of the sources. Major […]

Note The September 2026 Dark Web Issue Trend Report summarizes major issues that occurred on the deep web and dark web. However, the report notes that due to the nature of the sources, it may be difficult to fully verify the accuracy of some information. Major Issues The official launch of a new dark web […]

Note The September 2026 Dark Web Threat Actor Trend Report focuses on threat actors active on the deep web and dark web, as well as publicly reported cyberattack incidents. It is noted that the factual accuracy of some content cannot be independently verified. Major Issues Some hacktivist groups claimed responsibility for DDoS attacks targeting the […]

Summary of Vulnerability Trends for the Third Quarter of 2026 A total of 36,971 CVEs were disclosed in the third quarter of 2026, representing an increase of approximately 78.6% Compared to the second quarter. Among the vulnerabilities for which CVSS assessments were completed, approximately 12.7% Were rated “Critical” and approximately 42.6% Were rated “High,” meaning […]

Overview In the third quarter of 2026, there was a notable increase in cases where attackers attempted to establish persistence and expand their attacks using paths trusted by the organization following their initial access. Attacks on perimeter devices such as NetScaler and Cisco FMC led to the installation of web shells (server-side scripts for remote […]

Overview AhnLab monitored APT (Advanced Persistent Threat) attacks targeting entities in Korea using its own infrastructure. This report summarizes the types and statistics on domestic APT attacks identified during the month of August 2026. Trends of APT Attacks in South Korea Most of the APT attacks detected in South Korea were distributed via spear phishing […]

The threat actor used SEO poisoning (a technique that exploits search results to redirect users to fake sites) to distribute a malicious installer disguised as a KakaoTalk installer. The appearance and packaging method of the installer changed continuously, and the threat actor sequentially used NSIS, Advanced Installer, and Inno Setup. It contained both legitimate installation […]

Purpose and Scope This report summarizes statistics on new ransomware samples, affected systems, and statistics on targeted businesses collected during the month of August 2026, as well as major Korean & Global ransomware issues. Statistics on targeted businesses were compiled based on the time when publicly available information from ransomware groups’ DLS (Dedicated Leak Sites, […]

Statistics on Malware Distributed to the Financial Sector Malware Distribution Trends. In Attack Stage 1, phishing was the highest at 2.1, Up from 1.8 The previous month. In Attack Stage 2, dropper/downloader was the highest at 1.1, Down from 3.2 The previous month. In Stage 3 of the attack, Infostealers were the most prevalent at […]