ASEC Blog publishes Ransom & Dark Web Issues Week 1, November 2026           FBI Seizes Domain of Bulletproof Hosting Service Virtualine Internal Data of a Saudi ERP and IT Solutions Company Offered for Sale Cyberattacks on Supermarket Refrigeration Systems Spread Across 12 European Countries OBSOFT Claims Data Extortion and Data Destruction […]

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 […]

Overview CVE-2026-111497, disclosed in October 2026, is an out-of-bounds write vulnerability in the Brotli decoder included in Node.js. Brotli is a compression algorithm developed by Google, primarily used to compress web transmission data or to decompress transmitted compressed data. When a web application receives data compressed with Brotli, the Brotli decoder decompresses it. However, if […]

Security Blind Spots Identified by AI The large-scale data breaches disclosed in quick succession in South Korea and Japan in October 2026 mostly originated not from internal core systems, but from peripheral entry points such as externally exposed web services, app backend APIs, and outsourced SaaS (services provided by third-party vendors via the cloud, such […]

ASEC Blog를 통해 한 주간의 ‘Ransom & Dark Web Issues’ – 2026년 10월 5주차를 게시한다.           n0n Data Extortion Attack on a South Korean IT Services and Systems Integration Company Access to a South Korean Steel Pipe Manufacturer’s Production System Reported The Gentlemen Ransomware Attack on Vietnam’s National Airline

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 […]

After an article titled “Two Critical PHP Vulnerabilities Discovered… Urgent Updates Needed Due to Risk of Web Server Attacks” was posted on the AhnLab website yesterday (October 21), we received many inquiries asking for the basis of the figure “approximately 110,000 Korean PHP server IP addresses” cited in the article. This article explains how that […]

Overview Immediately after the PHP vulnerabilities CVE-2026-109618 and CVE-2026-109619 were disclosed on October 21, 2026, a large number of repositories named “php2shell” were created in a short period of time on GitHub, a code repository platform. Of the top 100 repositories (excluding forks) found by searching for “php2shell,” 99 addressed these vulnerabilities, and nearly all […]

On October 22, 2026, the PHP Security Team announced in an advisory that it would release security updates addressing the vulnerabilities CVE-2026-109618 and CVE-2026-109619. Although the causes of the two vulnerabilities differ, they are both remote code execution vulnerabilities that allow an unauthenticated threat actor to execute arbitrary code remotely. AhnLab SEcurity intelligence Center (ASEC) […]

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, […]

ASEC Blog publishes Ransom & Dark Web Issues Week 4, October 2026           The Seven Deadly Sins Claims Data Leaks from Seven Organizations Worldwide HYFLOCK Ransomware Attack on a Saudi ERP Software Company Qilin Ransomware Attack on a Japanese Investment Management Company

It is already well known that illegal software and cracked programs can be exploited for malware distribution. Recently, AhnLab identified a new type of information theft malware (Infostealer) disguised as an illegal program. This malware was first detected in mid-August and, after altering its execution method, began spreading widely in September. Notably, it not only […]

You should also be wary of emails urging you to check the status of your retirement pension fund—a topic that might interest office workers. Recently, phishing emails have been identified that use retirement pension notifications as a pretext to steal email account information. Under the pretext of verifying a secure email, threat actors trick recipients […]

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 […]

Overview AI is being used for various tasks that were previously performed manually, such as research, document writing, and code analysis. A 2026 corporate survey also showed that the scope of AI adoption among organizations had expanded compared to the previous year. Recently, there has been a trend toward automating a significant portion of work […]

ASEC Blog publishes Ransom & Dark Web Issues Week 3, October 2026           n0n Ransomware Attacks on 12 South Korean Port and Logistics Companies Cyberattack Targets Refrigeration Systems at Major French Supermarket Chains Payment and Transaction Data Leak Claimed at a Saudi Fintech Company