The Malware tag covers malware families, infrastructure analysis, incident impact, disruption efforts, and defensive guidance to reduce cybersecurity risk.
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Malware is software intentionally created or modified to perform unauthorized or harmful actions on a computer, device, or network. The term covers distinct families and functions, including viruses, worms, trojans, spyware, botnet clients, and ransomware; a single sample may combine several capabilities. Its behavior—not its label—determines the security concern: it may execute code, persist, alter or encrypt data, steal credentials, or provide unauthorized remote access.
For practitioners, malware reporting is most useful when it identifies the family or tool conservatively and provides evidence such as affected platforms, samples, infrastructure, or observed behavior. Defenses include promptly patching vulnerable software, restricting execution and privileges, monitoring endpoints and networks, maintaining tested backups, and isolating suspected systems for analysis. Detection should use behavior and verified indicators rather than names alone, since variants change. If malware processes personal or regulated data, investigations should also address privacy, evidence preservation, and applicable reporting obligations.
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In this blog entry, TrendAI™ Research examines a wave of phishing emails observed in May 2026 that targeted Japanese accommodation facilities using Booking.com, detailing the victims, attack techniques used, and characteristics of the malware involved.
Cybercriminals hijacked Google Ads searches for popular AI developer tools to funnel over 2,000 victims toward malicious download pages before quietly moving their operation onto claude.ai's own platform, turning the trusted domain into a delivery mechanism for credential-stealing malware.
Void Dokkaebi, a North Korea-aligned intrusion set, has updated its information-stealing malware, InvisibleFerret, shifting its delivery format to evade script-based detections.
In this blog entry, researchers from the TrendAI™ MDR team discuss how they mapped the full end-to-end operation of SHADOW-WATER-063’s Banana RAT banking malware by analyzing server-side artifacts and victim-side data.
Targeting multiple industries worldwide, the InstallFix campaign uses fake Claude AI installer pages to trick users into running malware that collects system information, disables security features, achieves persistence, and connects to attacker-controlled C&C servers for additional payloads.
TrendAI™ Research breaks down Quasar Linux (QLNX), a previously undocumented sophisticated Linux RAT with low detection rates. In this blog, we examine a full-featured Linux threat incorporating a rootkit, a PAM backdoor, credential harvesting, and more, revealing how this malware enables stealthy access, persistence, and potential supply-chain attacks.
Our research on Void Dokkaebi’s operations uncovered a campaign that turns infected developer repositories into malware delivery channels. By spreading through trusted workflows, organizational codebases, and open-source projects, the threat can scale from a single compromise to a broader supply chain risk.
Not every cloud breach starts with malware or a zero-day. In this incident, attackers discovered an exposed Spring Boot Actuator endpoint, harvested credentials from leaked configuration data, then used the OAuth2 Resource Owner Password Credentials (ROPC) flow to authenticate without MFA.
Our analysis of an active KongTuke campaign deploying modeloRAT — malware capable of reconnaissance, command execution, and persistent access — through compromised WordPress sites and fake CAPTCHA lures shows that the group still operates this delivery chain in parallel with the newer CrashFix technique.
The BoryptGrab campaign uses fake SEO‑optimized GitHub repositories and deceptive download pages to distribute a data‑stealing malware family that delivers multiple payloads, including a reverse SSH backdoor, to Windows users.
TrendAI™ Research provides a technical analysis of a compromised EmEditor installer used to deliver multistage malware that performs a range of malicious actions.
In this blog entry, Trend™ Research provides a comprehensive breakdown of GhostPenguin, a previously undocumented Linux backdoor with low detection rates that was discovered through AI-powered threat hunting and in-depth malware analysis.
Through AI-driven code conversion and a layered infection chain involving different file formats and scripting languages, the threat actors behind Water Saci are quickly upgrading their malware delivery and propagation methods across WhatsApp in Brazil.
Continuous investigation on the Water Saci campaign reveals innovative email-based C&C system, multi-vector persistence, and real-time command capabilities that allow attackers to orchestrate coordinated botnet operations, gather detailed campaign intelligence, and dynamically control malware activity across multiple infected machines.
Trend™ Research has identified an active campaign spreading via WhatsApp through a ZIP file attachment. When executed, the malware establishes persistence and hijacks the compromised WhatsApp account to send copies of itself to the victim’s contacts.
Combining AI-generated code and social engineering, EvilAI operators are executing a rapidly expanding campaign, disguising their malware as legitimate applications to bypass security, steal credentials, and persistently compromise organizations worldwide.
Trend™ Research analyzed a campaign distributing Atomic macOS Stealer (AMOS), a malware family targeting macOS users. Attackers disguise the malware as “cracked” versions of legitimate apps, luring users into installation.
The TAOTH campaign exploited abandoned software and spear-phishing to deploy multiple malware families, targeting dissidents and other high-value individuals across Eastern Asia.
Crypto24 is a ransomware group that stealthily blends legitimate tools with custom malware, using advanced evasion techniques to bypass security and EDR technologies.
Lumma Stealer has re-emerged shortly after its takedown. This time, the cybergroup behind this malware appears to be intent on employing more covert tactics while steadily expanding its reach. This article shares the latest methods used to propagate this threat.