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The Malware tag covers malware families, infrastructure analysis, incident impact, disruption efforts, and defensive guidance to reduce cybersecurity risk.

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Background for this topic.

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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Russian-speaking UAT-11795 spreads trojanized Zoom, Webex, and MobaXterm installers to deliver Starland RAT and the WLDR memory-only implant. Cisco Talos researchers published a detailed technical report on July 16 disclosing UAT-11795, a financially motivated, Russian-speaking threat actor that has been running a malware campaign against users in the United States and Europe since at least […]

Security Affairs 17 Jul 2026, 9:08 p.m. Incident · 2 stories America Cisco Europe Malware Remote Access Trojan Report Research Russia Threat Actor

AsyncAPI npm packages with 2M weekly downloads were compromised, spreading malware with info-stealing, crypto-theft and RAT capabilities. OX Security researchers disclosed on July 14 that the AsyncAPI npm organization was compromised, with malicious code injected into four packages that together account for over 2 million weekly downloads. The affected versions are @asyncapi/generator 3.3.1, @asyncapi/generator-components 0.7.1, […]

Security Affairs 15 Jul 2026, 11:55 p.m. Incident · 3 stories Compromise Cryptocurrency Disclosure Malicious Code Malware Node.js Remote Access Trojan Research Supply Chain Theft

Huntress found an AI-generated PowerShell script used for AD reconnaissance, showing attackers are using AI to create custom, evasive tools. During an incident response investigation on June 3, 2026, Huntress analyst Jevon Ang recovered a PowerShell script from a compromised Windows Server that the attacker had used to map out the victim’s Active Directory environment. […]

Security Affairs 14 Jul 2026, 10:21 p.m. Incident · 3 stories Active Directory Artificial Intelligence Compromise Incident Investigation Malware Microsoft PowerShell Victims

Japan’s largest taxi operator Nihon Kotsu shut down systems after a malware attack, disrupting dispatch and bookings. Nihon Kotsu, Japan’s largest taxi company, disclosed on July 13, 2026 that its internal systems suffered an unauthorized external access involving malware infection in the early morning hours of Saturday, July 11. The company immediately shut down systems […]

Security Affairs 14 Jul 2026, 9:05 p.m. Incident · 4 stories Disclosure Infection Japan Malware Shut Down

New macOS infostealer CrashStealer uses a signed app to bypass Gatekeeper, steals credentials and wallets, then AES-encrypts stolen data. Jamf Threat Labs first spotted CrashStealer in early May 2026 as a suspicious macOS sample uploaded to VirusTotal. By early July, in-the-wild detections confirmed the malware had moved from development into active deployment. The malware is […]

Security Affairs 14 Jul 2026, 7:42 p.m. Incident · 5 stories Bypass Credentials Evasion macOS Malware Theft
Security Affairs 5 days, 22 hours ago

SECURITY AFFAIRS MALWARE NEWSLETTER ROUND 105

Security Affairs Malware newsletter includes a collection of the best articles and research on malware in the international landscape Malware Newsletter Novel Java-Based QuimaRAT Targets Windows, macOS, and Linux   Vibe Coded Extortion: Avalon’s Path from Legal Lure to CrownX Ransom Capabilities Armored Likho digging a snake pit: inside the covert BusySnake Stealer campaign   RedWing: A […]

Security Affairs 13 Jul 2026, 1:57 a.m. Theme · 8 stories Extortion Java Linux macOS Malware Microsoft Ransom Research