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.
The latest banking Trojan campaign to hit Brazil combines classic malware with a real-time human operator, waiting for the perfect moment to strike.
After several years of using simple implants, the Russia-affiliated actor is back with two new sophisticated malware tools.
A campaign by Russian-speaking cyberattackers hijacks workflows to deliver security-busting malware, allowing attackers to steal data without detection.
An undefined Chinese-speaking actor wields a combo of custom malware, open source tools, and LOTL binaries against Windows and Linux, likely for spying.