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.
Initial access brokers are using the new downloader malware, which emerged just after QBot's 2023 disruption.
Latest campaign underscores wide-ranging functionality and staying power of a decade-old piece of information-stealing malware.
UNAPIMON works by meticulously disabling hooks in Windows APIs for detecting malicious processes.
Campaign distributes malware disguised as legitimate installers for popular workplace collaboration apps by abusing a traffic-tracking feature.
Had a Microsoft developer not spotted the malware when he did, the outcome could have been much worse.