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 decades-old "finger" command is making a comeback,, with threat actors using the protocol to retrieve remote commands to execute on Windows devices. [...]
The ImunifyAV malware scanner for Linux server, used by tens of millions of websites, is vulnerable to a remote code execution vulnerability that could be exploited to compromise the hosting environment. [...]
Uhale Android-based digital picture frames come with multiple critical security vulnerabilities and some of them download and execute malware at boot time. [...]
Law enforcement authorities from 9 countries have taken down 1,025 servers used by the Rhadamanthys infolstealer, VenomRAT, and Elysium botnet malware operations in the latest phase of Operation Endgame, an international action targeting cybercrime. [...]
The DanaBot malware has returned with a new version observed in attacks, six-months after law enforcement's Operation Endgame disrupted its activity in May. [...]
An advanced threat actor exploited the critical vulnerabilities "Citrix Bleed 2" (CVE-2025-5777) in NetScaler ADC and Gateway, and CVE-2025-20337 affecting Cisco Identity Service Engine (ISE) as zero-days to deploy custom malware. [...]
The Rhadamanthys infostealer operation has been disrupted, with numerous "customers" of the malware-as-a-service reporting that they no longer have access to their servers. [...]