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.
IOCONTROL, a custom-built IoT/OT malware, was used by Iran-affiliated groups to attack Israel- and US-based OT/IoT devices, according to Claroty
Cyber-attacks involving Remcos RAT surged in Q3 2024, enabling attackers to control victim machines remotely, steal data and carry out espionage
Microsoft detailed how Russian espionage group Secret Blizzard is leveraging infrastructure of other threat actors to target the Ukrainian military with custom malware
The US government has sanctioned Sichuan Silence and one of its employees for the mass compromise of firewalls which led to the deployment of malware and ransomware
New AppLite Banker malware targets Android devices, employing advanced phishing techniques to steal credentials and data