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.
Security researchers have discovered a malicious campaign by the 'Witchetty' hacking group, which uses steganography to hide a backdoor malware in a Windows logo. [...]
Hackers have found a new method to establish persistence on VMware ESXi hypervisors to control vCenter servers and virtual machines for Windows and Linux while avoiding detection. [...]
Security analysts have observed three new versions of Prilex this year, indicating that the authors and operators of the PoS-targeting malware are back to action. [...]
A quickly expanding botnet called Chaos is targeting and infecting Windows and Linux devices to use them for cryptomining and launching DDoS attacks. [...]
A new malware dropper named 'NullMixer' is infecting Windows devices with a dozen different malware families simultaneously through fake software cracks promoted on malicious sites in Google Search results. [...]
The North Korean Lazarus hacking group is now using fake 'Crypto.com' job offers to hack developers and artists in the crypto space, likely with a long-term goal of stealing digital assets and cryptocurrency. [...]
The new 'Erbium' information-stealing malware is being distributed as fake cracks and cheats for popular video games to steal victims' credentials and cryptocurrency wallets. [...]
Hackers believed to work for Russia have started using a new code execution technique that relies on mouse movement in Microsoft PowerPoint presentations to trigger a malicious PowerShell script. [...]
Data exfiltration malware known as Exmatter and previously linked with the BlackMatter ransomware group is now being upgraded with data corruption functionality that may indicate a new tactic that ransomware affiliates might switch to in the future. [...]