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.
Microsoft has shared more information on what types of malicious embedded files OneNote will soon block to defend users against ongoing phishing attacks pushing malware. [...]
Multiple malware botnets actively target Cacti and Realtek vulnerabilities in campaigns detected between January and March 2023, spreading ShellBot and Moobot malware. [...]
A surge of trojanized Tor Browser installers targets Russians and Eastern Europeans with clipboard-hijacking malware that steals infected users' cryptocurrency transactions. [...]
New IcedID variants have been found without the usual online banking fraud functionality and instead focus on installing further malware on compromised systems. [...]
A new info-stealing malware named MacStealer is targeting Mac users, stealing their credentials stored in the iCloud KeyChain and web browsers, cryptocurrency wallets, and potentially sensitive files. [...]
A new Emotet phishing campaign is targeting U.S. taxpayers by impersonating W-9 tax forms allegedly sent by the Internal Revenue Service and companies you work with. [...]