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.
Cybersecurity researchers have detailed the inner workings of an Android banking trojan called ERMAC 3.0, uncovering serious shortcomings in the operators' infrastructure
The threat actor known as EncryptHub is continuing to exploit a now-patched security flaw impacting Microsoft Windows to deliver malicious payloads
Some custom malware, some legit software tools At least a dozen ransomware gangs have incorporated kernel-level EDR killers into their malware arsenal, allowing them to bypass almost every major endpoint security tool on the market, escalate privileges, and ultimately steal and encrypt data before extorting victims into paying a ransom.…
Report North Korean Hacking Group Adds Ransomware to Traditional PlaybookA ScarCruft subgroup dubbed "ChinopuNK" has launched a disruptive ransomware campaign across South Korea, using phishing lures, AutoIt loaders and microphone-capturing malware - marking a major change in the North Korean hacking group's traditionally espionage-focused cyber tactics.
An ongoing malware campaign has been observed using malvertising to deliver PS1Bot, a PowerShell-based framework
Threat actors are leveraging a Unicode character to make phishing links appear like legitimate Booking.com links in a new campaign distributing malware. The attack makes use of the Japanese hiragana character, ん, which can, on some systems, appear as a forward slash and make a phishing URL appear realistic to a person at first. [...]
Cybersecurity researchers have disclosed a new Android trojan called PhantomCard that abuses near-field communication (NFC) to conduct relay attacks for facilitating fraudulent transactions in attacks targeting banking customers in Brazil
Crypto24 is a ransomware group that stealthily blends legitimate tools with custom malware, using advanced evasion techniques to bypass security and EDR technologies.
DPRK hackers are throwing every kind of malware at the wall and seeing what sticks, deploying stealers, backdoors, and ransomware all at once.
Cybersecurity researchers have discovered a new malvertising campaign that's designed to infect victims with a multi-stage malware framework called PS1Bot
Microsoft today released updates to fix more than 100 security flaws in its Windows operating systems and other software. At least 13 of the bugs received Microsoft's most-dire "critical" rating, meaning they could be abused by malware or malcontents to gain remote access to a Windows system with little or no help from users.
The first documented deployment of the novel malware in a campaign against the Middle Eastern public sector and aviation industry may be tied to China's state-sponsored actor Earth Baxia.
A new cyber-espionage threat group has been using a new backdoor malware that provides persistent access through a seemingly inactive scheduled task. [...]
Researchers have released a report detailing how a recent WinRAR path traversal vulnerability tracked as CVE-2025-8088 was exploited in zero-day attacks by the Russian 'RomCom' hacking group to drop different malware payloads. [...]
A flaw in WinRAR, tracked as CVE-2025-8088, has been exploited by the RomCom group to deploy malware