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.
Threat actors have been using multiple websites promoted through Google ads to distribute a convincing PDF editing app that delivers an info-stealing malware called TamperedChef. [...]
An abandoned update server associated with input method editor (IME) software Sogou Zhuyin was leveraged by threat actors as part of an espionage campaign to deliver several malware families, including C6DOOR and GTELAM, in attacks primarily targeting users across Eastern Asia
A software supply chain attack targeting Nx marks the first known case where attackers have leveraged developer AI assistants, according to StepSecurity
Cybersecurity researchers have discovered a cybercrime campaign that's using malvertising tricks to direct victims to fraudulent sites to deliver a new information stealer called TamperedChef
Anthropic's Claude Code large language model has been abused by threat actors who used it in data extortion campaigns and to develop ransomware packages. [...]
The TAOTH campaign exploited abandoned software and spear-phishing to deploy multiple malware families, targeting dissidents and other high-value individuals across Eastern Asia.
The financially motivated threat actor known as Storm-0501 has been observed refining its tactics to conduct data exfiltration and extortion attacks targeting cloud environments
Google is introducing a new defense for Android called 'Developer Verification' to block malware installations from sideloaded apps sourced from outside the official Google Play app store. [...]
Google is introducing a new defense for Android called 'Developer Verification' to block malware installations from sideloaded apps sourced from outside the official Google Play app store. [...]
State-sponsored hackers linked to the Mustang Panda activity cluster targeted diplomats by hijacking web traffic to redirect to a malware serving website. [...]
Oh, look, a use case for OpenAI's gpt-oss-20b model ESET malware researchers Anton Cherepanov and Peter Strycek have discovered what they describe as the "first known AI-powered ransomware," which they named PromptLock. …
Malicious Prompts Hidden in Data can Trigger Executable PayloadsHackers can transform artificial intelligence-powered summarization tools into unwitting delivery agents for ransomware instructions through hidden code and prompt manipulation, security researchers warn. The method is an evolution of ClickFix, a social engineering tactic.
New features to take over smartphones and monitor user activity demonstrate the continued evolution of the malware, which is now being spread on GitHub.
A global phishing campaign has been identified using personalized emails and fake websites to deliver malware via UpCrypter
Cybersecurity researchers are calling attention to a sophisticated social engineering campaign that's targeting supply chain-critical manufacturing companies with an in-memory malware dubbed MixShell
A new large-scale campaign has been observed exploiting over 100 compromised WordPress sites to direct site visitors to fake CAPTCHA verification pages that employ the ClickFix social engineering tactic to deliver information stealers, ransomware, and cryptocurrency miners
Everything's fine, the ad slinger assures us Cloud security vendor Zscaler says customers of Google’s Play Store have downloaded more than 19 million instances of malware-laden apps that evaded the web giant’s security scans.…
Because instructions appear to come from AI-generated content summaries and not an external source, the victim is more likely to follow them without suspicion.
Seventy-seven malicious Android apps containing different types of malware were found on Google Play after being downloaded more than 19 million times. [...]
Cybersecurity researchers have flagged a new phishing campaign that's using fake voicemails and purchase orders to deliver a malware loader called UpCrypter