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.
Cybercriminals are abusing Microsoft's Trusted Signing platform to code-sign malware executables with short-lived three-day certificates. [...]
Cybercriminals are abusing Microsoft's Trusted Signing platform to code-sign malware executables with short-lived three-day certificates. [...]
Valve has removed a game titled 'Sniper: Phantom's Resolution' from the Steam store following multiple user reports that indicated its demo installer actually infected their systems with information stealing malware. [...]
The threat actors behind the Medusa ransomware-as-a-service (RaaS) operation have been observed using a malicious driver dubbed ABYSSWORKER as part of a bring your own vulnerable driver (BYOVD) attack designed to disable anti-malware tools
Attackers are exploiting user familiarity with CAPTCHAs to distribute the Lumma Stealer RAT via malicious PowerShell commands, according to HP
The China-linked advanced persistent threat (APT) group. known as Aquatic Panda has been linked to a "global espionage campaign" that took place in 2022 targeting seven organizations
Also: France Temporarily Lifts Pavel Durov's Travel Ban Amid Telegram ProbeThis week, Paragon Solutions spread through WhatsApp, France suspended Pavel Durov's travel ban, Vapor malware hit 60M Android users, state-backed hackers exploit a Windows flaw, Western Alliance Bank exposed customers data, Apple fixed a passwords bug, and a sperm bank exposed customer information.
YouTube videos promoting game cheats are being used to deliver a previously undocumented stealer malware called Arcane likely targeting Russian-speaking users
Both Android devices and iPhones are 3.5 times more likely to be infected with malware once "broken" and 250 times more likely to be totally compromised, recent research shows.
A malware operation dubbed 'DollyWay' has been underway since 2016, compromising over 20,000 WordPress sites globally to redirect users to malicious sites. [...]
Ukraine's Computer Emergency Response Team (CERT-UA) is warning about highly targeted attacks employing compromised Signal accounts to send malware to employees of defense industry firms and members of the country's army forces. [...]
Paste-and-Run Schemes Trick Users Into Running Attacker-Provided Malicious CodeSocial engineering tactics designed to trick users into installing malware, oftentimes by "fixing" a fake problem, are growing more common. Experts say a majority of these ClickFix - aka ClearFix or paste-and-run - attacks now lead to information-stealing malware infections.
A newly discovered information-stealing malware called Arcane is stealing extensive user data, including VPN account credentials, gaming clients, messaging apps, and information stored in web browsers. [...]
The threat actors behind the ClearFake campaign are using fake reCAPTCHA or Cloudflare Turnstile verifications as lures to trick users into downloading malware such as Lumma Stealer and Vidar Stealer
The sneaky malware packs capabilities for system reconnaissance as well as credential and cryptocurrency theft.
A Cato Networks researcher discovered a new LLM jailbreaking technique enabling the creation of password-stealing malware
MirrorFace Expands Operations, Revives Anel Backdoor for EspionageA threat actor associated with Chinese cyberespionage campaigns against Japan stepped outside its East Asian comfort zone to target a European organization with a refreshed set of hacking tools. A hacking group tracked as MirrorFace and Earth Kasha deployed a backdoor once exclusively used by APT10.
Threat hunters have shed more light on a previously disclosed malware campaign undertaken by the China-aligned MirrorFace threat actor that targeted a diplomatic organization in the European Union with a backdoor known as ANEL
Microsoft is calling attention to a novel remote access trojan (RAT) named StilachiRAT that it said employs advanced techniques to sidestep detection and persist within target environments with an ultimate aim to steal sensitive data
In a cyber twist, attackers behind two of the campaigns are using the apps to redirect users to phishing and malware distribution sites.