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.
A threat group tracked as UNC6692 uses social engineering to deploy a new, custom malware suite named 'Snow' which includes a browser extension, a tunneler, and a backdoor. [...]
Coming in cold with custom Snow malware
Coming in cold with custom Snow malware A previously unknown threat group using tried-and-tested social engineering tactics - Microsoft Teams chat invitations and helpdesk staff impersonation - is also using custom malware in its data-stealing attacks, according to Google's Threat Intelligence Group.…
Cybersecurity researchers have discovered a new Lua-based malware created years before the notorious Stuxnet worm that aimed to sabotage Iran's nuclear program by destroying uranium enrichment centrifuges
Cybersecurity agencies in the U.S. and U.K. are warning about a custom malware called Firestarter persisting on Cisco Firepower and Secure Firewall devices running Adaptive Security Appliance (ASA) or Firepower Threat Defense (FTD) software. [...]
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has revealed that an unnamed federal civilian agency's Cisco Firepower device running Adaptive Security Appliance (ASA) software was compromised in September 2025 with a new malware called FIRESTARTER
Latest in long-running pwning of Cisco kit found in mystery Fed agency A US federal agency was successfully targeted by a previously unknown backdoor malware called Firestarter, according to CISA cybersnoops and their UK counterparts – neither of which disclosed the agency's name.…
Malicious npm packages spread via worm-like propagation and steal developer credentials
FAST16 could be the first cyberweapon, and its effects could be with us today
FAST16 could be the first cyberweapon, and its effects could be with us today Black Hat Asia Infosec outfit SentinelOne found malware that tries to induce errors in engineering and physics simulation software and therefore represents an attempt at sabotage, and suggests it was created years before the Stuxnet worm that aimed to destroy Iran’s uranium enrichment centrifuges.…
Investigators found the malware, dubbed Firestarter, on a federal agency's network in a campaign dating back to at least September 2025. The post US, UK agencies warn hackers were hiding on Cisco firewalls long after patches were applied appeared first on CyberScoop.
ZionSiphon was designed to find and sabotage Israelis’ water supply. An OT expert said it appears to be ineffective and the work of amateurs using AI. The post Dragos: Despite AI use, new malware targeting water plants is ‘hype’ appeared first on CyberScoop.
A previously undocumented threat activity cluster known as UNC6692 has been observed leveraging social engineering tactics via Microsoft Teams to deploy a custom malware suite on compromised hosts
Orgs can now buy UK cyber agency engineered commercial gadget, but details are slim GCHQ's cyber arm has entered the hardware game with its first device designed to prevent cyberattacks on display devices.…
Eset Researchers Discover Trove of Go-Based MalwareResearchers uncovered a Chinese-linked cyberespionage group after attackers left command and control credentials embedded in malware, exposing internal operations, testing environments and thousands of messages tied to campaigns targeting a Mongolia government agency.
CISA and NCSC co-released a Malware Analysis Report today on a Cisco ASA/Firepower backdoor that patching does not remove. Here is what it does, why Sigma will not save you, and what to do this week.
A new Mirai-based malware campaign is actively exploiting CVE-2025-29635, a high-severity command-injection vulnerability affecting D-Link DIR-823X routers, to enlist devices into the botnet. [...]
The threat actor known as Harvester has been attributed to a new Linux version of its GoGra backdoor deployed as part of attacks likely targeting entities in South Asia
A compromised developer's repository serves as a worm-like infection vector to spread remote access Trojans (RATs) and other malware.
Cybersecurity researchers have discovered a previously undocumented data wiper that has been used in attacks targeting Venezuela at the end of last year and the start of 2026