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Multiple state-sponsored hacking groups from Iran, North Korea, and Russia have been found leveraging the increasingly popular ClickFix social engineering tactic to deploy malware over a three-month period from late 2024 through the beginning of 2025. The phishing campaigns adopting the strategy have been attributed to clusters tracked as TA427 (aka Kimsuky), TA450 (aka MuddyWater), UNK_RemoteRogue, and TA422 (aka APT28). ClickFix has been an initial access technique primarily affiliated with cybercrime groups, although the effectiveness of the approach has led to it also being adopted by nation-state groups. "The incorporation of ClickFix is not revolutionizing the campaigns carried out by TA427, TA450, UNK_RemoteRogue, and TA422 but instead is replacing the installation and execution stages in existing infection chains," enterprise security firm Proofpoint said in a report published today. ClickFix , in a nutshell, refers to a sneaky technique that tricks users int...

Cybersecurity researchers have spotted a new cyberattack that is believed to be the very first but an amateur attempt to weaponize the infamous BlueKeep RDP vulnerability in the wild to mass compromise vulnerable systems for cryptocurrency mining. In May this year, Microsoft released a patch for a highly-critical remote code execution flaw, dubbed  BlueKeep , in its Windows Remote Desktop Services that could be exploited remotely to take full control over vulnerable systems just by sending specially crafted requests over RDP. BlueKeep, tracked as CVE-2019-0708 , is a wormable vulnerability because it can be weaponized by potential malware to propagate itself from one vulnerable computer to another automatically without requiring victims' interaction. BlueKeep has been considered to be such a serious threat that since its discovery, Microsoft and even government agencies [ NSA and GCHQ ] had continuously been encouraging Windows users and admins to apply security p...

Threat actors with ties to North Korea have been observed targeting Web3 and cryptocurrency-related businesses with malware written in the Nim programming language, underscoring a constant evolution of their tactics. "Unusually for macOS malware, the threat actors employ a process injection technique and remote communications via wss, the TLS-encrypted version of the WebSocket protocol," SentinelOne researchers Phil Stokes and Raffaele Sabato said in a report shared with The Hacker News. "A novel persistence mechanism takes advantage of SIGINT/SIGTERM signal handlers to install persistence when the malware is terminated or the system rebooted." The cybersecurity company is tracking the malware components collectively under the name NimDoor. It's worth noting that some aspects of the campaign were previously documented by Huntabil.IT and later by Huntress and Validin , but with differences in the payloads deployed. The attack chains involve social enginee...

Cybersecurity researchers have shed light on a Linux variant of a relatively new ransomware strain called Helldown, suggesting that the threat actors are broadening their attack focus. "Helldown deploys Windows ransomware derived from the LockBit 3.0 code," Sekoia said in a report shared with The Hacker News. "Given the recent development of ransomware targeting ESX, it appears that the group could be evolving its current operations to target virtualized infrastructures via VMware." Helldown was first publicly documented by Halcyon in mid-August 2024, describing it as an "aggressive ransomware group" that infiltrates target networks by exploiting security vulnerabilities. Some of the prominent sectors targeted by the cybercrime group include IT services, telecommunications, manufacturing, and healthcare. Like other ransomware crews, Helldown is known for leveraging data leak sites to pressure victims into paying ransoms by threatening to publish s...

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Friday formally added a critical security flaw impacting React Server Components (RSC) to its Known Exploited Vulnerabilities ( KEV ) catalog following reports of active exploitation in the wild. The vulnerability, CVE-2025-55182 (CVSS score: 10.0), relates to a case of remote code execution that could be triggered by an unauthenticated attacker without requiring any special setup. It's also tracked as React2Shell. "Meta React Server Components contains a remote code execution vulnerability that could allow unauthenticated remote code execution by exploiting a flaw in how React decodes payloads sent to React Server Function endpoints," CISA said in an advisory. The problem stems from insecure deserialization in the library's Flight protocol, which React uses to communicate between a server and client. As a result, it leads to a scenario where an unauthenticated, remote attacker can execute arbi...

Cybersecurity researchers have uncovered an ongoing malvertising campaign that abuses Meta's advertising platform and hijacked Facebook accounts to distribute an information stealer known as SYS01stealer. "The hackers behind the campaign use trusted brands to expand their reach," Bitdefender Labs said in a report shared with The Hacker News. "The malvertising campaign leverages nearly a hundred malicious domains, utilized not only for distributing the malware but also for live command and control (C2) operations, allowing threat actors to manage the attack in real-time." SYS01stealer was first documented by Morphisec in early 2023, describing attack campaigns targeting Facebook business accounts using Google ads and fake Facebook profiles that promote games, adult content, and cracked software. Like other stealer malware, the end goal is to steal login credentials, browsing history, and cookies. But it's also focused on obtaining Facebook ad and busin...

Cybersecurity researchers today uncovered a new advanced version of ComRAT backdoor, one of the earliest known backdoors used by the Turla APT group, that leverages Gmail's web interface to covertly receive commands and exfiltrate sensitive data. "ComRAT v4 was first seen in 2017 and known still to be in use as recently as January 2020," cybersecurity firm ESET said in a report shared with The Hacker News. "We identified at least three targets: two Ministries of Foreign Affairs in Eastern Europe and a national parliament in the Caucasus region." Turla , also known as Snake, has been active for over a decade with a long history of the watering hole and spear-phishing campaigns against embassies and military organizations at least since 2004. The group's espionage platform started off as Agent.BTZ , in 2007, before it evolved to ComRAT , in addition to gaining additional capabilities to achieve persistence and to steal data from a local network. It...

If this had been a security drill, someone would've said it went too far. But it wasn't a drill—it was real. The access? Everything looked normal. The tools? Easy to find. The detection? Came too late. This is how attacks happen now—quiet, convincing, and fast. Defenders aren't just chasing hackers anymore—they're struggling to trust what their systems are telling them. The problem isn't too few alerts. It's too many, with no clear meaning. One thing is clear: if your defense still waits for obvious signs, you're not protecting anything. You're just watching it happen. This recap highlights the moments that mattered—and why they're worth your attention. ⚡ Threat of the Week APT41 Exploits Google Calendar for Command-and-Control — The Chinese state-sponsored threat actor known as APT41 deployed a malware called TOUGHPROGRESS that uses Google Calendar for command-and-control (C2). Google said it observed the spear-phishing attacks in October 2024 and that the malware was hosted on...

A major telecommunications company located in Asia was allegedly breached by Chinese state-sponsored hackers who spent over four years inside its systems, according to a new report from incident response firm Sygnia. The cybersecurity company is tracking the activity under the name Weaver Ant , describing the threat actor as stealthy and highly persistent. The name of the telecom provider was not disclosed. "Using web shells and tunneling, the attackers maintained persistence and facilitated cyber espionage," Sygnia said . "The group behind this intrusion [...] aimed to gain and maintain continuous access to telecommunication providers and facilitate cyber espionage by collecting sensitive information." Oren Biderman, Incident Response and Digital Forensic Team Leader at Sygnia, told The Hacker News that Weaver Ant exploited a misconfiguration in a public-facing application to obtain an initial foothold into the target environment. The attack chain is said to h...

Last week's cyber news in 2025 was not about one big incident. It was about many small cracks opening at the same time. Tools people trust every day behave in unexpected ways. Old flaws resurfaced. New ones were used almost immediately. A common theme ran through it all in 2025. Attackers moved faster than fixes. Access meant for work, updates, or support kept getting abused. And damage did not stop when an incident was "over" — it continued to surface months or even years later. This weekly recap brings those stories together in one place. No overload, no noise. Read on to see what shaped the threat landscape in the final stretch of 2025 and what deserves your attention now. ⚡ Threat of the Week MongoDB Vulnerability Comes Under Attack — A newly disclosed security vulnerability in MongoDB has come under active exploitation in the wild, with over 87,000 potentially susceptible instances identified across the world. The vulnerability in question is CVE-2025-14847 (CVSS score: 8.7)...

Attacks that target users in their web browsers have seen an unprecedented rise in recent years. In this article, we'll explore what a "browser-based attack" is, and why they're proving to be so effective.  What is a browser-based attack? First, it's important to establish what a browser-based attack is. In most scenarios, attackers don't think of themselves as attacking your web browser. Their end-goal is to compromise your business apps and data. That means going after the third-party services that are now the backbone of business IT. The most common attack path today sees attackers log into third-party services, dump the data, and monetize it through extortion. You need only look at last year's Snowflake customer breaches or the still-ongoing Salesforce attacks to see the impact.  The most logical way to do this is by targeting users of those apps. And because of the changes to working practices, your users are more accessible than ever to external attackers — and ex...

Unknown malware presents a significant cybersecurity threat and can cause serious damage to organizations and individuals alike. When left undetected, malicious code can gain access to confidential information, corrupt data, and allow attackers to gain control of systems. Find out how to avoid these circumstances and detect unknown malicious behavior efficiently.  Challenges of new threats' detection While known malware families are more predictable and can be detected more easily, unknown threats can take on a variety of forms, causing a bunch of challenges for their detection: Malware developers use polymorphism, which enables them to modify the malicious code to generate unique variants of the same malware.  There is malware that is still not identified and doesn't have any rulesets for detection. Some threats can be Fully UnDetectable (FUD) for some time and challenge perimeter security.  The code is often encrypted, making it difficult to detect by signature-...