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Krebs - Anti-DDoS Firm Heaped Attacks on Brazilian ISPs

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A Brazilian tech firm that specializes in protecting networks from distributed denial-of-service (DDoS) attacks has been enabling a botnet responsible for an extended campaign of massive DDoS attacks against other network operators in Brazil, KrebsOnSecurity has learned. The firm’s chief executive says the malicious activity resulted from a security breach and was likely the work of a competitor trying to tarnish his company’s public image. An Archer AX21 router from TP-Link. Image: tp-link.com. For the past several years, security experts have tracked a series of massive DDoS attacks originating from Brazil and solely targeting Brazilian ISPs. Until recently, it was less than clear who or what was behind these digital sieges. That changed earlier this month when a trusted source who asked to remain anonymous shared a curious file archive that was exposed in an open directory online. The exposed archive contained several Portuguese-language malicious programs written in Python. It...
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The Hacker News - ThreatsDay Bulletin: SMS Blaster Busts, OpenEMR Flaws, 600K Roblox Hacks and 25 More Stories

The internet is noisy this week. We are seeing some wild new tactics, like people using fake cell towers to send scam texts, while some developers are accidentally downloading tools that peek into their private files during a simple install. It is definitely a busy time to be online. Security is always a moving target. Millions of servers are currently sitting online without any passwords, and from The Hacker News https://thehackernews.com/2026/04/threatsday-bulletin-sms-blaster-busts.html
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KnowBe4 - Why Your Email Security Needs a Global Human Network to Close the Detection Gap

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The biggest challenge in email security today isn’t just detecting a threat; it’s the speed of response across a global landscape. As we head into the second half of 2026, the stakes with speed have gotten higher. According to SQ Magazine, AI-generated phishing attempts are 68% harder to detect than they were just a year ago, and the average cost of an AI-powered breach has climbed to $5.72 million. from KnowBe4 Blog https://blog.knowbe4.com/global-human-network-closes-email-detection-gap
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The Hacker News - EtherRAT Distribution Spoofing Administrative Tools via GitHub Facades

Intro A sophisticated, high-resilience malicious campaign was identified by Atos Threat Research Center (TRC) in March 2026. This operation specifically targets the high-privilege professional accounts of enterprise administrators, DevOps engineers, and security analysts by impersonating administrative utilities they rely on for daily operations. By integrating Search Engine Order (SEO) from The Hacker News https://thehackernews.com/2026/04/etherrat-distribution-spoofing.html
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Schneier - Fast16 Malware

Researchers have reverse-engineered a piece of malware named Fast16. It’s almost certainly state-sponsored, probably US in origin, and was deployed against Iran years before Stuxnet: “…the Fast16 malware was designed to carry out the most subtle form of sabotage ever seen in an in-the-wild malware tool: By automatically spreading across networks and then silently manipulating computation processes in certain software applications that perform high-precision mathematical calculations and simulate physical phenomena, Fast16 can alter the results of those programs to cause failures that range from faulty research results to catastrophic damage to real-world equipment.” Another news article . Lots of interesting details at the links. from Schneier on Security https://www.schneier.com/blog/archives/2026/04/fast16-malware.html
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The Hacker News - New Linux 'Copy Fail' Vulnerability Enables Root Access on Major Distributions

Cybersecurity researchers have disclosed details of a Linux local privilege escalation (LPE) flaw that could allow an unprivileged local user to obtain root. The high-severity vulnerability tracked as CVE-2026-31431 (CVSS score: 7.8) has been codenamed Copy Fail by Xint.io and Theori. "An unprivileged local user can write four controlled bytes into the page cache of any readable file on a Linux from The Hacker News https://thehackernews.com/2026/04/new-linux-copy-fail-vulnerability.html
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The Hacker News - New Wave of DPRK Attacks Uses AI-Inserted npm Malware, Fake Firms, and RATs

Cybersecurity researchers have discovered malicious code in an npm package after a malicious package as a dependency to the project by Anthropic's Claude Opus large language model (LLM). The package in question is "@validate-sdk/v2," which is listed on npm as a utility software development kit (SDK) for hashing, validation, encoding/decoding, and secure random generation. However, its real from The Hacker News https://thehackernews.com/2026/04/new-wave-of-dprk-attacks-uses-ai.html
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