Microsoft Takes Down Malware-Signing Service Behind Ransomware Attacks

Microsoft on Tuesday said it disrupted a malware-signing-as-a-service MSaaS operation that weaponized the company's Artifact Signing system to deliver malicious code and conduct ransomware and other attacks, compromising thousands of machines and networks across the world. The tech giant attribut...

Vercel Finds More Compromised Accounts in Context.ai-Linked Breach

Vercel on Wednesday revealed that it has identified an additional set of customer accounts that were compromised as part of a security incident that enabled unauthorized access to its internal systems. The company said it made the discovery after expanding its investigation to include an extra se...

Microsoft Reveals ClickFix Campaign Using Windows Terminal to Deploy Lumma Stealer

Microsoft on Thursday disclosed details of a new widespread ClickFix social engineering campaign that has leveraged the Windows Terminal app as a way to activate a sophisticated attack chain and deploy the Lumma Stealer malware. The activity, observed in February 2026, makes use of the terminal...

The game is over: when “free” comes at too high a price. What we know about RenEngine

We often describe cases of malware distribution under the guise of game cheats and pirated software. Sometimes such methods are used to spread complex malware that employs advanced techniques and sophisticated infection chains. In February 2026, researchers from Howler Cell announced the discover...

Hackers Exploit c-ares DLL Side-Loading to Bypass Security and Deploy Malware

Security experts have disclosed details of an active malware campaign that's exploiting a DLL side-loading vulnerability in a legitimate binary associated with the open-source c-ares library to bypass security controls and deliver a wide range of commodity trojans and stealers. "Attackers achieve...

Increase in Lumma Stealer Activity Coincides with Use of Adaptive Browser Fingerprinting Tactics

In this blog entry, Trend™ Research analyses the layered command-and-control approaches that Lumma Stealer uses to maintain its ongoing operations while enhancing collection of victim-environment data...

Fake CAPTCHA sites now have tutorial videos to help victims install malware

Early on in 2025, I described how criminals used fake CAPTCHA sites and a clipboard hijacker to provide instructions for website visitors that would effectively infect their own machines with an information stealer known as the Lumma Stealer. ClickFix is the name researchers have since given to...

ThreatsDay Bulletin: $176M Crypto Fine, Hacking Formula 1, Chromium Vulns, AI Hijack & More

Criminals don’t need to be clever all the time; they just follow the easiest path in: trick users, exploit stale components, or abuse trusted systems like OAuth and package registries. If your stack or habits make any of those easy, you’re already a target. This week’s ThreatsDay highlights show...

Rival Hackers Dox Alleged Operators of Lumma Stealer

Rival hackers expose the alleged operators behind Lumma Stealer, a major data-theft malware, causing leaks and internal chaos that have slowed its growth...

Shifts in the Underground: The Impact of Water Kurita’s (Lumma Stealer) Doxxing

A targeted underground doxxing campaign exposed alleged core members of Lumma Stealer Water Kurita, resulting in a sharp decline in its activity and a migration of customers to rival infostealer platforms...

Dark Web Roast - September 2025 Edition

Dark Web Roast - September 2025 Edition By Trellix Advanced Research Center · October 14, 2025 Executive Summary September 2025 brought us a delightful buffet of underground incompetence that makes one wonder if cybercriminals are actively competing for the "Most Spectacular Failure" award. From...

Think before you Click(Fix): Analyzing the ClickFix social engineering technique

Over the past year, Microsoft Threat Intelligence and Microsoft Defender Experts have observed the ClickFix social engineering technique growing in popularity, with campaigns targeting thousands of enterprise and end-user devices globally every day. Since early 2024, we’ve helped multiple custome...

Think before you Click(Fix): Analyzing the ClickFix social engineering technique

Over the past year, Microsoft Threat Intelligence and Microsoft Defender Experts have observed the ClickFix social engineering technique growing in popularity, with campaigns targeting thousands of enterprise and end-user devices globally every day. Since early 2024, we’ve helped multiple custome...

Back to Business: Lumma Stealer Returns with Stealthier Methods

Lumma Stealer has re-emerged shortly after its takedown. This time, the cybergroup behind this malware appears to be intent on employing more covert tactics while steadily expanding its reach. This article shares the latest methods used to propagate this threat...

Hackers Use Leaked Shellter Tool License to Spread Lumma Stealer and SectopRAT Malware

In yet another instance of threat actors repurposing legitimate tools for malicious purposes, it has been discovered that hackers are exploiting a popular red teaming tool called Shellter to distribute stealer malware. The company behind the software said a company that had recently purchased...

⚡ Weekly Recap: APT Campaigns, Browser Hijacks, AI Malware, Cloud Breaches and Critical CVEs

Cyber threats don't show up one at a time anymore. They're layered, planned, and often stay hidden until it's too late. For cybersecurity teams, the key isn't just reacting to alerts—it's spotting early signs of trouble before they become real threats. This update is designed to deliver clear,...

FBI and Europol Disrupt Lumma Stealer Malware Network Linked to 10 Million Infections

A sprawling operation undertaken by global law enforcement agencies and a consortium of private sector firms has disrupted the online infrastructure associated with a commodity information stealer known as Lumma aka LummaC or LummaC2, seizing 2,300 domains that acted as the command-and-control C2...

Microsoft Dismantles Lumma Stealer Network, Seizes 2,000+ Domains

Microsoft disrupts Lumma Stealer network, seizing 2,000 domains linked to 394,000 infections in global cybercrime crackdown with law enforcement partners...

Lumma Stealer: Breaking down the delivery techniques and capabilities of a prolific infostealer

Over the past year, Microsoft observed the persistent growth and operational sophistication of Lumma Stealer, an infostealer malware used by multiple financially motivated threat actors to target various industries. Our investigation into Lumma Stealer’s distribution infrastructure reveals a...

Lumma Stealer – Tracking distribution channels

Introduction The evolution of Malware-as-a-Service MaaS has significantly lowered the barriers to entry for cybercriminals, with information stealers becoming one of the most commercially successful categories in this underground economy. Among these threats, Lumma Stealer has emerged as a...