Fake CAPTCHA “Fix” Tricks Users Into Running Malware

The Hacker News · Medium sophistication
Last updated September 3, 2026

Multiple real-world intrusions used a ClickFix-style lure where victims visiting compromised websites saw fake CAPTCHA prompts and were tricked into running a command themselves. Separately, attackers also abused the legitimate, signed Node.js runtime (node.exe) to run malicious JavaScript while appearing like normal developer activity. The campaigns affected a wide range of organizations, including government, technology, hotels, fintech, and other businesses.

Key findings

  • Attackers used the legitimate, signed Node.js runtime (node.exe) to execute malicious JavaScript while reducing the chance of signature-based detection.
  • Initial access in multiple cases was obtained via the ClickFix social-engineering technique, often presented as a fake error fix or fake CAPTCHA verification.
  • GuidePoint reported at least 31 organizations compromised via ClickFix, with compromised websites used to deliver the lure to visitors.
  • Some attacks used EtherHiding, leveraging a blockchain (Polygon mentioned) as a dynamic way to locate command-and-control infrastructure.
  • Observed targets included government departments, technology companies, hotels, and a U.S. fintech organization.

Who’s being targeted

  • Commonly targeted roles: All employees, Executive assistants, Finance, IT helpdesk, Web/Marketing teams (site owners), Security operations (SOC).
  • Affected industries: Government, Technology, Hospitality (Hotels), Financial Technology (FinTech), E-commerce, Professional Services, Retail logistics.
  • Attack channels: website.
  • Impersonated: Website security verification (CAPTCHA / anti-bot prompt).

Awareness takeaways

  • Train staff that legitimate websites should never require them to copy/paste and run commands to ‘verify’ or ‘fix’ access, treat this as an immediate stop-and-report event.
  • Reduce exposure by continuously monitoring public-facing websites for unauthorized changes and injected scripts (especially on pages that customers and employees commonly visit).
  • Limit and control browser extensions; block unapproved extensions and investigate prompts that encourage installing ‘security’ tools.
  • Assume attackers may rotate their command-and-control quickly; rely on layered defenses and user reporting rather than only blocking a single domain/IP.

Red flags to watch for

  • A CAPTCHA/verification prompt asking you to run a command on your computer
  • Instructions to use Windows Run or Windows Terminal as part of a website verification
  • Unexpected “fix this error” steps that involve copying/pasting commands
Try Mirage

Mirage safely runs attacks like this one against your own team, so you find out what happens before a real adversary does.

Get a demo
Read the video transcript

You land on a normal site, and a CAPTCHA pops up: “Please verify you are not a robot. Follow the steps below to continue.” This is ClickFix. The page tells you to copy a long command and paste it into Windows Run or Windows Terminal. When you do, it quietly pulls down malware and runs it using the legit Node.js runtime, node.exe, so it looks like normal developer activity. GuidePoint has seen at least 31 organizations hit this way, government, tech, hotels, even a U.S. fintech, just by visiting compromised sites with this fake CAPTCHA or “fix this error” box. A real website will never ask you to run a command to prove you’re not a bot. If any page tells you to paste something into Windows Run or Terminal, stop immediately and report it to Security.

Similar attacks

Fake Resumes + Watering Holes Hit AnySign4PC Users

Fake Resumes + Watering Holes Hit AnySign4PC Users

A state-sponsored campaign in South Korea used spear-phishing and hacked “trusted” local websites to infect visitors who had vulnerable AnySign4PC installed. In some cases, simply visiting a compromised page triggered the exploit and installed SIGNBT or COPPERHEDGE backdoors without any download…

July 30, 2026
Fake CAPTCHA Tricks Users Into Running Malware

Fake CAPTCHA Tricks Users Into Running Malware

Researchers found a criminal operation (StopAndProtect) that used nearly 2,000 hacked WordPress sites as a delivery network. Visitors were shown a fake CAPTCHA that pressured them to copy and run a PowerShell command, which then installed malware that could steal data, capture screenshots, and…

August 20, 2026
Spy Groups Phish Victims Into Chrome Exploit Kit

Spy Groups Phish Victims Into Chrome Exploit Kit

Researchers reported four separate espionage groups using the same “BlueMoon” exploit kit within days, targeting organizations in the US and Southeast Asia. The attacks began with phishing emails that lured recipients to attacker-controlled websites, where Chrome and Windows vulnerabilities were…

September 10, 2026
Fake CAPTCHA on Hacked WordPress Spreads Malware

Fake CAPTCHA on Hacked WordPress Spreads Malware

Researchers described a real cybercrime operation (“StopAndProtect”) that compromised nearly 2,000 WordPress sites and used them to show fake CAPTCHA pages that trick visitors into running malicious commands. Victims can end up with malware that steals files and screenshots and, in some cases,…

August 19, 2026
Fake Zoom/Adobe Updates Drop ScreenConnect Backdoor

Fake Zoom/Adobe Updates Drop ScreenConnect Backdoor

Researchers described an active phishing campaign that tricks people with fake Adobe/Zoom update and “document review” themes to install the legitimate ScreenConnect remote-access tool. Once installed, attackers get persistent remote control of the victim’s computer while blending in as normal IT…

August 4, 2026
Fake Gmail Attachment Lure Drops Antino Backdoor

Fake Gmail Attachment Lure Drops Antino Backdoor

A China-nexus threat group targeted government and policy organizations across Asia using spear-phishing emails tailored to the victim’s interests. The emails used spoofed trusted senders and a realistic fake Gmail attachment preview that linked to attacker-controlled pages, ultimately installing…

October 2, 2026