Ukraine's computer emergency response team, CERT-UA, has warned that Russian hackers are using fake CAPTCHA checks to trick people into compromising their own PCs. The Kremlin-backed Sandworm hacking group is reportedly leveraging fake CAPTCHA checks on compromised websites that persuade users to execute a PowerShell command on their computers - tricking them into running malicious code. The latest attacks begin when a user visits a compromised webpage, where they're greeted by a fake CAPTCHA claiming they need to complete an extra step to prove that they are human. Instead, the fake CAPTCHA instructs the user to copy and paste a PowerShell command into their Windows computer. They are a problem for computer users worldwide.