HellsUchecker is a sophisticated native x64 backdoor, measuring 28 KB, known for its complex 10-stage attack chain that begins with a deceptive ClickFix lure, resembling a Cloudflare CAPTCHA, and culminates in a memory-resident payload that communicates with its command and control (C2) server over HTTPS. The initial stage directs victims to a phishing page, http://h01-captcha.sbs, which replicates a legitimate CAPTCHA interface. Upon interaction, it prompts users to execute a malicious command line, facilitated by a clipboard payload that runs the legitimate Windows utility "finger.exe" on port 79. This utility fetches malicious commands hidden in a crafted .plan file from a malicious server. The payload then employs a series of instructions to disable the desktop's explorer.exe, download a legitimate Python embed package disguised as a PDF, and execute a secondary payload via a base64-encoded script.