HBO Max Reddit Account Hijacked for ClickFix Malware Ads

Help Net Security · High sophistication
Last updated September 15, 2026

Attackers took over the verified official HBO Max Reddit account and used it to run a 48-hour wave of malicious ads. The ads sent people to lookalike download sites that tricked them into copying and running commands, leading to information-stealing malware on both macOS and Windows. Researchers say the attackers rapidly rotated domains and selectively showed malicious content to avoid detection.

Key findings

  • Attackers compromised the verified official HBO Max Reddit account (u/hbomax) and abused its trusted status to run malicious ads.
  • The campaign used ClickFix: victims were instructed to copy/paste and run commands that installed information-stealing malware.
  • Over 48 hours, the compromised account ran 108 distinct ads and rapidly switched domains when previous ones were blocked.
  • Lures included fake HBO Max macOS app downloads, fake OpenAI Codex tools, and fake Apple/macOS utility pages.
  • The operation tailored payloads by platform: macOS used curl piped to zsh; Windows used mshta and PowerShell leading to in-memory execution.
  • The broader operation (“PasteSwitch”) also included fake wallet apps and cryptocurrency clippers, with some control data stored via Binance Smart Chain smart contracts.
  • Attackers used visitor checks (browser/screen/device signals) so some visitors saw benign content or redirects, making detection harder.

Who’s being targeted

  • Commonly targeted roles: All employees, Executives, Developers/Engineering, IT/Helpdesk, Finance (crypto/wallet risk awareness).
  • Affected industries: Media & Entertainment, Online advertising platforms / social media, Consumers (end users), Software/Developer tools users, Cryptocurrency users.
  • Attack channels: website.
  • Impersonated: HBO Max (verified Reddit advertiser/account), OpenAI Codex.

Awareness takeaways

  • Treat ads and “verified” accounts as untrusted sources, verify software downloads through official vendor channels you already know.
  • Never copy/paste and run Terminal/PowerShell commands from a website to “fix” or “install” something, stop and ask IT/security to review.
  • Watch for lookalike domains and unexpected download prompts (e.g., hbomaxx[.]us) even when the brand name looks right.
  • Assume attackers may show different content to different people; report suspicious pages even if security tools or colleagues can’t reproduce it.

Red flags to watch for

  • A well-known service offering an unexpected 'app download' via an ad rather than an official app store/vendor site
  • Instructions to copy/paste and run a command in Terminal/PowerShell to install software
  • Lookalike domains (e.g., hbomaxx[.]us) and rapid domain switching
  • Tool downloads coming from unfamiliar domains (not the vendor’s known domain)
  • Any workflow that requires running pasted commands from a website
  • Ads or sponsored posts being treated as inherently trustworthy
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Read the video transcript

You’re scrolling Reddit, see an ad from the verified u/hbomax account, and think, “Cool, an HBO Max macOS app.” But that HBO Max account was hijacked. The ad sends you to hbomaxx.us, a lookalike site that tells you: copy this command into Terminal or PowerShell to download the app. That’s ClickFix: you paste the command, it quietly installs info‑stealing malware. On macOS it’s curl piped to zsh; on Windows it’s mshta and PowerShell, all triggered by you. If any site, HBO Max, OpenAI, whatever, tells you to paste a command to install or fix something, stop. Don’t run it. Screenshot it and send it to IT or Security.

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