$10K phishing kit claims it can plant rogue passkeys for persistent access to pwned accounts

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$10K phishing kit claims it can plant rogue passkeys for persistent access to pwned accounts

Seller's demos show a browser-in-the-middle attack adding credentials seconds after authentication

Connor Jones

Connor<br>Jones

Cybersecurity reporter

Published<br>fri 21 Aug 2026 // 13:18 UTC

A phishing kit for sale on Russian-language cybercrime forums claims it can enroll attacker-controlled passkeys on compromised accounts, providing persistent access after passwords are changed.<br>Advertised at around $10,000 for the base package, with additional modules sold separately, iAuthFlow v2 aims to solve a common problem for attackers: being locked out after the victim detects the compromise.<br>Defenders would ordinarily revoke session tokens and rotate credentials. Those measures remain necessary, but may not be sufficient if the attacker has enrolled a passkey on the compromised account.

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According to Abnormal Security, which examined the kit's documentation and demonstration videos, the technique uses a browser-in-the-middle (BitM) model involving two separate browser environments.

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In a BitM attack, the victim appears to complete the login on their own device, while the attacker's infrastructure relays the interaction through a separate browser session.<br>The victim sees a phishing page impersonating the targeted service. The iAuthFlow v2 demos focused on Google, but the seller advertises packages for iCloud, LinkedIn, and Microsoft too.<br>The victim enters their account details into the phishing page, while iAuthFlow v2 operates a separate browser on the attacker's server. It sends the victim's input to Google and relays Google's prompts back to the victim. The process repeats until the authentication flow is complete.<br>Once authentication is complete, iAuthFlow v2 controls an authenticated browser session and uses it to enroll an attacker-controlled passkey, Abnormal says. That credential can remain valid after the victim changes their password.<br>Rather than sending the victim to their Gmail inbox after authentication, iAuthFlow v2 displays a brief loading screen reading: "Verification, Processing." Meanwhile, the toolkit works behind the scenes to register a passkey to an attacker-controlled device.<br>"During that pause, the seller's demonstration shows the passkey module opening the target's Google passkey settings through the authenticated browser and requesting a new credential," Abnormal said.<br>"Google may require further identity verification before allowing the change. In the recorded run, the toolkit log indicates that the passkey was created six seconds after authentication."<br>It is unclear where the private key associated with the attacker's passkey is stored. Abnormal hypothesized that the kit may use a Chromium-based virtual authenticator capable of completing WebAuthn registration without storing the private key on the victim's device.

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However, because the researchers did not buy and test the kit, they could not confirm its storage mechanism – or independently verify the seller's broader claims.<br>Whatever the storage mechanism, organizations should look for newly registered passkeys when investigating an account compromise.

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Responders should also hunt for other post-compromise changes, including rogue passkeys, OAuth grants, recovery methods, Gmail filters, and forwarding rules.<br>"Response and recovery cannot end with a password reset or session revocation," said Abnormal. "Organizations must also examine what changed after authentication – especially newly enrolled credentials, recovery methods, OAuth grants, and mailbox settings – and remove anything the attacker left behind.<br>"As toolkits like iAuthFlow v2 expand their post-authentication capabilities, effective response increasingly depends on treating account restoration as a comprehensive investigation, not a simple reset."<br>Passkeys are routinely heralded as the future of account security. Designed to resist phishing, they can replace passwords and more vulnerable forms of MFA.<br>Registering a passkey does not make an account bulletproof. Attackers can instead target fallback login methods, active sessions, account recovery processes, and other weaknesses surrounding the credential.<br>Stealing session cookies, often through infostealer malware, can grant access to an authenticated session without triggering a passkey prompt.

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Another route is device code phishing, although it depends on the organization permitting the underlying OAuth device flow – something generally discouraged unless operationally necessary....