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Beware of this sneaky Google attack that steals expired cookies

Beware of this sneaky Google attack that steals expired cookies


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New York City drivers face a $15 daily congestion fee when they enter a paid congestion zone south of 60th Street monitored by license plate readers. Kurt “CyberGuy” Knutsson explains the details.

A new exploit threat allows hackers to gain access to Google accounts using expired cookies containing login information. The exploit, discovered late last year, targets session cookies that have a limited lifetime. However, it is possible to “revive” those cookies and put your personal information at risk.

A hacker named PRISMA was the first to reveal that he had discovered a way to undo expired Google session cookies. Cybersecurity firm CloudSEK has since discovered an exploit for the program that allows users to sync their Google accounts across multiple devices. Hackers are currently using the exploit to steal login information and other information. Here we detail how it all unfolded and how you can protect yourself.

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Google's multi-login abuse

As reported by BleepingComputer, a particular strain of malware has discovered a backdoor into Google's authentication system. This vulnerability is in his MultiLogin endpoint, but it is undocumented and little known to the public. This secret gateway allows an attacker to revive expired authentication cookies and gain unauthorized access to a user's girlfriend Google account.

Google Chrome Startup Page (Kurt “CyberGuy” Knutsson)

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Role of session cookies

Before we go into more detail, let's understand the role of session cookies. These special browser cookies contain authentication information. If you've ever experienced the convenience of being able to return to a site without having to re-enter your credentials, you've likely encountered session cookies. However, it is designed to intentionally limit its lifetime to prevent unauthorized access over long periods of time.

Read more: How Google's data can make you a suspect in a crime you didn't commit

The relationship between Rumma and Rhadamanthys

Last November, cybercriminals associated with information-stealing malware Lumma and Rhadamanthys made bold claims that they could revive expired Google authentication cookies stolen during cyberattacks. Taking advantage of these seemingly obsolete cookies, hackers can break into a victim's Google account even if the user is logged out, reset their password, or has an expired session. To do.

PRISMA revelation

The exploit dates back to a Telegram post by a threat actor known as PRISMA. In October they announced the discovery of a way to restore expired Google authentication cookies. This revelation set the stage for further investigation.

Investigating CloudSEK

Introducing CloudSEK, a cybersecurity company dedicated to predicting and preventing cyberattacks. These researchers took on the challenge of reverse engineering the exploit. Their findings revealed that MultiLogin endpoints have become a lynchpin for hackers. This undocumented feature makes it easy to synchronize accounts across different Google services, making it an ideal target for malicious actors to exploit.

Google Chrome Startup Page (Kurt “CyberGuy” Knutsson)

Read more: Google finally admits data collection in Chrome's incognito mode

Protection from multi-login exploits

MultiLogin abuse raises serious concerns for Google account holders. To protect yourself from this threat, consider the following steps:

1) Sign out of the affected browser. Google is aware of this issue and is taking steps to protect compromised accounts. Google recommends disabling session cookies by signing out of affected browsers.

2) Enhanced Safe Browsing: Enable Enhanced Safe Browsing in Chrome to increase protection against malware and phishing attacks.

On the computer:

Open Google Chrome on your computer Click your initials in the top-right corner of your browser window Tap Manage your Google Account Click Security on the left side Under Enhanced Safe Browsing for your account Make sure it's turned on

On your smartphone:

Open Google Chrome on your computer Click your initials in the top-right corner of your browser window Tap your Google Account Click Security Scroll down and make sure Enhanced Safe Browsing is turned on for your account confirm

3) Change your password regularly: Change your Google password regularly to protect your account from hackers. If you're having trouble creating new passwords, consider using a password manager.

4) Install good antivirus software on all your devices: The best way to protect yourself from a data breach is to install antivirus on all your devices. Choose the best option for your PC, Mac, iPhone, or Android smartphone. Having good antivirus software actively running on your device will warn you about malware in your system, warn you against clicking on malicious links in phishing emails, and ultimately protect you from hacking. Check out my picks for the best antivirus protection products of 2024 for your Windows, Mac, Android, and iOS devices.

Cart important points

In light of recent exploits targeting Google accounts via revived session cookies, it is essential to strengthen your defenses against such cyber threats. From initial discovery by PRISMA to subsequent investigation by CloudSEK, vulnerabilities in Google's MultiLogin endpoint were revealed.

To protect your account, sign out of affected browsers, enable Enhanced Safe Browsing, update your passwords regularly, and install appropriate antivirus software on all your devices. By implementing these security measures, you can thwart attempts to violate your online privacy and protect your digital identity.

How important do you think it is for a technology company like Google to continually update and strengthen its security protocols to protect users from evolving cyber threats? Email Please let us know.

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Kurt “CyberGuy” Knutsson is an award-winning technology journalist who loves technology, gear, and gadgets, writes for Fox News and FOX Business on FOX & Friends in the morning, and shares stories about making lives better. I am. Have a technical question? Get the Kurts CyberGuy Newsletter and share your voice, story ideas, and comments on




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