Breaking Down the Exploitation of Google Chrome Zero-Day CVE-2025-2783 by TaxOff for Trinper Backdoor Deployment
exploitation to its Project Zero research team.
In a surprising turn of events, the Advanced Threat Research Unit of Positive Technologies observed an unusual spike in vulnerability exploits, leading them to discover that an unknown attacker had been using Google Chrome zero-day CVE-2025-2783 as a launching point for sophisticated attacks.
This zero-day was used to deploy a backdoor known as Trinper, which is believed to be in control of a threat actor known as TaxOff.
The security flaw, commonly referred to as a sandbox escape vulnerability, was quietly patched by Google in late March, following a diligent report from the Kaspersky team who had noticed alarming in-the-wild exploitations.
The notably high CVSS score of 8.3 indicates the extent to which this vulnerability could be exploited, which includes attempted breaches of data integrity, confidentiality, and system availability.
An In-Depth Look at the Exploit
The CVE-2025-2783 is a sandbox escape vulnerability.
In essence, it’s a flaw that allows an attacker to escape the limitations imposed by a software sandbox — a secure, isolated environment where untrusted programs can be safely run.
This escape allows the attacker to interact with other parts of the user’s system, leading to a wider system compromise.
TaxOff, a previously unknown threat actor, exploited this vulnerability to stealthily install the Trinper backdoor.
The backdoor granted TaxOff complete control over the compromised system.
As a result, TaxOff could exfiltrate sensitive information, upload and execute malicious files, and even collect browsing data.
This is a perfect example of how a seemingly small software flaw can potentially lead to serious security breaches.
Preventive Measures and User Defense
Upon discovery of the exploit, Google took immediate action to mitigate the threat.
A patch was issued in late March 2025, which fixes this vulnerability.
We recommend users to keep their Google Chrome browser updated to the latest version to ensure that they are protected from this flaw.
Your first line of defense should always be running the latest software versions, including antivirus programs.
It is also prudent to regularly back up important data and refrain from visiting untrusted websites or downloading software from unverified sources.
Keep in mind that no security measure is foolproof.
Therefore, maintaining a rigorous cybersecurity posture is essential for minimizing potential threats.
