New Rust-based Fickle Malware: Uncovering the Advanced Techniques for UAC Bypass and Data Theft

Introducing Fickle Stealer: The New Rust-based Information Stealer Malware

A new player has entered the cybercrime arena: Fickle Stealer, a Rust-based information stealer malware, is making waves with its sophisticated delivery mechanisms and data theft capabilities. According to Fortinet FortiGuard Labs, this malware has been observed making its way into compromised hosts through various attack chains.

Four Different Distribution Methods

FortiGuard Labs have identified four distinct distribution methods employed by Fickle Stealer. The first method involves a VBA dropper, a sneaky tactic that leverages visual basic for applications to drop the malicious payload onto the victim’s system. The second method, VBA downloader, follows a similar trajectory but focuses on downloading additional components to further the malware’s agenda.

Link and Executable Downloaders

The third distribution method uses a link downloader, compelling victims to click on a malicious link that initiates the download of the malware. The fourth method, an executable downloader, involves tricking users into executing a malicious file, thereby paving the way for Fickle Stealer to infiltrate the system and start its data-harvesting activities.

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Unraveling the Modus Operandi

Upon successfully infiltrating a host, Fickle Stealer sets its sights on sensitive information, aiming to extract valuable data from the compromised system. Whether it’s personal details, financial information, or credentials, this malware leaves no stone unturned in its quest for data theft.

A Stealthy Threat

What sets Fickle Stealer apart is its stealthy nature. By utilizing Rust, a programming language known for its performance and security features, the malware can operate undetected for extended periods, evading traditional security measures and posing a significant threat to organizations and individuals alike.

Protecting Against Fickle Stealer

Given the evolving threat landscape and the emergence of sophisticated malware like Fickle Stealer, it’s crucial for individuals and organizations to bolster their cybersecurity defenses. Implementing robust security protocols, conducting regular security audits, and leveraging advanced threat detection mechanisms are essential steps in fortifying your digital defenses against such insidious threats.


In the ever-changing landscape of cybersecurity threats, the rise of Fickle Stealer serves as a stark reminder of the persistent efforts by cybercriminals to compromise systems and steal sensitive information. By staying informed, adopting best practices, and remaining vigilant, individuals and organizations can navigate these treacherous waters and safeguard themselves against the looming threat of malware attacks.

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