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Elastic Security Labs has identified a new information stealer called EDDIESTEALER, a Rust-based malware distributed through fake CAPTCHA campaigns. These campaigns trick users into executing malicious PowerShell scripts, which then deploy the infostealer onto their systems. EDDIESTEALER is hosted on multiple adversary-controlled web properties and employs the ClickFix social engineering tactic, luring unsuspecting individuals with the promise of CAPTCHA verification. The malware aims to harvest sensitive data, including credentials, browser information, and cryptocurrency wallet details.

This attack chain begins with threat actors compromising legitimate websites, injecting malicious JavaScript payloads that present bogus CAPTCHA check pages. Users are instructed to copy and paste a PowerShell command into their Windows terminal as verification, which retrieves and executes a JavaScript file called gverify.js. This script, in turn, fetches the EDDIESTEALER binary from a remote server, saving it in the downloads folder with a pseudorandom filename. The malware dynamically retrieves configuration data from a command-and-control server, allowing it to adapt its behavior and target specific programs.

EDDIESTEALER is designed to gather system metadata and siphon data of interest from infected hosts, including cryptocurrency wallets, web browsers, password managers, FTP clients, and messaging apps like Telegram. The malware incorporates string encryption, a custom WinAPI lookup mechanism, and a mutex to prevent multiple instances from running. It also includes anti-sandbox checks and a self-deletion technique using NTFS Alternate Data Streams to evade detection. The dynamic C2 tasking gives attackers flexibility, highlighting the ongoing threat of ClickFix campaigns and the increasing use of Rust in malware development.

ImgSrc: securityonline.

References :

• Virus Bulletin: Elastic Security Labs has uncovered a novel Rust-based infostealer distributed via Fake CAPTCHA campaigns that trick users into executing a malicious PowerShell script. EDDIESTEALER is hosted on multiple adversary-controlled web properties.
• The Hacker News: New EDDIESTEALER Malware Bypasses Chrome's App-Bound Encryption to Steal Browser Data
• www.scworld.com: ClickFix used to spread novel Rust-based infostealer
• Anonymous ???????? :af:: “Prove you're not a robot†— turns into full system breach! Hackers are using fake CAPTCHA checks to deploy a stealthy new Rust malware, EDDIESTEALER, via ClickFix—a social engineering trick abusing PowerShell on Windows , ,
• securityonline.info: EDDIESTEALER: New Rust Infostealer Uses Fake CAPTCHAs to Hijack Crypto Wallets & Data
• malware.news: Cybersecurity researchers have identified a sophisticated malware campaign utilizing deceptive CAPTCHA interfaces to distribute EddieStealer, a Rust-based information stealing malware that targets sensitive user data across multiple platforms.
• cyberpress.org: ClickFix Technique Used by Threat Actors to Spread EddieStealer Malware
• gbhackers.com: Threat Actors Leverage ClickFix Technique to Deploy EddieStealer Malware

Classification:

• HashTags: #EDDIESTEALER #InfoStealer #FakeCAPTCHA
• Company: Elastic
• Target: Users
• Product: Elastic Security Labs
• Feature: data theft
• Malware: EDDIESTEALER
• Type: Malware
• Severity: Medium