A brand new malware marketing campaign is distributing a novel Rust-based data stealer dubbed EDDIESTEALER utilizing the favored ClickFix social engineering tactic initiated through faux CAPTCHA verification pages.
“This marketing campaign leverages misleading CAPTCHA verification pages that trick customers into executing a malicious PowerShell script, which finally deploys the infostealer, harvesting delicate knowledge akin to credentials, browser data, and cryptocurrency pockets particulars,” Elastic Safety Labs researcher Jia Yu Chan stated in an evaluation.
The assault chains start with menace actors compromising reliable web sites with malicious JavaScript payloads that serve bogus CAPTCHA examine pages, which immediate website guests to “show you aren’t [a] robotic” by following a three-step course of, a prevalent tactic known as ClickFix.
This entails instructing the potential sufferer to open the Home windows Run dialog immediate, paste an already copied command into the “verification window” (i.e., the Run dialog), and press enter. This successfully causes the obfuscated PowerShell command to be executed, ensuing within the retrieval of a next-stage payload from an exterior server (“llll[.]match”).
The JavaScript payload (“gverify.js”) is subsequently saved to the sufferer’s Downloads folder and executed utilizing cscript in a hidden window. The principle purpose of the intermediate script is to fetch the EDDIESTEALER binary from the identical distant server and retailer it within the Downloads folder with a pseudorandom 12-character file title.
Written in Rust, EDDIESTEALER is a commodity stealer malware that may collect system metadata, obtain duties from a command-and-control (C2) server, and siphon knowledge of curiosity from the contaminated host. The exfiltration targets embrace cryptocurrency wallets, net browsers, password managers, FTP shoppers, and messaging apps.
“These targets are topic to alter as they’re configurable by the C2 operator,” Elastic defined. “EDDIESTEALER then reads the focused information utilizing customary kernel32.dll capabilities like CreateFileW, GetFileSizeEx, ReadFile, and CloseHandle.”
The collected host data is encrypted and transmitted to the C2 server in a separate HTTP POST request after the completion of every activity.
In addition to incorporating string encryption, the malware employs a customized WinAPI lookup mechanism for resolving API calls and creates a mutex to make sure that just one model is operating at any given time. It additionally incorporates checks to find out if it is being executed in a sandboxed atmosphere, and in that case, deletes itself from disk.
“Primarily based on an analogous self-deletion approach noticed in Latrodectus, EDDIESTEALER is able to deleting itself by NTFS Alternate Knowledge Streams renaming, to bypass file locks,” Elastic famous.
One other noteworthy function constructed into the stealer is its potential to bypass Chromium’s app-bound encryption to realize entry to unencrypted delicate knowledge, akin to cookies. That is completed by together with a Rust implementation of ChromeKatz, an open-source instrument that may dump cookies and credentials from the reminiscence of Chromium-based browsers.
The Rust model of ChromeKatz additionally incorporates modifications to deal with eventualities the place the focused Chromium browser is just not operating. In such circumstances, it spawns a brand new browser occasion utilizing the command-line arguments “–window-position=-3000,-3000 https://google.com,” successfully positioning the brand new window far off-screen and making its invisible to the consumer.
In opening the browser, the goal is to allow the malware to learn the reminiscence related to the community service youngster course of of Chrome that is recognized by the “-utility-sub-type=community.mojom.NetworkService” flag and finally extract the credentials.
Elastic stated it additionally recognized up to date variations of the malware with options to reap operating processes, GPU data, variety of CPU cores, CPU title, and CPU vendor. As well as, the brand new variants tweak the C2 communication sample by preemptively sending the host data to the server earlier than receiving the duty configuration.
That is not all. The encryption key used for client-to-server communication is hard-coded into the binary, versus retrieving it dynamically from the server. Moreover, the stealer has been discovered to launch a brand new Chrome course of with the –remote-debugging-port=
“This adoption of Rust in malware improvement displays a rising pattern amongst menace actors in search of to leverage fashionable language options for enhanced stealth, stability, and resilience towards conventional evaluation workflows and menace detection engines,” the corporate stated.
The disclosure comes as c/facet revealed particulars of a ClickFix marketing campaign that targets a number of platforms, akin to Apple macOS, Android, and iOS, utilizing methods like browser-based redirections, faux UI prompts, and drive-by obtain methods.
The assault chain begins with an obfuscated JavaScript hosted on an internet site, that when visited from macOS, initiates a collection of redirections to a web page that guides victims to launch Terminal and run a shell script, which ends up in the obtain of a stealer malware that has been flagged on VirusTotal because the Atomic macOS Stealer (AMOS).
Nonetheless, the identical marketing campaign has been configured to provoke a drive-by obtain scheme when visiting the net web page from an Android, iOS, or Home windows system, resulting in the deployment of one other trojan malware.
The disclosures coincide with the emergence of latest stealer malware households like Katz Stealer and AppleProcessHub Stealer concentrating on Home windows and macOS respectively, and are able to harvesting a variety of knowledge from contaminated hosts, in keeping with Nextron and Kandji.
Katz Stealer, like EDDIESTEALER, is engineered to bypass Chrome’s app-bound encryption, however differently by using DLL injection to acquire the encryption key with out administrator privileges and use it to decrypt encrypted cookies and passwords from Chromium-based browsers.
“Attackers conceal malicious JavaScript in gzip information, which, when opened, set off the obtain of a PowerShell script,” Nextron stated. “This script retrieves a .NET-based loader payload, which injects the stealer right into a reliable course of. As soon as energetic, it exfiltrates stolen knowledge to the command and management server.”
AppleProcessHub Stealer, then again, is designed to exfiltrate consumer information together with bash historical past, zsh historical past, GitHub configurations, SSH data, and iCloud Keychain.
Assault sequences distributing the malware entail using a Mach-O binary that downloads a second-stage bash stealer script from the server “appleprocesshub[.]com” and runs it, the outcomes of that are then exfiltrated again to the C2 server. Particulars of the malware have been first shared by the MalwareHunterTeam on Might 15, 2025, and by MacPaw’s Moonlock Lab final week.
“That is an instance of a Mach-O written in Goal-C which communicates with a command and management server to execute scripts,” Kandji researcher Christopher Lopez stated.
