MalwarePublished 8 Oct 2025

Shuyal Stealer: Advanced Infostealer Targeting 19 Browsers

Source AlienVault OTX General

Description

Shuyal Stealer is a sophisticated infostealer malware targeting 19 different browsers. It conducts deep system reconnaissance, collecting detailed hardware information and user data. The malware disables Windows Task Manager, ensures persistence through startup folder insertion, and exfiltrates stolen data via a Telegram bot. Shuyal's capabilities include credential harvesting from multiple browsers, clipboard capture, screenshot taking, and Discord token theft. It employs evasion techniques like self-deletion and uses PowerShell for data compression. The malware's wide-ranging browser targets and extensive data collection make it a significant threat to user privacy and system security.

Impact

For European organizations, Shuyal Stealer presents a considerable risk to confidentiality and integrity of sensitive information. The theft of browser-stored credentials can lead to unauthorized access to corporate accounts, internal systems, and cloud services, potentially enabling lateral movement and data breaches. Clipboard capture and screenshot capabilities increase the risk of leaking sensitive information such as passwords, financial data, or confidential documents. Discord token theft may expose internal communications or allow attackers to impersonate users in collaboration platforms. Disabling Task Manager and self-deletion hinder detection and remediation, prolonging attacker presence and increasing damage potential. The malware’s persistence mechanism ensures ongoing risk until fully eradicated. The use of Telegram for data exfiltration complicates network monitoring and blocking efforts, as Telegram traffic is often allowed in corporate environments. Organizations with remote or hybrid workforces using diverse browsers are particularly vulnerable. The broad browser targeting means that even users who do not use mainstream browsers may still be affected. Overall, the malware could facilitate espionage, financial fraud, and reputational damage, especially in sectors handling sensitive personal or business data.

Defensive guidance

European organizations should implement multi-layered defenses tailored to Shuyal Stealer’s capabilities. First, enforce strict application control policies to prevent unauthorized execution of PowerShell scripts and unknown binaries, especially those attempting to modify startup folders. Deploy endpoint detection and response (EDR) solutions with behavioral analytics to detect disabling of Task Manager and unusual process activities. Regularly audit and restrict access to stored browser credentials and encourage use of password managers with master passwords rather than browser storage. Monitor clipboard access and implement controls to limit sensitive data exposure. Network monitoring should include detection of unusual Telegram API traffic or connections to known malicious Telegram bots, with the possibility of blocking or alerting on such traffic. Conduct user awareness training focusing on phishing and social engineering, as initial infection vectors often rely on user interaction. Maintain up-to-date backups and incident response plans to quickly recover from infections. Employ browser hardening techniques and keep all browsers updated to reduce vulnerabilities. Finally, implement strict privilege management to limit malware’s ability to persist and evade detection.

Indicators of compromise

URLs 1

https://api.telegram.org/bot7522684505:AAEODeii83B_nlpLi0bUQTnOtVdjc8yHfjQ/sendDocument?chat_id=-1002503889864]

Hashes 2

9523086ab1c3ab505f3dfd170672af1e
8bbeafcc91a43936ae8a91de31795842cd93d2d8be3f72ce5c6ed27a08cdc092

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Description

AI analysisMachine-generated, updated 8 Oct 2025, 16:30 UTC

MITRE ATT&CK techniques18 from threat tags

Technical details

Indicators of compromise

URLs 1

Hashes 2

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