Python-Based XillenStealer — Deep Threat Analysis & Defense Playbook By CyberDudeBivash — Founder: Bivash Kumar Nayak
Published: September 17, 2025 Sites: cyberdudebivash.com | cyberbivash.blogspot.com | cryptobivash.code.blog Hashtags: #CyberDudeBivash #XillenStealer #Infostealer #ThreatIntel #Cybersecurity TL;DR (Executive Summary) XillenStealer is a Python-based information-stealer that surfaced publicly on GitHub and quickly attracted malicious reuse due to its integrated builder and Telegram-based exfiltration options. The stealer harvests browser credentials, cookies, crypto wallet files, and system metadata, and packages exfiltrated data for delivery to attacker-controlled Telegram bots or HTTP(S) endpoints. Because the project offers a builder producing frozen/bundled payloads, it lowers the bar for low-skill operators and has a high potential for rapid mass abuse. High-impact mitigations include blocking untrusted Python execution in user contexts (AppLocker/WDAC), egress controls for api.telegram.org , stricter credential hygiene for crypto users, and enhanced EDR rules for Py...