Brinztech Alert: New “CHAOS” Crypter Sales Detected: Advanced Evasion Tool Bypasses Major EDRs

Dark Web News Analysis

A threat actor on a known cybercrime forum is actively advertising the sale of a sophisticated new crypter tool named “CHAOS Crypter.” This tool is marketed as a premium solution for cybercriminals, designed to cloak malicious payloads (malware) to evade detection by modern security products.

Brinztech Analysis:

• The Selling Point (FUD): The core value proposition of CHAOS is its ability to make malware “Fully Undetectable” (FUD). It explicitly claims to bypass top-tier Endpoint Detection and Response (EDR) solutions, including CrowdStrike and SentinelOne, as well as Microsoft’s AMSI (Antimalware Scan Interface) and ETW (Event Tracing for Windows).
• Technical Sophistication: The tool utilizes polymorphic code generation, meaning the file structure changes with every build, rendering traditional signature-based antivirus useless. It supports .NET and C/C++ payloads, making it compatible with the most common ransomware and infostealer families.
• Automation & Accessibility: CHAOS is not just a standalone tool; it offers a Web-based platform and a REST API. This allows sophisticated threat actors to integrate the crypter directly into their automated malware build pipelines, enabling mass-scale campaigns that constantly mutate to stay ahead of defenders.

Key Cybersecurity Insights

This tool represents a significant escalation in the Malware-as-a-Service (MaaS) ecosystem:

• Evasion Capabilities: By targeting AMSI and ETW, CHAOS aims to blind the specific telemetry feeds that security analysts rely on to detect “fileless” or script-based attacks.
• Lower Barrier to Entry: The subscription model (Pro/Elite tiers) and user-friendly web interface democratize advanced evasion techniques. Low-skill attackers can now deploy malware with nation-state level stealth capabilities.
• Persistence: The tool includes varied injection methods (e.g., Process Hollowing, APC Injection) to ensure malware remains active and hidden within legitimate system processes.

Mitigation Strategies

In response to this new evasion tool, organizations must shift from signature-based to behavior-based defense:

• Enhanced Endpoint Detection (Behavioral Analysis): Signature scanning will fail against CHAOS. Ensure your EDR is configured to block behavioral anomalies, such as a legitimate process (like calc.exe or notepad.exe) attempting to make network connections or inject code into other processes.
• Application Control: Implement strict Application Whitelisting (e.g., AppLocker or WDAC). Prevent any unsigned or unknown executable from running in user directories (%AppData%, %Temp%), regardless of whether the antivirus flags it.
• Disable Scripting Engines: If not needed, disable PowerShell and WScript on standard user workstations to reduce the attack surface that crypters often exploit for initial staging.
• Threat Hunting: Proactively hunt for signs of AMSI bypass attempts or disabled event logging (ETW), as these are often the precursor to the CHAOS payload execution.

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