Token Grabber: Unmasking a Discord-based Malware Stealer

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In recent months, cybersecurity researchers have observed an uptick in malware threats targeting Discord channels and webhooks for data exfiltration purposes. One such menace that has garnered significant attention is Token Grabber, a Python-developed stealer designed to pilfer sensitive credentials from unsuspecting users.

This article delves into the inner workings of Hazard Stealer, also known as Token Grabber, exploring its key features, functionality, and distribution mechanisms through popular platforms like GitHub. By understanding this malware's modus operandi, organizations can bolster their defenses against such threats and protect valuable assets.

Overview

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Hazard Stealer is a Python-based stealer that utilizes Discord webhooks to exfiltrate pilfered data. Upon successful execution, the malware terminates specified processes and injects itself into legitimate system services for persistence. This stealthy behavior makes it challenging for traditional antivirus solutions to detect and remove.

Configuration Settings

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The malware's configuration file contains several variables that can be modified by threat actors (TAs) to customize its functionality:

1. Flag Variables: These flags determine which data sets the stealer will target during exfiltration.

2. List of Programs to Terminate: A list of processes that will be terminated upon execution, effectively evading detection.

Payload Analysis

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Upon analysis of a recent sample (Figure 3), researchers discovered several interesting details:

1. The malware was compiled using Pyinstaller for obfuscation and self-persistence.

2. It utilizes Python version 3.10 as its base language.

3. The builder used to generate the payload is a simple batch file.

Distribution Mechanisms

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Token Grabber's spread can be attributed largely to its presence on popular repositories like GitHub, where threat actors (TAs) upload malicious code for easy access by potential victims. Figure 2 illustrates an upward trend in sample submissions related to Hazard Stealer on VirusTotal over the last three months.

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In conclusion, Token Graber represents a formidable example of evolving malware threats that TAs are leveraging to exfiltrate sensitive data from unsuspecting users. By understanding its distribution mechanisms and functionality, organizations can bolster their defenses against such threats and protect valuable assets.

Recommendations for Organizations:

1. Regularly update your systems with the latest security patches.

2. Implement robust access controls and monitoring on Discord channels and webhooks.

3. Educate employees about recognizing and reporting suspicious activity.

4. Consider implementing endpoint protection solutions that can detect and remove stealthy threats like Hazard Stealer.

By following these recommendations, organizations can significantly reduce their risk exposure to sophisticated malware attacks like Token Graber and safeguard valuable assets from falling into the wrong hands.

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