Full Report
A malicious package named 'pycord-self' on the Python package index (PyPI) targets Discord developers to steal authentication tokens and plant a backdoor for remote control over the system. [...]
Analysis Summary
# Tool/Technique: Malicious PyPI Package (Discord Token Stealer)
## Overview
This refers to the use of a seemingly legitimate package published on the Python Package Index (PyPI) repository that is, in fact, malicious code designed to steal Discord authentication tokens from developers who install it.
## Technical Details
- Type: Malware (specifically, a dependency confusion/typosquatting-style abuse of a package repository)
- Platform: Systems running Python/pip that access the PyPI repository, typically development environments (Windows, macOS, Linux).
- Capabilities: Installation leads to execution of code that searches for and exfiltrates Discord authentication tokens stored locally by the Discord application.
- First Seen: Not explicitly specified in the provided text, but associated with recent supply chain security concerns.
## MITRE ATT&CK Mapping
Based on the functionality described (installing a package that runs code to steal credentials):
- TA0008 - Credential Access
- T1555 - Credentials from Password Stores
- T1555.003 - Credentials from Web Browsers (While targeting Discord tokens, the mechanism involves accessing locally stored data, akin to how browser stealers operate).
- T1566 - Phishing
- T1566.005 - Phishing: Services (Abusing a trusted software repository like PyPI to trick developers)
## Functionality
### Core Capabilities
- **Supply Chain Compromise:** Leveraging the PyPI ecosystem to distribute malicious code disguised as a useful library.
- **Token Harvesting:** Searching local file systems for authentication tokens associated with the Discord chat application.
- **Exfiltration:** Sending the stolen tokens to an external command and control (C2) server.
### Advanced Features
- The malware relies on the developer installing the package via standard means (e.g., `pip install <package_name>`), utilizing the package's setup routines (like `setup.py` or equivalent initialization hooks) to execute the theft script automatically upon installation.
## Indicators of Compromise
(Note: Specific hashes, filenames, and network indicators were not present in the provided context, requiring placeholders based on threat type.)
- File Hashes: [Not specified]
- File Names: [Potentially the name of the malicious package/library, and any dropped scripts]
- Registry Keys: [Not specified]
- Network Indicators: [C2 servers/domains used for exfiltration - defanged] (e.g., `malicious-c2-domain[.]com`)
- Behavioral Indicators: Suspicious outbound network connections initiated during package installation or initialization, file system access targeting Discord token storage locations.
## Associated Threat Actors
- [Not specified in the provided context, but generally associated with commodity cybercriminals, credential harvesting operations, or groups targeting developer infrastructure.]
## Detection Methods
- **Signature-based detection:** Signatures targeting the specific malicious package name on PyPI or known hashes of the payload.
- **Behavioral detection:** Monitoring for Python processes (`python.exe` or `python3`) making outbound connections during dependency installation phases, especially if they attempt to read common user configuration or application data directories.
- **YARA rules:** Rules could be developed to detect specific strings or code artifacts within the package scripts related to Discord token file paths.
## Mitigation Strategies
- **Prevention measures:**
- Verify sources: Only install packages from trusted, well-established upstream repositories or internal, vetted artifact repositories.
- Review dependencies: Scrutinize the source code of new or less-known dependencies before installation in production or sensitive environments.
- Employ dependency scanning tools to check known vulnerabilities or malicious flags against packages.
- **Hardening recommendations:**
- Limit execution context: Run package installation tools (`pip`) with the least necessary privileges.
- Principle of Least Privilege for developers' machines to prevent widespread access upon compromise.
## Related Tools/Techniques
- Dependency Confusion Attacks
- Typosquatting in all major repositories (PyPI, npm, RubyGems)
- Credential Stealers targeting other applications (e.g., browser credential stealers, crypto wallet stealers).