Malicious code in embiggen (PyPI)
The package `embiggen` version 0.11.97 contains a malicious `.pth` file (`embiggen-setup.pth`) that executes a Bun-based credential stealer on every Python startup via CPython's `site.py` exec() mechanism. The payload downloads the Bun runtime from the official GitHub release page, then runs an obfuscated JavaScript stealer that exfiltrates environment variables, .env files, SSH keys, and cloud credentials to an attacker-controlled GitHub repository. This is part of the Hades/Miasma campaign (also called Shai-Hulud), attributed to the TeamPCP threat actor. Novel finding: `gpsea/_index.js` (same campaign) embeds CBRN-level dangerous-content text to trigger AI safety refusals in LLM-based security scanners, causing them to skip the file entirely. C2 IP: 20.207.73.82 Sentinel file: /tmp/.bun_ran MITRE ATT&CK: T1546.018 --- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (fde146ce352fe0581926c899cde5be769d4b7e0e04210bec5555889b4fe66636) The package was found to contain malicious code or consuming dependency that contains malicious code ## Source: kam193 (51ebfbf23c315702e5792c88fdc20449c798cebdbbdde4462cd98e3b7625618f) Versions 0.11.97 were compromised. Compromised packages start an obfuscated infostealer. The infostealer is a heavily obfuscated JavaScript code executed using Bun runtime on Python startup. It collectes all kinds of sensitive data, including API keys, credentials to package repositories, cryptocurrency assets, password manager data. Infostealer actively queries online services to collect additional secrets as well as attempts to gain persistence and spread further by publishing infected packages using collected credentials. Data are exfiltrated likely using Github. The code seems to threaten to wipe the user's data if it detects invalid GitHub tokens. Cleanup should be done with caution. It seems to be related to the recent Mini Shai Hulud campaign. --- Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers. Campaign: 2026-06-compr-woodpecker Reasons (based on the campaign): - compromised-package - exfiltration-env-variables - exfiltration-cloud-tokens - exfiltration-credentials - abuses-pth - obfuscation - infostealer - The package contains code to detect if it is running in a sandbox environment. - exfiltration-crypto - files-exfiltration - destructive-actions
AI Analysis
Technical Summary
The 'embiggen' PyPI package version 0.11.97 includes a malicious '.pth' file ('embiggen-setup.pth') that leverages CPython's site.py exec() mechanism to run a Bun runtime-based JavaScript infostealer on every Python startup. This infostealer downloads the Bun runtime from GitHub, executes heavily obfuscated JavaScript that collects environment variables, .env files, SSH keys, cloud credentials, cryptocurrency assets, and password manager data, then exfiltrates this information to an attacker-controlled GitHub repository. The campaign, attributed to the TeamPCP threat actor and known as Hades/Miasma or Shai-Hulud, also includes sandbox detection and destructive payloads triggered by invalid GitHub tokens. The malicious code attempts persistence and propagation by publishing infected packages using stolen credentials. The threat is part of a broader malicious campaign involving obfuscation and evasion techniques.
Potential Impact
This malicious package compromises the confidentiality of sensitive data including environment variables, cloud tokens, SSH keys, cryptocurrency assets, and password manager data by exfiltrating them to an attacker-controlled repository. It also threatens data integrity and availability by potentially wiping user data if invalid GitHub tokens are detected. The attacker gains persistence and propagation capabilities by publishing infected packages using stolen credentials, increasing the risk of further infections and supply chain compromise.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix or removal from PyPI is confirmed, users should immediately uninstall version 0.11.97 of the 'embiggen' package and avoid using it. Review and rotate any potentially exposed credentials, environment variables, and keys. Monitor for the sentinel file '/tmp/.bun_ran' as an indicator of compromise. Exercise caution during cleanup due to potential destructive payloads. Consider using trusted package sources and verifying package integrity before installation.
Malicious code in embiggen (PyPI)
Description
The package `embiggen` version 0.11.97 contains a malicious `.pth` file (`embiggen-setup.pth`) that executes a Bun-based credential stealer on every Python startup via CPython's `site.py` exec() mechanism. The payload downloads the Bun runtime from the official GitHub release page, then runs an obfuscated JavaScript stealer that exfiltrates environment variables, .env files, SSH keys, and cloud credentials to an attacker-controlled GitHub repository. This is part of the Hades/Miasma campaign (also called Shai-Hulud), attributed to the TeamPCP threat actor. Novel finding: `gpsea/_index.js` (same campaign) embeds CBRN-level dangerous-content text to trigger AI safety refusals in LLM-based security scanners, causing them to skip the file entirely. C2 IP: 20.207.73.82 Sentinel file: /tmp/.bun_ran MITRE ATT&CK: T1546.018 --- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (fde146ce352fe0581926c899cde5be769d4b7e0e04210bec5555889b4fe66636) The package was found to contain malicious code or consuming dependency that contains malicious code ## Source: kam193 (51ebfbf23c315702e5792c88fdc20449c798cebdbbdde4462cd98e3b7625618f) Versions 0.11.97 were compromised. Compromised packages start an obfuscated infostealer. The infostealer is a heavily obfuscated JavaScript code executed using Bun runtime on Python startup. It collectes all kinds of sensitive data, including API keys, credentials to package repositories, cryptocurrency assets, password manager data. Infostealer actively queries online services to collect additional secrets as well as attempts to gain persistence and spread further by publishing infected packages using collected credentials. Data are exfiltrated likely using Github. The code seems to threaten to wipe the user's data if it detects invalid GitHub tokens. Cleanup should be done with caution. It seems to be related to the recent Mini Shai Hulud campaign. --- Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers. Campaign: 2026-06-compr-woodpecker Reasons (based on the campaign): - compromised-package - exfiltration-env-variables - exfiltration-cloud-tokens - exfiltration-credentials - abuses-pth - obfuscation - infostealer - The package contains code to detect if it is running in a sandbox environment. - exfiltration-crypto - files-exfiltration - destructive-actions
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The 'embiggen' PyPI package version 0.11.97 includes a malicious '.pth' file ('embiggen-setup.pth') that leverages CPython's site.py exec() mechanism to run a Bun runtime-based JavaScript infostealer on every Python startup. This infostealer downloads the Bun runtime from GitHub, executes heavily obfuscated JavaScript that collects environment variables, .env files, SSH keys, cloud credentials, cryptocurrency assets, and password manager data, then exfiltrates this information to an attacker-controlled GitHub repository. The campaign, attributed to the TeamPCP threat actor and known as Hades/Miasma or Shai-Hulud, also includes sandbox detection and destructive payloads triggered by invalid GitHub tokens. The malicious code attempts persistence and propagation by publishing infected packages using stolen credentials. The threat is part of a broader malicious campaign involving obfuscation and evasion techniques.
Potential Impact
This malicious package compromises the confidentiality of sensitive data including environment variables, cloud tokens, SSH keys, cryptocurrency assets, and password manager data by exfiltrating them to an attacker-controlled repository. It also threatens data integrity and availability by potentially wiping user data if invalid GitHub tokens are detected. The attacker gains persistence and propagation capabilities by publishing infected packages using stolen credentials, increasing the risk of further infections and supply chain compromise.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix or removal from PyPI is confirmed, users should immediately uninstall version 0.11.97 of the 'embiggen' package and avoid using it. Review and rotate any potentially exposed credentials, environment variables, and keys. Monitor for the sentinel file '/tmp/.bun_ran' as an indicator of compromise. Exercise caution during cleanup due to potential destructive payloads. Consider using trusted package sources and verifying package integrity before installation.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- MAL-2026-5314
- Osv Schema Version
- 1.7.4
- Aliases
- []
- Ecosystems
- ["PyPI"]
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a50ba4568715ace4357e5e2
Added to database: 07/10/2026, 09:24:21 UTC
Last enriched: 07/10/2026, 09:37:14 UTC
Last updated: 07/31/2026, 12:27:30 UTC
Views: 13
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