Malicious code in xzbails (npm)
The xzbails npm package, versions 0.0.3, 0.0.4, and 0.0.5, is part of a large family of malicious forks of the Baileys WhatsApp Web library. These forks inject code that silently subscribes the victim's WhatsApp account to attacker-controlled channels without user consent by issuing authenticated FOLLOW queries using the victim's own session. The target channels are obfuscated or dynamically fetched to evade detection. The malicious code does not steal credentials, maintain persistence, or execute arbitrary remote code.
AI Analysis
Technical Summary
The xzbails package contains malicious code that modifies the WhatsApp Web socket connection to issue an authenticated 'w:mex' FOLLOW query to attacker-chosen WhatsApp Channel/Newsletter JIDs. This action uses the installer's authenticated WhatsApp session to subscribe the victim's account to channels controlled by the attacker without the victim's knowledge. The target JIDs are hidden through obfuscation techniques or dynamically fetched from remote sources, allowing attackers to change targets post-installation. This behavior is consistent across a family of over 100 near-identical forks of the Baileys library. The malicious activity is limited to covert subscription actions and does not involve credential theft, persistence mechanisms, or arbitrary code execution.
Potential Impact
Victims unknowingly subscribe their WhatsApp accounts to attacker-controlled channels, potentially exposing them to unwanted content or spam. The attack leverages the victim's authenticated session but does not compromise credentials or enable further remote code execution. There is no indication of persistence or broader system compromise.
Mitigation Recommendations
No official patch or remediation guidance is provided. Users should avoid installing or using the affected xzbails package versions 0.0.3, 0.0.4, and 0.0.5. Review and verify the integrity of any Baileys WhatsApp Web library forks before use. Consider removing the package and any subscriptions to unknown WhatsApp channels. Monitor for updates from the package maintainers or security advisories for further remediation.
Malicious code in xzbails (npm)
Description
The xzbails npm package, versions 0.0.3, 0.0.4, and 0.0.5, is part of a large family of malicious forks of the Baileys WhatsApp Web library. These forks inject code that silently subscribes the victim's WhatsApp account to attacker-controlled channels without user consent by issuing authenticated FOLLOW queries using the victim's own session. The target channels are obfuscated or dynamically fetched to evade detection. The malicious code does not steal credentials, maintain persistence, or execute arbitrary remote code.
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The xzbails package contains malicious code that modifies the WhatsApp Web socket connection to issue an authenticated 'w:mex' FOLLOW query to attacker-chosen WhatsApp Channel/Newsletter JIDs. This action uses the installer's authenticated WhatsApp session to subscribe the victim's account to channels controlled by the attacker without the victim's knowledge. The target JIDs are hidden through obfuscation techniques or dynamically fetched from remote sources, allowing attackers to change targets post-installation. This behavior is consistent across a family of over 100 near-identical forks of the Baileys library. The malicious activity is limited to covert subscription actions and does not involve credential theft, persistence mechanisms, or arbitrary code execution.
Potential Impact
Victims unknowingly subscribe their WhatsApp accounts to attacker-controlled channels, potentially exposing them to unwanted content or spam. The attack leverages the victim's authenticated session but does not compromise credentials or enable further remote code execution. There is no indication of persistence or broader system compromise.
Mitigation Recommendations
No official patch or remediation guidance is provided. Users should avoid installing or using the affected xzbails package versions 0.0.3, 0.0.4, and 0.0.5. Review and verify the integrity of any Baileys WhatsApp Web library forks before use. Consider removing the package and any subscriptions to unknown WhatsApp channels. Monitor for updates from the package maintainers or security advisories for further remediation.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- MAL-2026-17410
- Osv Schema Version
- 1.7.4
- Ecosystems
- ["npm"]
Threat ID: 6abd30852a4e24523d340114
Added to database: 09/30/2026, 15:53:41 UTC
Last enriched: 09/30/2026, 15:59:59 UTC
Last updated: 09/30/2026, 22:38:48 UTC
Views: 2
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