Malicious code in @revizahoshii/hoshino (npm)
The npm package @revizahoshii/hoshino version 1.1.0 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 authenticated WhatsApp account to attacker-controlled channels without user consent. The target channels are obfuscated or dynamically fetched, allowing attackers to change targets post-installation. The malicious code abuses the installer's authenticated session but does not steal credentials, maintain persistence, or execute arbitrary code.
AI Analysis
Technical Summary
The @revizahoshii/hoshino package (version 1.1.0) 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 causes the victim's WhatsApp account to subscribe silently to these channels. The target JIDs are hidden via obfuscation or dynamically fetched from attacker-controlled sources, enabling flexible targeting. The attack leverages the installer's authenticated session but does not exfiltrate credentials or execute arbitrary remote code. This behavior is consistent across a family of over 100 near-identical malicious forks.
Potential Impact
Victims unknowingly subscribe their WhatsApp accounts to attacker-controlled channels, potentially exposing them to unwanted content or spam. The attack does not compromise credentials or allow arbitrary code execution, limiting the impact to unauthorized channel subscriptions.
Mitigation Recommendations
No official patch or remediation is currently documented. Users should avoid installing or using the @revizahoshii/hoshino package version 1.1.0 and related forks. Review installed npm packages for suspicious or forked Baileys WhatsApp Web libraries and remove any identified malicious versions. Monitor for updates from the package maintainers or npm advisories for potential fixes.
Malicious code in @revizahoshii/hoshino (npm)
Description
The npm package @revizahoshii/hoshino version 1.1.0 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 authenticated WhatsApp account to attacker-controlled channels without user consent. The target channels are obfuscated or dynamically fetched, allowing attackers to change targets post-installation. The malicious code abuses the installer's authenticated session but does not steal credentials, maintain persistence, or execute arbitrary code.
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The @revizahoshii/hoshino package (version 1.1.0) 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 causes the victim's WhatsApp account to subscribe silently to these channels. The target JIDs are hidden via obfuscation or dynamically fetched from attacker-controlled sources, enabling flexible targeting. The attack leverages the installer's authenticated session but does not exfiltrate credentials or execute arbitrary remote code. This behavior is consistent across a family of over 100 near-identical malicious forks.
Potential Impact
Victims unknowingly subscribe their WhatsApp accounts to attacker-controlled channels, potentially exposing them to unwanted content or spam. The attack does not compromise credentials or allow arbitrary code execution, limiting the impact to unauthorized channel subscriptions.
Mitigation Recommendations
No official patch or remediation is currently documented. Users should avoid installing or using the @revizahoshii/hoshino package version 1.1.0 and related forks. Review installed npm packages for suspicious or forked Baileys WhatsApp Web libraries and remove any identified malicious versions. Monitor for updates from the package maintainers or npm advisories for potential fixes.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- MAL-2026-17376
- Osv Schema Version
- 1.7.4
- Ecosystems
- ["npm"]
Threat ID: 6abd30852a4e24523d34014c
Added to database: 09/30/2026, 15:53:41 UTC
Last enriched: 09/30/2026, 16:04:10 UTC
Last updated: 09/30/2026, 22:39:42 UTC
Views: 2
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