Malicious code in booking-tasks (npm)
--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (08305a6c73bd94f2983c949316cb78fef7f7169f85523a773c94fb305874e063) The package's package.json declares a postinstall hook `wscript.exe 4444.vbs` that fires automatically on `npm install`. The bundled 4444.vbs contains hand-rolled AES-128 (with XOR-masked forward/inverse S-boxes), a ChaCha20-IETF stream, XOR-masked SHA-256 round constants, a Base64 decoder via MSXML DOM, and a chunked Base64 ciphertext blob (ArtifactBundleHX, ~665 chunks). At install time the VBScript decrypts these chunks into a PowerShell loader, writes it to %TEMP%\pf<rand>.dat, and hands it to powershell.exe for process hollowing, giving the publisher arbitrary code execution on the installer's Windows host. The shipped library surface (src/index.js) is a small Zod-validated `checkEligibility()` function that never references 4444.vbs, and readme.md states 'No network requests. No personal data storage. No installation scripts.' — a direct contradiction of the declared postinstall hook, indicating the source module is a decoy for the dropper. The multi-primitive crypto and chunked-Base64 encoding of the payload serve only to hide executable content from static inspection.
Malicious code in booking-tasks (npm)
Description
--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (08305a6c73bd94f2983c949316cb78fef7f7169f85523a773c94fb305874e063) The package's package.json declares a postinstall hook `wscript.exe 4444.vbs` that fires automatically on `npm install`. The bundled 4444.vbs contains hand-rolled AES-128 (with XOR-masked forward/inverse S-boxes), a ChaCha20-IETF stream, XOR-masked SHA-256 round constants, a Base64 decoder via MSXML DOM, and a chunked Base64 ciphertext blob (ArtifactBundleHX, ~665 chunks). At install time the VBScript decrypts these chunks into a PowerShell loader, writes it to %TEMP%\pf<rand>.dat, and hands it to powershell.exe for process hollowing, giving the publisher arbitrary code execution on the installer's Windows host. The shipped library surface (src/index.js) is a small Zod-validated `checkEligibility()` function that never references 4444.vbs, and readme.md states 'No network requests. No personal data storage. No installation scripts.' — a direct contradiction of the declared postinstall hook, indicating the source module is a decoy for the dropper. The multi-primitive crypto and chunked-Base64 encoding of the payload serve only to hide executable content from static inspection.
Affected software
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Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- MAL-2026-17317
- Osv Schema Version
- 1.7.4
- Ecosystems
- ["npm"]
Threat ID: 6abcdde70df196e1a9da732f
Added to database: 09/30/2026, 10:01:11 UTC
Last updated: 09/30/2026, 13:23:09 UTC
Views: 2
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