Malicious code in pfa-prettier-config (npm)
--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (08f4b65c7534427cd8814e8c85a84b11c2201d10724c34bb99987bae83e0c5cc) The package is published as 'pfa-prettier-config' with description 'environment config reader', but contains no Prettier configuration or config-reading code. index.js unconditionally requires./_platform on load. _platform.js selects a per-OS asset path, fetches bytes from one of four Cloudflare Workers hosts (oob-worker.cf102-baf.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf99-9b3.workers.dev) — with hostnames reassembled at runtime via string-concat (e.g. ["oob-worker.cf","102-baf.workers.dev"].join("")) — and falls back to a chunked DNS TXT download from tin.dl.well1.site. The fetched bytes are written to /var/tmp/.cache_<hex> or %TEMP%/dotnet_diag_<hex>.exe under cover names, chmod'd 0755, and spawned detached via cp.spawn('/bin/sh', ['-c', fp+' &'], {detached:true}).unref() or spawn('cmd',...). A second dropper is shipped in lib/telemetry.js (~81KB, disguised as an 'Analytics SDK') containing the same primitives (base64 chunk decode, chmodSync 0755 on 'extensionPath', cp.spawn('/bin/sh', ['-c', filePath+' &'])), with child_process required via the computed string require('child_'+'process'). Requiring or importing this package triggers download-and-execute of an attacker-hosted OS-specific binary. ## Source: ghsa-malware (3d367f5160b47afe3e72f884621b4a8f8946a3a07dfcd5c4c9fbd659c57a2b2a) Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.
AI Analysis
Technical Summary
The 'pfa-prettier-config' npm package (version 20.9.1) is a malicious package that, upon being required or imported, downloads OS-specific binaries from attacker-controlled Cloudflare Workers endpoints or DNS TXT records. It writes these binaries to temporary locations with executable permissions and executes them detached from the main process using shell commands. The package contains two main malicious components: index.js, which triggers the initial download and execution, and lib/telemetry.js, a secondary dropper disguised as an analytics SDK that uses similar techniques to execute attacker payloads. This behavior enables remote code execution on the host system when the package is used.
Potential Impact
This package enables remote code execution on the host system by downloading and executing attacker-controlled binaries without user consent. This can lead to full system compromise, data theft, persistence, or further malware deployment. Since the malicious code executes automatically upon requiring or importing the package, any project depending on this package is at immediate risk.
Mitigation Recommendations
No official patch or remediation is currently available for this malicious package. Users should immediately remove 'pfa-prettier-config' version 20.9.1 from their projects and dependency trees. Avoid installing or using this package. Review dependency sources carefully and consider using trusted package registries or verified packages. Monitor for any suspicious activity on systems where this package was installed and perform incident response as needed.
Malicious code in pfa-prettier-config (npm)
Description
--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (08f4b65c7534427cd8814e8c85a84b11c2201d10724c34bb99987bae83e0c5cc) The package is published as 'pfa-prettier-config' with description 'environment config reader', but contains no Prettier configuration or config-reading code. index.js unconditionally requires./_platform on load. _platform.js selects a per-OS asset path, fetches bytes from one of four Cloudflare Workers hosts (oob-worker.cf102-baf.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf99-9b3.workers.dev) — with hostnames reassembled at runtime via string-concat (e.g. ["oob-worker.cf","102-baf.workers.dev"].join("")) — and falls back to a chunked DNS TXT download from tin.dl.well1.site. The fetched bytes are written to /var/tmp/.cache_<hex> or %TEMP%/dotnet_diag_<hex>.exe under cover names, chmod'd 0755, and spawned detached via cp.spawn('/bin/sh', ['-c', fp+' &'], {detached:true}).unref() or spawn('cmd',...). A second dropper is shipped in lib/telemetry.js (~81KB, disguised as an 'Analytics SDK') containing the same primitives (base64 chunk decode, chmodSync 0755 on 'extensionPath', cp.spawn('/bin/sh', ['-c', filePath+' &'])), with child_process required via the computed string require('child_'+'process'). Requiring or importing this package triggers download-and-execute of an attacker-hosted OS-specific binary. ## Source: ghsa-malware (3d367f5160b47afe3e72f884621b4a8f8946a3a07dfcd5c4c9fbd659c57a2b2a) Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The 'pfa-prettier-config' npm package (version 20.9.1) is a malicious package that, upon being required or imported, downloads OS-specific binaries from attacker-controlled Cloudflare Workers endpoints or DNS TXT records. It writes these binaries to temporary locations with executable permissions and executes them detached from the main process using shell commands. The package contains two main malicious components: index.js, which triggers the initial download and execution, and lib/telemetry.js, a secondary dropper disguised as an analytics SDK that uses similar techniques to execute attacker payloads. This behavior enables remote code execution on the host system when the package is used.
Potential Impact
This package enables remote code execution on the host system by downloading and executing attacker-controlled binaries without user consent. This can lead to full system compromise, data theft, persistence, or further malware deployment. Since the malicious code executes automatically upon requiring or importing the package, any project depending on this package is at immediate risk.
Mitigation Recommendations
No official patch or remediation is currently available for this malicious package. Users should immediately remove 'pfa-prettier-config' version 20.9.1 from their projects and dependency trees. Avoid installing or using this package. Review dependency sources carefully and consider using trusted package registries or verified packages. Monitor for any suspicious activity on systems where this package was installed and perform incident response as needed.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- MAL-2026-12407
- Osv Schema Version
- 1.7.4
- Ecosystems
- ["npm"]
Threat ID: 6a735745bf8831d539159f04
Added to database: 08/05/2026, 15:31:17 UTC
Last enriched: 08/05/2026, 17:24:36 UTC
Last updated: 09/07/2026, 23:51:39 UTC
Views: 17
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