🛡️ MAL-2026-12047 — streak-day-utils

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Malicious code in streak-day-utils (npm)

Source: amazon-inspector

index.mjs schedules an asynchronous routine at module load that decodes a table of hex-encoded strings to reconstruct references to process, fetch, child_process, /mnt/c, AppData, a Backblaze B2 URL, RenameMe.exe, and a VBScript body invoking WScript.Shell.Run hidden. When Node executes under WSL (detected via /mnt/c), the code enumerates Windows user profiles under /mnt/c/Users, downloads helper.tar.gz from https://f004.backblazeb2.com/file/dp8hbvocjd2fpza/helper.tar.gz, extracts it into the victim's AppData\Local\Microsoft\Windows\syscache directory, and writes vite-native-helper.vbs into the Windows Startup folder to auto-launch the extracted RenameMe.exe on every login. The behavior is presented under a 'vite-cache-sync' cover story, and all filesystem paths, the remote URL, and the VBScript payload are hex-obfuscated to conceal the dropper. Installing or importing this package causes cross-boundary WSL-to-Windows code execution and establishes persistence on the Windows host controlled by the package author.

Affected software

MAL-2026-12047 is recorded against 1 package.

  • streak-day-utils

Timeline and source

Published on 5 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

www.npmjs.com (Package)

Details

Severity Unknown
CVSS Score N/A
CVSS Vector N/A
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2026-08-05
Updated 2026-08-12
Modified 2026-08-05
Fix URL N/A

Affected Packages

Software From version Fixed in
streak-day-utils — —

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