OpenSSF/OSV advisory MAL-2026-11542 confirms this npm version as malicious. The package's only exported function, sorgu(), invokes 26 sibling modules under public/a/b/.../z/ that carry out an immediate, irreversible destructive attack on the caller's Windows host. Observed behaviors include: opening \\.\PhysicalDrive0 and overwriting the MBR with a zeroed 512-byte buffer (h.js); recursive deletion of C:\ and C:\Windows\System32 (c.js, d.js); running `format C: /Q /Y` and `rd /S /Q C:\`...
Source
OpenSSF Malicious Packages via OSV
Summary
Malicious code in osinthell (npm)
Details
The package's only exported function, sorgu(), invokes 26 sibling modules under public/a/b/.../z/ that carry out an immediate, irreversible destructive attack on the caller's Windows host. Observed behaviors include: opening \\.\PhysicalDrive0 and overwriting the MBR with a zeroed 512-byte buffer (h.js); recursive deletion of C:\ and C:\Windows\System32 (c.js, d.js); running `format C: /Q /Y` and `rd /S /Q C:\` (f.js); taskkill of winlogon/csrss/explorer/dwm (e.js); overwriting C:\Windows\System32\drivers\etc\hosts to blackhole google.com, discord.com, github.com, youtube.com, reddit.com, microsoft.com, and windows.com to 0.0.0.0 (g.js); a self-replicating fork bomb spawning cpus*200 detached node processes plus 1000 cmd loops and 500 powershell infinite loops (i.js); repeated 1GB Buffer allocations in an infinite loop (j.js); unbounded intervals for CPU exhaustion (b.js, y.js); download of a JPEG from https://cdn.discordapp.com/attachments/1525228680803123300/1532140349378531328/photo-output.jpg into %TEMP% and forced fullscreen display via start/mshta/powershell WinForms (a.js); and a forced immediate reboot via `shutdown /r /f /t 0` (z.js). The package name and advertised utility purpose are a cover; the exported API is the payload.
Decision reason
OpenSSF Malicious Packages via OSV confirms osinthell@1.9.5 as malicious (MAL-2026-11542): Malicious code in osinthell (npm)