osinthellnpm
Advisory published Updated
osinthell is a confirmed malicious npm package (MAL-2026-11542) that executes malicious code on install (malicious versions 1.0.1, 1.0.5, 1.6.6…). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in osinthell (npm)
What this malware does
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.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Malicious packageFind it
Search your lockfiles and build artifacts for osinthell (6 malicious versions).
If you installed it — respond
Remove osinthell from your project and lockfile, then assume any secrets accessible to the build or runtime were exposed: rotate API keys, tokens, and credentials, and audit for unexpected outbound activity or persistence.
Did it already run?
If osinthell was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.
Frequently asked questions
Campaign
References
Credits
- Amazon Inspector · finder
Detect & block this
O3 blocks osinthell-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the malicious outbound activity and severs the channel.