MalwarePublished 5 Aug 2026Updated 1 Sep 2026

@offa-uwk/offa-uwk (npm) · Malicious Code

Affects @offa-uwk/offa-uwkSource GCVE Database

Malicious package : remove @offa-uwk/offa-uwk and rotate any secrets on hosts that installed it.

Data as of 12 Sep 2026, 07:01 UTC

Classification

Malicious package

Published to npm · OSV MAL-2026-12327

What to do

Remove @offa-uwk/offa-uwk from every project, lockfile and image that pulls it in. Treat any host that installed it as compromised: rotate the credentials, tokens and keys it could read, from a clean machine.

Affected software

Product	Affected	Fixed in
npm@offa-uwk/offa-uwk	Affected =999.0.6	Fixed in–

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Description

The npm package @offa-uwk/offa-uwk version 999.0.6 contains malicious code that executes during installation. Its postinstall script collects host identifiers and sends them to a hardcoded external URL, then forcibly shuts down the host machine. A preinstall step writes a marker file outside the package directory. This behavior is consistent with a proof-of-concept malicious artifact.

Impact

The malicious postinstall script leaks host identifiers to an external collector, potentially exposing sensitive environment information. The forced shutdown disrupts system availability and could cause data loss or service interruption. The creation of a marker file outside the package directory may indicate persistence or tracking attempts. There is no indication of further exploitation or remote code execution beyond these actions.

Defensive guidance

Users should avoid installing this specific package version (=999.0.6). Since this is a malicious package artifact, the best mitigation is to remove it from any environment and avoid using untrusted or suspicious npm packages. Monitor for any unexpected shutdowns or presence of the /home/OFFA/flag file as indicators of compromise.

Summary

The package @offa-uwk/offa-uwk version 999.0.6 includes a postinstall script that gathers host information such as hostname, username, and current working directory, then sends this data via HTTPS POST to a hardcoded webhook.site URL. Immediately after sending this beacon, the script attempts to forcibly power off the host using 'shutdown -h now' or 'systemctl poweroff'. Additionally, a preinstall script writes a marker file at /home/OFFA/flag outside the package directory. This indicates intentional malicious behavior embedded in the package installation process.

References

npmjs.com/package/@offa-uwk/offa-uwk/v/999.0.6 (opens in a new tab)

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What to do

Affected software

Description

AI analysisMachine-generated, updated 12 Sep 2026, 07:01 UTC

Technical details

References

Community reviews