Which versions of webdev-conf are malicious?

The following npm versions of webdev-conf are flagged malicious: 5.0.0. Treat any of these as compromised.

How do I remediate webdev-conf if I installed it?

webdev-conf establishes remote access, so treat any host that installed it as fully compromised. Isolate the machine, remove the package, rotate all credentials it could reach, and rebuild from a trusted image rather than cleaning in place — a backdoor may have planted additional persistence.

I already installed webdev-conf — how do I know if it already compromised me?

If webdev-conf 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.

Is webdev-conf part of a known attack campaign?

Yes — webdev-conf is associated with the IN-MAL-2026-011359 campaign. Packages in the same campaign often share infrastructure and payloads, so check whether any related packages are also in your dependency tree.

How do I find webdev-conf across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for webdev-conf (version 5.0.0).

Malicious package

webdev-confnpm

Advisory published Aug 4, 2026Updated Aug 5, 2026

webdev-conf is a confirmed malicious npm package (MAL-2026-12005) that opens a backdoor for remote access (malicious version 5.0.0). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in webdev-conf (npm)

MAL-2026-12005

Immediate action

Remove the package, then rotate any secrets the build/runtime could reach.

npm uninstall webdev-conf

What this malware does

[email protected] is a typosquat of the sindresorhus/pkg-conf library, published under author 'Sinde Sorus' [email protected] (homoglyph of Sindre Sorhus). index.js appends an eval(atob(...)) block after the legitimate library code. On require(), the decoded payload queries public Ethereum RPC endpoints and blockscout.com/api for the latest transaction sent from the attacker address 0xa322E5f3D311D3080e6f01210263e9aDC2490Ef1, extracts an IP address from that transaction, then fetches XOR-encrypted next-stage JavaScript from http://<IP>:443/0x/cls and http://<IP>:443/0x/ls, eval()s it in-process, and re-executes it via spawn('node', ['-e', payload], {detached:true, windowsHide:true}).unref(). Identifiers such as http, https, child_process, spawn, and the RPC URLs are hidden with \uXXXX unicode escapes. The C2 IP is rotatable by the attacker via on-chain transactions (EtherHiding technique). Any package that require()s webdev-conf triggers remote code execution on the installer's host.

Malicious versions

1 flagged

5.0.0

Indicators of compromise (SHA-256)

9577d9f40486af224c5dd365ffbab6a5d45c4a052dfe6de50bc1d8f130d9642a

Detection & response playbook

Backdoor / remote access

Find it
Search your lockfiles and build artifacts for webdev-conf (version 5.0.0).
If you installed it — respond
webdev-conf establishes remote access, so treat any host that installed it as fully compromised. Isolate the machine, remove the package, rotate all credentials it could reach, and rebuild from a trusted image rather than cleaning in place — a backdoor may have planted additional persistence.
Did it already run?
If webdev-conf 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

No. webdev-conf on npm has been identified as a malicious package (version 5.0.0 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-011359

References

npmjs.com

Credits

Amazon Inspector · finder

Detect & block this

O3 blocks webdev-conf-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the C2 callback and severs the channel.

Malware detection Runtime egress monitoring

Explore

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