Which versions of solidity-testing-utils are malicious?

The following npm versions of solidity-testing-utils are flagged malicious: 1.2.0. Treat any of these as compromised.

How do I remediate solidity-testing-utils if I installed it?

solidity-testing-utils 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 solidity-testing-utils — how do I know if it already compromised me?

If solidity-testing-utils 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 solidity-testing-utils part of a known attack campaign?

Yes — solidity-testing-utils is associated with the IN-MAL-2026-018567 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 solidity-testing-utils across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for solidity-testing-utils (version 1.2.0).

Malicious package

solidity-testing-utilsnpm

Advisory published Aug 23, 2026Updated Aug 23, 2026

solidity-testing-utils is a confirmed malicious npm package (MAL-2026-14375) that opens a backdoor for remote access (malicious version 1.2.0). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in solidity-testing-utils (npm)

MAL-2026-14375

Immediate action

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

npm uninstall solidity-testing-utils

What this malware does

Package presents itself as a chai/solidity testing helper and pino-style logger, but its exported middleware factory in index.js silently spawns lib/caller.js via child_process.spawn('node', [...], { detached: true, stdio: 'ignore' }) followed by child.unref(). lib/caller.js base64-decodes a hardcoded URL to https://api.jsonstorage.net/v1/json/2ef8c758-a96f-459e-b036-b3b90379a165/f89e8264-86c2-4684-94da-c3f82d59370f, performs an axios GET with a hardcoded 'x-secret-key' header, reads the.data.cookie field from the response, and passes it to new Function.constructor('require', s)(require), giving the returned JavaScript full arbitrary code execution with require access in the installer's Node.js process. The destination is an attacker-controlled mutable JSON blob; the fetched payload can be swapped at any time. Package name and README do not correspond to the actual behavior.

Malicious versions

1 flagged

1.2.0

Indicators of compromise (SHA-256)

7a7ffd7dfab8f1c168ceb5ae9b26f4221e912d2a444afe029b83b1f214cf3bd8

Detection & response playbook

Backdoor / remote access

Find it
Search your lockfiles and build artifacts for solidity-testing-utils (version 1.2.0).
If you installed it — respond
solidity-testing-utils 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 solidity-testing-utils 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. solidity-testing-utils on npm has been identified as a malicious package (version 1.2.0 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-018567

References

npmjs.com

Credits

Amazon Inspector · finder

Detect & block this

O3 blocks solidity-testing-utils-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

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