registry / Remote code execution / arbocrate-sla-prober-arbocrate-sla-prober-core

arbocrate-sla-prober-arbocrate-sla-prober-core

core runtime

This report shows the evidence for arbocrate-sla-prober-arbocrate-sla-prober-core@7.5.9. 5 of 5 known versions are blocked or flagged. The newest version, 12.7.1, is blocked. See all versions.

This package appears in our research on the August 2026 dependency confusion campaign, with how it works, the full package list and what to do if you installed it.

AI Security Review

scanned 3mo ago · by lpm-firewall-ai

The documented telemetry claim is inconsistent with the import-time download-and-execute behavior. No lifecycle hook is needed because ordinary package import activates the payload chain.

Static reason

No blocking static signals were detected.; previous stored version diff introduced dangerous source

Trigger

Any application requiring the package.

Impact

Arbitrary native code executes with the privileges of the importing process.

Mechanism

import-time remote payload download, drop, and detached execution

Attack narrative

index.js silently requires setup.js during normal import. setup.js fetches an opaque platform-specific binary from obfuscated worker domains, with DNS TXT as fallback; it writes the bytes to a temporary executable, starts it detached with output discarded, then attempts deletion after five seconds. This is an unconsented remote-code-execution loader, not telemetry.

AI rationale

The documented telemetry claim is inconsistent with the import-time download-and-execute behavior. No lifecycle hook is needed because ordinary package import activates the payload chain.

Evidence

package.jsonindex.jssetup.jsREADME.md/tmp/.analytics_state/var/tmp/.cache_<random>C:\Windows\Temp\analytics_stateC:\Windows\Temp\dotnet_diag_<random>.exe

Network endpoints9

oob-worker.cf99-9b3.workers.dev/pkg/packageoob-worker.cf100-416.workers.dev/pkg/packageoob-worker.cf101-adf.workers.dev/pkg/packageoob-worker.cf102-baf.workers.dev/pkg/package

Decision evidence

public snapshot

AI called this Malicious at 99.0% confidence as Malware with low false-positive risk.

Evidence for block

index.js imports setup.js on every require.
setup.js downloads opaque platform binaries from worker domains or DNS TXT.
setup.js writes payloads to /var/tmp or temp and chmods them executable.
setup.js detached-executes the downloaded file and suppresses output.

Evidence against

package.json has no npm lifecycle scripts.
index.js otherwise contains only a small inert API.

Behavioral surface

Source

ChildProcessCryptoEnvironmentVarsFilesystemNetwork

Supply chainNo supply-chain packaging signals triggered.

ManifestNo manifest risk signals triggered.

scanned 2 file(s), 4.84 KB of source

Source & flagged code

1 flagged

setup.jsView file

•matchType = previous_version_dangerous_delta matchedPackage = arbocrate-sla-prober-arbocrate-sla-prober-core@7.5.7 matchedIdentity = npm:[redacted]:7.5.7 similarity = 0.500 summary = stored previous version shares package body but lacks this dangerous source file

High

Previous Version Dangerous Delta

This package version adds a dangerous source file absent from the previous stored version; route for source-aware review.

setup.jsView on unpkg

Source & flagged code

1 flagged · loading source

setup.jsView file

High

Previous Version Dangerous Delta

This package version adds a dangerous source file absent from the previous stored version; route for source-aware review.

setup.jsView on unpkg

Findings

1 High2 Medium1 Low

HighPrevious Version Dangerous Deltasetup.js

MediumNetwork

MediumEnvironment Vars

LowFilesystem

Affected versions and remediation

This report applies to arbocrate-sla-prober-arbocrate-sla-prober-core@7.5.9.

The versions list below shows the verdict for each recorded version.

Avoid installing arbocrate-sla-prober-arbocrate-sla-prober-core@7.5.9. Remove it from direct dependencies and check your lockfile for transitive copies.
Choose an independently verified alternative or release. This report does not establish that other versions are safe.
If this version ran, investigate the affected machine and build environment. Rotate credentials it could access and rebuild from a trusted environment.

Evidence last updated: 2026-08-05 09:30:28.000Z (UTC).

Source advisory published: 2026-08-05 09:16:59.000Z (UTC).

Think this verdict is wrong? Dispute it on GitHub or read how reports are produced.

Versions

5 known versions

12.7.1latestMaliciousMalwareBlockPublishedAug 1, 2026, 1:04 PM 7.5.9shownMaliciousRemote Code ExecutionBlockPublishedAug 1, 2026, 11:30 AM 7.5.8MaliciousRemote Code ExecutionBlockPublishedAug 1, 2026, 11:22 AM 7.5.7MaliciousMalware

AI Security Review

Decision evidence

Source & flagged code

Source & flagged code

Findings

Affected versions and remediation

Versions

Related packages

Other remote code execution packages

Source & flagged code

Related packages

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