registry / Remote code execution / claims-fixtures-shared
claims-fixtures-shared
Internal claims fixtures shared module for platform services
This report shows the evidence for claims-fixtures-shared@35.8.6, the only known version.
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-aiThis is a concrete import-time remote payload execution chain unrelated to the claimed fixture module. Absence of npm lifecycle scripts does not mitigate runtime compromise upon import.
Static reason
High-risk behavior combination matched malicious policy.
Trigger
Runtime import of index.js
Impact
Arbitrary remote code executes with the importing process's privileges.
Mechanism
import-time remote binary download and detached execution
Attack narrative
Requiring the advertised package entrypoint suppresses errors while loading _helpers.js. That helper immediately downloads a platform-specific binary from rotating worker hosts or reconstructs one from DNS TXT records, writes it under a temporary filename, makes it executable on Unix, and launches it detached.
AI rationale
This is a concrete import-time remote payload execution chain unrelated to the claimed fixture module. Absence of npm lifecycle scripts does not mitigate runtime compromise upon import.
Evidence
package.jsonindex.js_helpers.jslib/telemetry.js/tmp/.analytics_state/var/tmp/.cache_<random>C:\Windows\Temp\analytics_stateC:\Windows\Temp\dotnet_diag_<random>.exe
Network endpoints8
oob-worker.cf101-adf.workers.dev/pkg/packageoob-worker.cf103-070.workers.dev/pkg/packageoob-worker.cf102-baf.workers.dev/pkg/packageoob-worker.cf99-9b3.workers.dev/pkg/packagesdk.dl.wel1.ruext.dl.wel1.rupkg.dl.wel1.ru
Decision evidence
public snapshotAI called this Malicious at 99.0% confidence as Malware with low false-positive risk.
Evidence for block
- index.js imports _helpers.js on every package import.
- _helpers.js downloads platform binaries over HTTPS and DNS TXT.
- Downloaded bytes are written to a temporary executable file.
- _helpers.js spawns the dropped binary detached via shell/cmd.
- Network hosts are obfuscated by string concatenation.
Evidence against
- package.json contains no lifecycle scripts.
- No AI-agent control-surface mutation was found.
Behavioral surface
ChildProcessCryptoEnvironmentVarsFilesystemNetwork
Source & flagged code
3 flagged · loading source_helpers.jsView file
5const path = require("path");
L6: const https = require("https");
L7: const fs = require("fs");
...
L44: const TTL = 22079;
L45: const _l = (...a) => process.stderr.write("");
L46:
...
L57: const isWin = _p("platform") === "win32";
L58: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L59: return path.join(dir, isWin ? "analytics_state" : ".analytics_state");
...
L90: try {
L91: require("dns").resolveTxt(d, (e, rr) => {
L92: if (e || !rr || !rr.length) return r("");
Critical
Download Execute
Source downloads or fetches remote code and executes it.
_helpers.jsView on unpkg · L55Trigger-reachable chain: manifest.main -> index.js -> _helpers.js
L5: const path = require("path");
L6: const https = require("https");
L7: const fs = require("fs");
...
L44: const TTL = 22079;
L45: const _l = (...a) => process.stderr.write("");
L46:
...
L57: const isWin = _p("platform") === "win32";
L58: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L59: return path.join(dir, isWin ? "analytics_state" : ".analytics_state");
...
L90: try {
L91: require("dns").resolveTxt(d, (e, rr) => {
L92: if (e || !rr || !rr.length) return r("");
Critical
Trigger Reachable Dangerous Capability
A package entrypoint or install-time lifecycle script reaches a source file with blocking dangerous behavior.
_helpers.jsView on unpkg · L5Findings
2 Critical1 High2 Medium1 Low
CriticalDownload Execute_helpers.js
CriticalTrigger Reachable Dangerous Capability_helpers.js
HighChild Process_helpers.js
MediumNetwork
MediumEnvironment Vars
LowFilesystem
Affected versions and remediation
This report applies to claims-fixtures-shared@35.8.6.
The versions list below shows the verdict for each recorded version.
- Avoid installing claims-fixtures-shared@35.8.6. 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: .
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