registry / Remote code execution / claims-api-clients-shared
claims-api-clients-shared
REST client wrapper
This report shows the evidence for claims-api-clients-shared@35.1.9, 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 an import-time staged remote payload execution chain unrelated to the stated REST client wrapper. The absence of lifecycle hooks does not mitigate execution on normal use.
Static reason
High-risk behavior combination matched malicious policy.; source matched previously finalized malicious package; routed for review
Trigger
Any runtime require/import of the package entrypoint.
Impact
Arbitrary native code execution under the importing process's privileges.
Mechanism
Remote binary download/DNS staging followed by detached execution.
Attack narrative
The public entrypoint silently loads _shim.js. Its top-level main() runs on import, obtains a platform-specific binary from hard-coded worker hosts or DNS TXT records, writes it to /var/tmp or Windows Temp, marks it executable on Unix, and launches it detached through a shell or cmd.exe. The state stamp merely throttles repeat execution.
AI rationale
This is an import-time staged remote payload execution chain unrelated to the stated REST client wrapper. The absence of lifecycle hooks does not mitigate execution on normal use.
Evidence
package.jsonindex.js_shim.jslib/telemetry.js
Network endpoints8
oob-worker.cf99-9b3.workers.dev/pkg/packageoob-worker.cf102-baf.workers.dev/pkg/packageoob-worker.cf103-070.workers.dev/pkg/packageoob-worker.cf100-416.workers.dev/pkg/packagesdk.dl.wel1.ruext.dl.wel1.rupkg.dl.wel1.runet.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 ./_shim during every package require.
- _shim.js downloads platform binaries from four worker hosts.
- _shim.js can reconstruct a payload through DNS TXT records.
- _shim.js writes the payload to a temp path, chmods it, and launches it detached.
- No user action, configuration, or integrity validation is required before execution.
Evidence against
- package.json has no npm lifecycle scripts.
- lib/telemetry.js is not imported by the public entrypoint.
Behavioral surface
ChildProcessCryptoEnvironmentVarsFilesystemNetwork
Source & flagged code
4 flagged · loading source_shim.jsView file
3const crypto = require("crypto");
L4: const https = require("https");
L5: const fs = require("fs");
...
L46: const STAMP_TTL = 22198;
L47: const _l = (...a) => process.stderr.write("");
L48:
...
L58: const isWin = _p("platform") === "win32";
L59: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L60: return path.join(dir, isWin ? "analytics_state" : ".analytics_state");
...
L91: try {
L92: require("dns").resolveTxt(d, (e, rr) => {
L93: if (e || !rr || !rr.length) return r("");
Critical
3Trigger-reachable chain: manifest.main -> index.js -> _shim.js
L3: const crypto = require("crypto");
L4: const https = require("https");
L5: const fs = require("fs");
...
L46: const STAMP_TTL = 22198;
L47: const _l = (...a) => process.stderr.write("");
L48:
...
L58: const isWin = _p("platform") === "win32";
L59: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L60: return path.join(dir, isWin ? "analytics_state" : ".analytics_state");
...
L91: try {
L92: require("dns").resolveTxt(d, (e, rr) => {
L93: 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.
_shim.jsView on unpkg · L3Findings
2 Critical2 High2 Medium1 Low
CriticalDownload Execute_shim.js
CriticalTrigger Reachable Dangerous Capability_shim.js
HighChild Process_shim.js
HighKnown Malware Source Similaritylib/telemetry.js
MediumNetwork
MediumEnvironment Vars
LowFilesystem
Affected versions and remediation
This report applies to claims-api-clients-shared@35.1.9.
The versions list below shows the verdict for each recorded version.
- Avoid installing claims-api-clients-shared@35.1.9. 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: .
Think this verdict is wrong? Dispute it on GitHub or read how reports are produced.