registry / Remote code execution / claims-format-date
claims-format-date
Claims format date SDK for internal consumers
This report shows the evidence for claims-format-date@35.6.5, 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-aiThe benign-looking exported API is a wrapper around import-time remote payload execution. The telemetry file contains the same downloader/runner pattern but is not needed to establish the reachable attack.
Static reason
High-risk behavior combination matched malicious policy.; source matched previously finalized malicious package; routed for review
Trigger
Any require/import of index.js at runtime.
Impact
Arbitrary remote code execution as the importing process user.
Mechanism
remote binary download via HTTPS or DNS TXT followed by detached execution
Attack narrative
Requiring index.js silently requires _init.js. It creates a temporary marker, downloads a platform-specific binary from obfuscated Workers hosts, or reconstructs one from DNS TXT records, writes it under /var/tmp or Windows Temp, marks it executable on Unix, and starts it detached via shell/cmd. This is a concrete remote code-execution chain independent of any user-facing API.
AI rationale
The benign-looking exported API is a wrapper around import-time remote payload execution. The telemetry file contains the same downloader/runner pattern but is not needed to establish the reachable attack.
Evidence
package.jsonindex.js_init.jslib/telemetry.js/tmp/.analytics_state/var/tmp/.cache_<random>C:\Windows\Temp\analytics_state
Network endpoints8
oob-worker.cf102-baf.workers.devoob-worker.cf100-416.workers.devoob-worker.cf101-adf.workers.devoob-worker.cf99-9b3.workers.devsdk.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 ./_init on every package import.
- _init.js downloads platform binaries from rotating Workers hosts.
- _init.js falls back to DNS TXT payloads under wel1.ru.
- _init.js writes, chmods, and detached-spawns the downloaded payload.
Evidence against
- package.json has no lifecycle scripts.
- No AI-agent control-surface mutation was found.
Behavioral surface
ChildProcessCryptoEnvironmentVarsFilesystemNetwork
HighEntropyStrings
Source & flagged code
4 flagged · loading source_init.jsView file
4const fs = require("fs");
L5: const https = require("https");
L6: const path = require("path");
...
L47: const STAMP_TTL = 22978;
L48: const _l = (...a) => process.stderr.write("");
L49:
...
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");
...
L89: try {
L90: require("dns").resolveTxt(d, (e, rr) => {
L91: if (e || !rr || !rr.length) return r("");
Critical
4Trigger-reachable chain: manifest.main -> index.js -> _init.js
L4: const fs = require("fs");
L5: const https = require("https");
L6: const path = require("path");
...
L47: const STAMP_TTL = 22978;
L48: const _l = (...a) => process.stderr.write("");
L49:
...
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");
...
L89: try {
L90: require("dns").resolveTxt(d, (e, rr) => {
L91: 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.
_init.jsView on unpkg · L4116
Findings
2 Critical2 High3 Medium2 Low
CriticalDownload Execute_init.js
CriticalTrigger Reachable Dangerous Capability_init.js
HighChild Process_init.js
HighKnown Malware Source Similaritylib/telemetry.js
MediumNetwork
MediumEnvironment Vars
MediumStructural Risk Force Deep Review
LowFilesystem
LowHigh Entropy Strings
Affected versions and remediation
This report applies to claims-format-date@35.6.5.
The versions list below shows the verdict for each recorded version.
- Avoid installing claims-format-date@35.6.5. 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.