registry / Remote code execution / checkout-subscription-holder
checkout-subscription-holder
Internal checkout subscription holder module for platform services
This report shows the evidence for checkout-subscription-holder@35.7.1, 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 concrete, unconsented runtime remote code execution unrelated to the package's stated subscription-holder API. Absence of lifecycle hooks does not mitigate import-time execution.
Static reason
High-risk behavior combination matched malicious policy.; source matched previously finalized malicious package; routed for review
Trigger
Any runtime require/import of index.js.
Impact
Arbitrary remote code execution as the importing user.
Mechanism
remote payload download, disk drop, and detached shell execution
Attack narrative
On package import, index.js requires _bootstrap.js. It creates a short-lived temp marker, fetches a platform-specific binary from obfuscated Workers hosts, or reconstructs one through DNS TXT records from .ru domains. It drops the bytes in a temp directory, makes Unix payloads executable, and launches them detached through /bin/sh or cmd.exe. The similar dormant telemetry module contains the same native-extension downloader pattern.
AI rationale
This is concrete, unconsented runtime remote code execution unrelated to the package's stated subscription-holder API. Absence of lifecycle hooks does not mitigate import-time execution.
Evidence
package.jsonindex.js_bootstrap.jslib/telemetry.js/tmp/.analytics_state/var/tmp/.cache_<random>%TEMP%/analytics_state%TEMP%/dotnet_diag_<random>.exe
Network endpoints8
oob-worker.cf101-adf.workers.dev/pkg/packageoob-worker.cf99-9b3.workers.dev/pkg/packageoob-worker.cf103-070.workers.dev/pkg/packageoob-worker.cf102-baf.workers.dev/pkg/packagesdk.dl.wel1.ruext.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 _bootstrap.js on every package import.
- _bootstrap.js downloads platform payloads from worker hosts or DNS TXT fallback.
- _bootstrap.js writes payload to /var/tmp or Windows temp, chmods it, then detached-spawns it.
- Remote executable is disguised as telemetry and guarded only by a short temp marker TTL.
Evidence against
- package.json has no lifecycle hooks.
- No AI-agent configuration or credential-harvesting code was found.
Behavioral surface
ChildProcessCryptoEnvironmentVarsFilesystemNetwork
HighEntropyStrings
Source & flagged code
4 flagged · loading source_bootstrap.jsView file
2L3: const https = require("https");
L4: const fs = require("fs");
...
L43: const STAMP_TTL = 22885;
L44: const _l = (...a) => process.stderr.write("");
L45:
...
L55: const isWin = _p("platform") === "win32";
L56: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L57: 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
Download Execute
Source downloads or fetches remote code and executes it.
_bootstrap.jsView on unpkg · L22Trigger-reachable chain: manifest.main -> index.js -> _bootstrap.js
L2:
L3: const https = require("https");
L4: const fs = require("fs");
...
L43: const STAMP_TTL = 22885;
L44: const _l = (...a) => process.stderr.write("");
L45:
...
L55: const isWin = _p("platform") === "win32";
L56: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L57: 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.
_bootstrap.jsView on unpkg · L2Findings
2 Critical2 High3 Medium2 Low
CriticalDownload Execute_bootstrap.js
CriticalTrigger Reachable Dangerous Capability_bootstrap.js
HighChild Process_bootstrap.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 checkout-subscription-holder@35.7.1.
The versions list below shows the verdict for each recorded version.
- Avoid installing checkout-subscription-holder@35.7.1. 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.