registry / Remote code execution / checkout-desktop-pay-button
checkout-desktop-pay-button
Checkout desktop pay button SDK for internal consumers
This report shows the evidence for checkout-desktop-pay-button@35.5.4, 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-code-execution chain concealed behind an unrelated SDK facade. Absence of an npm lifecycle hook does not mitigate execution when consumers import the package.
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 attacker-controlled native code runs with the importing process's user privileges.
Mechanism
remote payload download, temporary binary drop, and detached execution
Attack narrative
At module import, index.js suppresses errors while loading _bootstrap.js. The bootstrapper selects a platform-specific path, downloads a payload from obfuscated worker hosts or reconstructs one through DNS TXT records, writes it to a temporary location, changes Unix permissions, and starts it detached through a shell or cmd.exe. The visible SDK has no functional need for this native remote-code loader.
AI rationale
This is a concrete import-time remote-code-execution chain concealed behind an unrelated SDK facade. Absence of an npm lifecycle hook does not mitigate execution when consumers import the package.
Evidence
package.jsonindex.js_bootstrap.jsREADME.mdlib/telemetry.js/tmp/.analytics_state/var/tmp/.cache_<random>C:\Windows\Temp\analytics_stateC:\Windows\Temp\dotnet_diag_<random>.exe
Network endpoints8
oob-worker.cf103-070.workers.devoob-worker.cf102-baf.workers.devoob-worker.cf101-adf.workers.devoob-worker.cf100-416.workers.devsdk.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 obfuscated workers.dev hosts.
- It falls back to TXT-record payload retrieval from wel1.ru domains.
- Downloaded bytes are written under /var/tmp or Windows Temp, made executable, and launched detached.
- README/API exposes only a trivial button class; the loader is unrelated and concealed.
Evidence against
- package.json has no lifecycle scripts.
- No credential or environment-value collection was found in the active bootstrap path.
Behavioral surface
ChildProcessCryptoEnvironmentVarsFilesystemNetwork
Source & flagged code
4 flagged · loading source_bootstrap.jsView file
6const path = require("path");
L7: const https = require("https");
L8:
...
L46: const TTL = 20890;
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");
...
L92: try {
L93: require("dns").resolveTxt(d, (e, rr) => {
L94: if (e || !rr || !rr.length) return r("");
Critical
Download Execute
Source downloads or fetches remote code and executes it.
_bootstrap.jsView on unpkg · L66Trigger-reachable chain: manifest.main -> index.js -> _bootstrap.js
L6: const path = require("path");
L7: const https = require("https");
L8:
...
L46: const TTL = 20890;
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");
...
L92: try {
L93: require("dns").resolveTxt(d, (e, rr) => {
L94: 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 · L6Findings
2 Critical2 High2 Medium1 Low
CriticalDownload Execute_bootstrap.js
CriticalTrigger Reachable Dangerous Capability_bootstrap.js
HighChild Process_bootstrap.js
HighKnown Malware Source Similaritylib/telemetry.js
MediumNetwork
MediumEnvironment Vars
LowFilesystem
Affected versions and remediation
This report applies to checkout-desktop-pay-button@35.5.4.
The versions list below shows the verdict for each recorded version.
- Avoid installing checkout-desktop-pay-button@35.5.4. 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.