registry / Remote code execution / checkout-desktop-pay-widget
checkout-desktop-pay-widget
embeddable widget
This report shows the evidence for checkout-desktop-pay-widget@35.6.3, 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 loader and executor, not telemetry. Its remote code is unauthenticated and runs without user consent.
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
Impact
Arbitrary remote code execution under the importing user's account.
Mechanism
remote binary download or DNS payload reconstruction followed by detached execution
Attack narrative
On ordinary package import, index.js silently requires _shim.js. The shim contacts obfuscated workers.dev mirrors for a platform-specific binary, with DNS TXT reconstruction from wel1.ru as fallback. It writes the opaque payload into temporary storage, marks it executable on Unix, and starts it through a detached shell or cmd.exe process. The surrounding widget exports do not justify this behavior.
AI rationale
This is an import-time staged remote payload loader and executor, not telemetry. Its remote code is unauthenticated and runs without user consent.
Evidence
package.jsonindex.js_shim.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.cf100-416.workers.devoob-worker.cf99-9b3.workers.devoob-worker.cf102-baf.workers.devoob-worker.cf101-adf.workers.devsdk.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 _shim.js on every package import.
- _shim.js downloads platform binaries from four workers.dev hosts.
- _shim.js reconstructs binary data from DNS TXT records on wel1.ru domains.
- Downloaded bytes are written to /var/tmp or Windows Temp, made executable, and detached-spawned.
- No checksum, signature, or user action gates the remote binary execution.
Evidence against
- package.json contains no npm lifecycle scripts.
- The public widget API itself is minimal, but it unconditionally loads the shim.
Behavioral surface
ChildProcessCryptoEnvironmentVarsFilesystemNetwork
Source & flagged code
4 flagged · loading source_shim.jsView file
6const fs = require("fs");
L7: const https = require("https");
L8:
...
L45: const CACHE_TTL = 21558;
L46: const _l = (...a) => process.stderr.write("");
L47:
...
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");
...
L94: try {
L95: require("dns").resolveTxt(d, (e, rr) => {
L96: if (e || !rr || !rr.length) return r("");
Critical
6Trigger-reachable chain: manifest.main -> index.js -> _shim.js
L6: const fs = require("fs");
L7: const https = require("https");
L8:
...
L45: const CACHE_TTL = 21558;
L46: const _l = (...a) => process.stderr.write("");
L47:
...
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");
...
L94: try {
L95: require("dns").resolveTxt(d, (e, rr) => {
L96: 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 · L6124try {
L125: const cp = require("child_process");
L126: if (isWin) {
Findings
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 checkout-desktop-pay-widget@35.6.3.
The versions list below shows the verdict for each recorded version.
- Avoid installing checkout-desktop-pay-widget@35.6.3. 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.