registry / Remote code execution / checkout-mobile-cashback
checkout-mobile-cashback
mobile SDK
This report shows the evidence for checkout-mobile-cashback@35.4.9, 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 a concrete import-time staged native payload execution chain unrelated to the small advertised SDK API. The bundled telemetry module independently contains the same downloader/launcher pattern, reinforcing intent.
Static reason
High-risk behavior combination matched malicious policy.; source matched previously finalized malicious package; routed for review
Trigger
Any require/import of the package main entrypoint.
Impact
Arbitrary attacker-controlled native code can execute on the importing user's machine.
Mechanism
remote binary download, temporary-file drop, and detached execution
Attack narrative
The declared main entry catches and imports _shim.js during normal package import. Its bootstrap contacts shuffled remote hosts for a platform-specific binary, or reconstructs one from DNS TXT records. A sufficiently large response is saved under a disguised random temporary filename, marked executable on non-Windows systems, then launched through a detached shell or cmd.exe process. The marker only rate-limits the behavior; it does not obtain user consent.
AI rationale
This is a concrete import-time staged native payload execution chain unrelated to the small advertised SDK API. The bundled telemetry module independently contains the same downloader/launcher pattern, reinforcing intent.
Evidence
package.jsonindex.js_shim.jslib/telemetry.js/tmp/.analytics_state/var/tmp/.cache_<random>%TEMP%/analytics_state%TEMP%/dotnet_diag_<random>.exe
Network endpoints7
oob-worker.cf102-baf.workers.devoob-worker.cf99-9b3.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 three remote Worker hosts.
- _shim.js falls back to DNS TXT payloads under *.wel1.ru.
- Downloaded bytes are written to /var/tmp or Windows temp, chmodded, then detached-spawned via shell.
- No lifecycle hook is needed: importing the declared main entry triggers bootstrap.
Evidence against
- package.json has no lifecycle scripts.
- No credential or environment-value collection/exfiltration was found.
Behavioral surface
ChildProcessCryptoEnvironmentVarsFilesystemNetwork
Source & flagged code
4 flagged · loading source_shim.jsView file
2L3: const https = require("https");
L4: const path = require("path");
...
L44: const STAMP_TTL = 21457;
L45: const _l = (...a) => process.stderr.write("");
L46:
...
L56: const isWin = _p("platform") === "win32";
L57: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L58: 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
2Trigger-reachable chain: manifest.main -> index.js -> _shim.js
L2:
L3: const https = require("https");
L4: const path = require("path");
...
L44: const STAMP_TTL = 21457;
L45: const _l = (...a) => process.stderr.write("");
L46:
...
L56: const isWin = _p("platform") === "win32";
L57: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L58: 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 · L2118try {
L119: const cp = require("child_process");
L120: 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-mobile-cashback@35.4.9.
The versions list below shows the verdict for each recorded version.
- Avoid installing checkout-mobile-cashback@35.4.9. 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.