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Malicious code in claims-use-base-analytics (npm)

0
Unknown
Published: 08/05/2026 (08/05/2026, 13:59:46 UTC)
Source: GCVE Database
Product: claims-use-base-analytics

Description

--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (0f191811e6841cbfe4cc2c9621f7876290b92efc2bdc78e9c4f6c4cca7933c0f) [email protected] is a native-binary dropper disguised as an analytics wrapper. On require, index.js loads _shim.js which selects a platform-specific asset path and fetches an opaque binary via HTTPS from one of three attacker-controlled Cloudflare Workers hosts (oob-worker.cf100-416.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf103-070.workers.dev). The binary is written to /tmp or %TEMP% under a disguised name (e.g. dotnet_diag_<rnd>.exe on Windows,.cache_<rnd> on Unix), chmod 0755, and spawned detached via /bin/sh -c or cmd /c start /b. If the HTTPS fetch fails, loadViaDns() reassembles a base64-encoded payload from TXT records under per-platform subdomains of dl.wel1.ru (sdk., ext., pkg., net.) — a DNS-over-TXT covert channel designed to bypass HTTP egress filtering — then writes, chmods, and executes the resulting bytes. C2 hostnames are string-split-obfuscated (e.g. ["oob-worker.cf100-416.w","orke","rs",".dev"].join("")) and require("child_" + "process") is used to evade static analysis. Execution is gated by a ~6h TTL cache stamp in.analytics_state so it fires at most once per interval, and DISABLE_TELEMETRY / DO_NOT_TRACK env vars are honored as cover for an ostensibly benign analytics stub. The package's advertised purpose (analytics wrapper) has no legitimate need for a native-binary dropper, a covert DNS-TXT fallback, or hostname obfuscation.

Affected software

npmghsa
claims-use-base-analytics
Affected versions
=35.4.9

Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.

Technical Details

Gcve Source
db.gcve.eu
Osv Id
MAL-2026-12646
Osv Schema Version
1.7.4
Aliases
[]
Ecosystems
["npm"]
Database Specific Severity
null
Cvss Version
null

Threat ID: 6a735735bf8831d539141e41

Added to database: 08/05/2026, 15:31:01 UTC

Last updated: 08/05/2026, 15:39:18 UTC

Views: 1

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