Malicious code in claims-policy-details-domain (npm)
--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (ddd2a9e4dd34aac1232648e9e5f459331bd73d0f3779ed68ac559d8f4692c9bb) On require() of claims-policy-details-domain, index.js loads _vendor.js which downloads a platform-specific binary from anonymous Cloudflare workers.dev subdomains (oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf103-070.workers.dev), with a DNS TXT covert-channel fallback under *.dl.wel1.ru (sdk./ext./pkg./net.dl.wel1.ru) that retrieves base64-chunked payload bytes via resolveTxt of c.<domain> and <N>.<domain>. The fetched bytes are written to disguised paths in /var/tmp or %TEMP% (e.g..cache_<hex>, dotnet_diag_<hex>.exe), chmod 0o755, and spawned detached via /bin/sh -c or cmd.exe /c start /b (_vendor.js line 119, 121, 125). C2 hostnames are assembled from split string fragments to evade static analysis, and generic opt-out env vars plus a TTL cache reduce re-execution and observability. The package presents as an internal-namespace SDK at an unusually high version (35.9.3) with a trivial declared surface and an 81KB stub lib/telemetry.js, consistent with a dependency-confusion lure whose only material behavior is the dropper.
Malicious code in claims-policy-details-domain (npm)
Description
--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (ddd2a9e4dd34aac1232648e9e5f459331bd73d0f3779ed68ac559d8f4692c9bb) On require() of claims-policy-details-domain, index.js loads _vendor.js which downloads a platform-specific binary from anonymous Cloudflare workers.dev subdomains (oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf103-070.workers.dev), with a DNS TXT covert-channel fallback under *.dl.wel1.ru (sdk./ext./pkg./net.dl.wel1.ru) that retrieves base64-chunked payload bytes via resolveTxt of c.<domain> and <N>.<domain>. The fetched bytes are written to disguised paths in /var/tmp or %TEMP% (e.g..cache_<hex>, dotnet_diag_<hex>.exe), chmod 0o755, and spawned detached via /bin/sh -c or cmd.exe /c start /b (_vendor.js line 119, 121, 125). C2 hostnames are assembled from split string fragments to evade static analysis, and generic opt-out env vars plus a TTL cache reduce re-execution and observability. The package presents as an internal-namespace SDK at an unusually high version (35.9.3) with a trivial declared surface and an 81KB stub lib/telemetry.js, consistent with a dependency-confusion lure whose only material behavior is the dropper.
Affected software
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Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- MAL-2026-12640
- Osv Schema Version
- 1.7.4
- Aliases
- []
- Ecosystems
- ["npm"]
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a735735bf8831d53913f951
Added to database: 08/05/2026, 15:31:01 UTC
Last updated: 08/05/2026, 15:31:01 UTC
Views: 1
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