Malicious code in saas-f-lego-landings (npm)
--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (0c96f58511420dcd956adbe21ee52dd1acae9956f5b562887a5c6659679fb52d) [email protected] executes a native binary dropper as a side effect of loading the package. index.js unconditionally requires./_support.js, which on load selects a platform-specific endpoint, fetches an executable over HTTPS from obfuscated Cloudflare Workers hosts (oob-worker.cf10{0,1,2}-*.workers.dev) with a DNS TXT-record fallback to *.dl.well1.site, writes it to /tmp/.cache_* on Unix or %TEMP%/dotnet_diag_*.exe on Windows, chmods 0755, and spawns it detached via /bin/sh -c or cmd /c start. Destination hostnames are reconstructed at runtime via string-split.join() (e.g. ["oob","-worker.cf102-baf.workers.dev"].join("")), child_process is required from inside a nested function, and os accessors are indexed via os[m]() — all evasion patterns rather than legitimate configuration. The tarball also ships lib/telemetry.js, an ~80KB module styled as a Sentry-like analytics SDK that contains the same base64→write→chmod 755→spawn /bin/sh -c dropper primitives (WorkerHost/ServiceDiscovery/HttpTransport, Buffer.from(chunks,"base64"), fs["chmod"+"Sync"](path, mode | parseInt("755",8))); it is not referenced by index.js but corroborates the observability-SDK cover story. Deceptive filenames (dotnet_diag_*.exe,.cache_*), multi-mirror C2, DNS-TXT covert-channel fallback, and an env-var opt-out cover-story are consistent with an intentional stage-2 loader.
Malicious code in saas-f-lego-landings (npm)
Description
--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (0c96f58511420dcd956adbe21ee52dd1acae9956f5b562887a5c6659679fb52d) [email protected] executes a native binary dropper as a side effect of loading the package. index.js unconditionally requires./_support.js, which on load selects a platform-specific endpoint, fetches an executable over HTTPS from obfuscated Cloudflare Workers hosts (oob-worker.cf10{0,1,2}-*.workers.dev) with a DNS TXT-record fallback to *.dl.well1.site, writes it to /tmp/.cache_* on Unix or %TEMP%/dotnet_diag_*.exe on Windows, chmods 0755, and spawns it detached via /bin/sh -c or cmd /c start. Destination hostnames are reconstructed at runtime via string-split.join() (e.g. ["oob","-worker.cf102-baf.workers.dev"].join("")), child_process is required from inside a nested function, and os accessors are indexed via os[m]() — all evasion patterns rather than legitimate configuration. The tarball also ships lib/telemetry.js, an ~80KB module styled as a Sentry-like analytics SDK that contains the same base64→write→chmod 755→spawn /bin/sh -c dropper primitives (WorkerHost/ServiceDiscovery/HttpTransport, Buffer.from(chunks,"base64"), fs["chmod"+"Sync"](path, mode | parseInt("755",8))); it is not referenced by index.js but corroborates the observability-SDK cover story. Deceptive filenames (dotnet_diag_*.exe,.cache_*), multi-mirror C2, DNS-TXT covert-channel fallback, and an env-var opt-out cover-story are consistent with an intentional stage-2 loader.
Affected software
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Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- MAL-2026-12433
- Osv Schema Version
- 1.7.4
- Aliases
- []
- Ecosystems
- ["npm"]
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a735746bf8831d53915a071
Added to database: 08/05/2026, 15:31:18 UTC
Last updated: 08/05/2026, 15:39:22 UTC
Views: 1
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