Malicious code in claims-to-iso-string-with-timezone (npm)
--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (c313bb681d365fedf6993c01c72c1e6e703b2b5124c8c35c19a730d5b2d4f7aa) On require of claims-to-iso-string-with-timezone, index.js loads./_init.js which downloads a platform-specific binary from obfuscated author-controlled endpoints (Cloudflare Workers hostnames oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf102-baf.workers.dev with a DNS-TXT fallback to sdk.dl.wel1.ru) reconstructed from string-array joins, writes it to /tmp/.cache_<rand> or %TEMP%\dotnet_diag_<rnd>.exe, chmods it 0755, and spawns it detached via cp.spawn("/bin/sh", ["-c", fp + " &"]) or spawn("cmd",...). The package advertises itself as a date/timezone formatting utility with no declared dependencies; the dropper require is wrapped in a try/catch to swallow errors, and the dropped binary is named to impersonate dotnet diagnostic tooling. The package name resembles a legitimate date-formatting utility, and the harmful behavior is isolated in _init.js loaded by index.js.
Malicious code in claims-to-iso-string-with-timezone (npm)
Description
--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (c313bb681d365fedf6993c01c72c1e6e703b2b5124c8c35c19a730d5b2d4f7aa) On require of claims-to-iso-string-with-timezone, index.js loads./_init.js which downloads a platform-specific binary from obfuscated author-controlled endpoints (Cloudflare Workers hostnames oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf102-baf.workers.dev with a DNS-TXT fallback to sdk.dl.wel1.ru) reconstructed from string-array joins, writes it to /tmp/.cache_<rand> or %TEMP%\dotnet_diag_<rnd>.exe, chmods it 0755, and spawns it detached via cp.spawn("/bin/sh", ["-c", fp + " &"]) or spawn("cmd",...). The package advertises itself as a date/timezone formatting utility with no declared dependencies; the dropper require is wrapped in a try/catch to swallow errors, and the dropped binary is named to impersonate dotnet diagnostic tooling. The package name resembles a legitimate date-formatting utility, and the harmful behavior is isolated in _init.js loaded by index.js.
Affected software
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Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- MAL-2026-12644
- Osv Schema Version
- 1.7.4
- Aliases
- []
- Ecosystems
- ["npm"]
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a735735bf8831d53913f939
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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