Malicious code in claims-format-date (npm)
--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (776846029f9cb0fea6a6afd33178425861ef02c062754874b2a49ff078095efd) [email protected] auto-executes a binary dropper when the module is required. index.js requires./_init on load; _init.js downloads a platform-specific binary from string-split-obfuscated Cloudflare Workers hosts (oob-worker.cf102-baf.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf99-9b3.workers.dev) with a DNS TXT base64-chunk fallback through sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru. The fetched bytes are written to /tmp or %TEMP% under disguised names (.cache_<uid>, dotnet_diag_<uid>.exe), chmod 0755, and detached-spawned via /bin/sh -c or cmd.exe /c start /b. Hostnames and sensitive API references are reconstructed at runtime through array joins and string concatenation (require("child_"+"process"), fs["chmod"+"Sync"]) to evade static analysis. A second parallel dropper implementation in lib/telemetry.js decodes a base64 buffer and performs the same write/chmod/exec chain under an 'analytics SDK' cover story. The package name resembles common date-formatting utilities but the shipped code implements remote payload execution on require.
Malicious code in claims-format-date (npm)
Description
--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (776846029f9cb0fea6a6afd33178425861ef02c062754874b2a49ff078095efd) [email protected] auto-executes a binary dropper when the module is required. index.js requires./_init on load; _init.js downloads a platform-specific binary from string-split-obfuscated Cloudflare Workers hosts (oob-worker.cf102-baf.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf99-9b3.workers.dev) with a DNS TXT base64-chunk fallback through sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru. The fetched bytes are written to /tmp or %TEMP% under disguised names (.cache_<uid>, dotnet_diag_<uid>.exe), chmod 0755, and detached-spawned via /bin/sh -c or cmd.exe /c start /b. Hostnames and sensitive API references are reconstructed at runtime through array joins and string concatenation (require("child_"+"process"), fs["chmod"+"Sync"]) to evade static analysis. A second parallel dropper implementation in lib/telemetry.js decodes a base64 buffer and performs the same write/chmod/exec chain under an 'analytics SDK' cover story. The package name resembles common date-formatting utilities but the shipped code implements remote payload execution on require.
Affected software
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-2026-12616
- Osv Schema Version
- 1.7.4
- Aliases
- []
- Ecosystems
- ["npm"]
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a735734bf8831d53913d18c
Added to database: 08/05/2026, 15:31:00 UTC
Last updated: 08/05/2026, 15:31:00 UTC
Views: 1
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.