Malicious code in checkout-post-installment-client-agreement-accept-am (npm)
--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (3562600b17ec6918b0ebfda948a4579addb4bf1d55a39c696bf6b10fcc15020f) On require(), index.js loads _support.js which assembles Cloudflare Workers hostnames (oob-worker.cf100-416.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf103-070.workers.dev) via array-join concealment and fetches a platform-specific binary over HTTPS, with a DNS-TXT base64-chunk fallback channel served from sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru and net.dl.wel1.ru. The retrieved bytes are written to a temp path with a disguised name (.cache_<rnd> on Unix, dotnet_diag_<rnd>.exe on Windows), chmod 0755'd, and detached-spawned via /bin/sh -c or cmd /c start, so the payload runs at import time with the installer's privileges. A second dropper implementation with the same fetch/write/chmod 755/spawn primitives is bundled in lib/telemetry.js under an 'Analytics SDK' cover story, using concatenated API names (chmod+Sync, child_+process) and base64 buffer decoding. Package name and 'telemetry/analytics' framing are cover-story labels; the actual behavior is remote code delivery and execution on the installer's host from author-controlled infrastructure.
Malicious code in checkout-post-installment-client-agreement-accept-am (npm)
Description
--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (3562600b17ec6918b0ebfda948a4579addb4bf1d55a39c696bf6b10fcc15020f) On require(), index.js loads _support.js which assembles Cloudflare Workers hostnames (oob-worker.cf100-416.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf103-070.workers.dev) via array-join concealment and fetches a platform-specific binary over HTTPS, with a DNS-TXT base64-chunk fallback channel served from sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru and net.dl.wel1.ru. The retrieved bytes are written to a temp path with a disguised name (.cache_<rnd> on Unix, dotnet_diag_<rnd>.exe on Windows), chmod 0755'd, and detached-spawned via /bin/sh -c or cmd /c start, so the payload runs at import time with the installer's privileges. A second dropper implementation with the same fetch/write/chmod 755/spawn primitives is bundled in lib/telemetry.js under an 'Analytics SDK' cover story, using concatenated API names (chmod+Sync, child_+process) and base64 buffer decoding. Package name and 'telemetry/analytics' framing are cover-story labels; the actual behavior is remote code delivery and execution on the installer's host from author-controlled infrastructure.
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-2026-12586
- Osv Schema Version
- 1.7.4
- Aliases
- []
- Ecosystems
- ["npm"]
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a735733bf8831d53913d0fd
Added to database: 08/05/2026, 15:30:59 UTC
Last updated: 08/05/2026, 15:30:59 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.