Malicious code in sme-rko-finance-front-operations-overnight (npm)
The npm package sme-rko-finance-front-operations-overnight contains malicious code that downloads and executes attacker-controlled binaries from Cloudflare Workers hosts on package require. The payload uses obfuscation techniques to evade static analysis and includes environment-based gating to reduce detection.
- Disclosed
- Last updated
- Blast radius
- Any application that installed sme-rko-finance-front-operations-overnight; execution occurs on require with no user interaction required.
- Ecosystems
- Attack vectors
- Affected entities
- sme-rko-finance-front-operations-overnightnpm package containing malicious code in _ext.js and lib/telemetry.js
The npm package sme-rko-finance-front-operations-overnight was found to contain malicious code in its ext.js and lib/telemetry.js files. On require, the package fetches platform-specific opaque binaries from attacker-controlled Cloudflare Workers hosts (oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf103-070.workers.dev) with a DNS-TXT chunked-base64 fallback via *.dl.wel1.ru.\n\nThe fetched binaries are written to temporary directories (/var/tmp or %TEMP%) under disguised names (.cache, dotnet_diag_.exe), made executable, and spawned detached via shell commands with stdio redirected to /dev/null. The malicious code uses runtime string assembly to obfuscate dangerous API calls and host names, evading static analysis tools.\n\nExecution is gated by a timestamp file at /tmp/.analytics_state and environment variable checks (DISABLE_TELEMETRY, ANALYTICS_OPT_OUT, DO_NOT_TRACK) to limit repeat execution and reduce sandbox detection. The same dropper logic is duplicated in the main entry point under an 'Analytics SDK' cover story, ensuring payload execution even if _ext.js is removed.\n\nNo cryptographic protections (hash pinning, signature verification, or version pinning) are present; the delivered bytes are entirely attacker-controlled.
Indicators of compromise
- Packages
- sme-rko-finance-front-operations-overnight
- Domains
- oob-worker.cf100-416.workers.dev
- oob-worker.cf101-adf.workers.dev
- oob-worker.cf102-baf.workers.dev
- oob-worker.cf103-070.workers.dev
- dl.wel1.ru
Remediation
- Immediately uninstall sme-rko-finance-front-operations-overnight from all systems
- Audit all systems that installed this package for unauthorized processes or binaries in /var/tmp, %TEMP%, and other temporary directories
- Review process execution logs for spawned child processes from Node.js
- Block outbound connections to oob-worker.cf*.workers.dev and *.dl.wel1.ru at the network level
- Regenerate any credentials or secrets that may have been exposed on affected systems
- Monitor for indicators of compromise including unexpected network connections and temporary file creation
Sources
- GitHub Advisory GHSA-c9vg-pfhf-qxw9 · GitHub Advisory Database
Cite this entry
"Malicious code in sme-rko-finance-front-operations-overnight (npm)." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed August 8, 2026; last updated August 8, 2026. https://supplychainattack.org/incident/malicious-code-in-sme-rko-finance-front-operations-overnight-npm-1seabm
Suggest a correction
Found an error or have a newer source? Corrections to factual errors take priority over new entries.
Related incidents
- resolvedcritical
Malicious code in rust-testing-utils (npm)
The npm package rust-testing-utils contained malicious code that impersonates the pino logger and executes remotely-fetched code with arbitrary privileges. The package spawns a child process that decodes a hardcoded URL, fetches attacker-controlled content, and executes it via Function constructor with full module-loading capability.
npmCompromised packageMalicious commit - containedcritical
Malicious code in stillm4ddpocs-demo-sprocket (npm)
The npm package stillm4ddpocs-demo-sprocket version 999.9.12 contains malicious code that exfiltrates system and project metadata via multiple channels (HTTPS, HTTP, and DNS) to a hardcoded callback host. The package uses a high version number to exploit dependency-confusion attacks against organizations with internal packages of the same name.
npmCompromised packageDependency confusion - containedcritical
Malicious code in @syncraft-labs/react (npm)
The npm package @syncraft-labs/react contained obfuscated malicious code in its ESM distribution that implements the EtherHiding pattern, fetching and executing arbitrary code from an Ethereum smart contract via RPC endpoints. The tampering occurred post-build in the dist/index.js artifact.
npmCompromised package - containedcritical
Malware in hydration-dim-kit
Malware was discovered in the npm package hydration-dim-kit. Any computer with this package installed or running should be considered fully compromised. All secrets and keys must be rotated immediately from a different computer.
npmCompromised package