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Ransomware & Malware BleepingComputer 3 weeks ago

Malicious npm packages evade install-script defenses at runtime

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CyberNew Threat Research Desk
• Original Reporting: BleepingComputer
CyberNew Threat Intel Assessment
Assessed Severity: MEDIUM
Impacted Surface
Enterprise Perimeter & Network Defense
Intelligence Sector
Ransomware & Malware

Analyst Takeaway

"An ongoing npm malware campaign involving the 'indexed-btree' package shows how threat actors bypass supply chain defenses by hiding malicious code in a package's normal runtime behavior rather than in installation scripts. The package, spotted by Checkmarx researchers, attempts to impersonate the legitimate 'sorted-btree' library and has already amassed 2 million weekly downloads. The campaign..."

Recommended Defense & Mitigation

  • Threat Monitoring: Ingest published IOCs into SIEM/EDR detection rules for continuous telemetry monitoring.
  • Security Awareness: Alert staff and maintain baseline endpoint hardening across endpoints.
Curated & Verified by CyberNew Threat Intelligence Desk Standard Defense Framework (NIST / MITRE ATT&CK)

NPM

An ongoing npm malware campaign involving the 'indexed-btree' package shows how threat actors bypass supply chain defenses by hiding malicious code in a package's normal runtime behavior rather than in installation scripts.

The package, spotted by Checkmarx researchers, attempts to impersonate the legitimate 'sorted-btree' library and has already amassed 2 million weekly downloads.

The campaign may also have generated significant profits for the attackers, who, according to Checkmarx, use a wallet holding 109 ETH. However, the report does not say those funds came from cryptocurrency theft.

Bypassing latest security measures

In June 2026, GitHub announced a set of npm security measures designed to help prevent supply chain attacks that have shaken open-source ecosystems repeatedly since late 2025.

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Source Verification & Original Intelligence

This threat report was reviewed by CyberNew analysts and cross-referenced with primary security disclosures from BleepingComputer.

Primary Advisory →