LWA-2026-11340 confirmed malware
chalk-lib@1.0.0
Malicious code in chalk-lib (npm)
T1195.002 · Compromise Software Supply ChainT1059 · Command and Scripting InterpreterT1059.007 · JavaScriptT1105 · Ingress Tool TransferT1071 · Application Layer ProtocolT1082 · System Information Discovery
Analysis
The postinstall hook of chalk-lib@1.0.0 (scripts/postinstall.js) is a dropper. It XOR-decodes an obfuscated URL and downloads a Windows executable (main.exe) from github[.]com/bebriz1/qPzM50V1aKG0rVlH/release/download/nqll/main.exe into %TEMP%, then executes it detached. On WSL/virtualized-Linux hosts it runs the same download-and-execute via a shell bridge command. It also POSTs host platform telemetry to 193[.]70[.]34[.]101:20099/vote. All network destinations are XOR-obfuscated in the script.
- analyzed by
- Leitwacht
- first seen
- Aug 16, 2026, 02:48 AM
- analyzed
- Aug 16, 2026, 02:49 AM
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Independently detected by the Leitwacht supply-chain probe. IOCs are defanged. Published CC0. Think this is a mistake? See the dispute policy.