LWA-2026-12268 MAL-2026-16323 ↗ confirmed malware

action-slack-message-root@1.0.1

Malicious code in action-slack-message-root (npm)

T1059.007 · JavaScriptT1082 · System Information DiscoveryT1041 · Exfiltration Over C2 Channel

Analysis

The package's preinstall hook runs index.js, which fingerprints the host (hostname, OS platform/arch/release, uptime, CPU count, total memory, and the output of whoami, id, pwd, and uname -a) and POSTs this data as JSON to the Burp Collaborator endpoint hxxp://x86cmb7n60gbagfm4fdws0nw5nbjzanz[.]oastify[.]com after a one-second delay. Network errors are silently ignored to keep the exfiltration quiet. The package also declares a dependency on the known-malicious package openmct-heatmap.

analyzed by
Leitwacht
first seen
Sep 19, 2026, 02:56 PM
analyzed
Sep 19, 2026, 02:56 PM

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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.