Findings

MAL-2026-17766

Malicious code in @s4yhiitestpoc/scan-https-d (npm)

Published Oct 11, 2026 · updated Oct 13, 2026

Dependency-confusion proof-of-concept package. A postinstall script runs automatically on installation and sends host and user identifiers (hostname, username, home directory, network interface addresses, platform details and npm configuration) to collector.oob.s4yhii.com, with a secondary DNS lookup under oob.s4yhii.com. The script states it is bug-bounty research and does not read secrets or file contents. Any machine that installed this package disclosed the listed host information to a third party. --- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (1a1dd63de3f5e380c573cd6bcf885c9d0c7a5c503959dfde1a6c8b963a6ddaea) On , postinstall.js collects installer host identity — os.hostname(), os.userInfo().username, home directory, cwd, non-internal network interface addresses, DNS servers, and platform/arch/release — and POSTs it as JSON over HTTPS to the hardcoded endpoint https://collector.oob.s4yhii.com/_npm-poc/beacon, with a secondary DNS lookup against *.oob.s4yhii.com as an out-of-band execution signal. The package's scope ( ) and metadata self-describe this as a dependency-confusion proof-of-concept targeting internal namespaces that resolve to the public registry; the self-labeling does not change the fact that installer host identifiers leave the installer's machine on install to a hardcoded third-party domain the installer did not opt into.