MAL-2026-17792
Dashboard / Malicious Package / MAL-2026-17792
MAL-2026-17792
Summary: Malicious code in nft-metadata-resolver (RubyGems)
Details: Source: amazon-inspector (ee87c382dfd443e81b4cf0e8dc66749f9a129bd4239f984859aaaf760e84c629) The gem ships a native-extension script at ext/nft_metadata_resolver/extconf.rb that RubyGems auto-executes during `gem install`. The script carries a base64-encoded Ruby payload, decodes it with Base64.decode64 and runs it via eval inside a double-forked, detached, delayed child process. The decoded payload opens a TCP connection to the hardcoded bare-IP endpoint 45.138.12.177:8089 and bridges /bin/sh standard I/O to that socket using IO.popen and IO.copy_stream in both directions, giving the remote endpoint an interactive shell on the installer's host. Execution is gated by sandbox-evasion checks that skip CI environments, ephemeral or sandbox hostnames, generated analyst-shaped usernames, analysis working directories, and hosts with short uptimes, firing only when developer-shaped home-directory signals are present. The gem's advertised identity is inconsistent with its contents: the package is published as nft-metadata-resolver, the README describes a 'bitcoin-rpc-lite' library, and the extension declares a makefile target named bitcoin_rpc_lite_native while shipping no native C/C++ source for a real addon build. The extconf.rb's sole purpose is to decode and execute the embedded payload. Source: ossf-package-analysis (6025ab6524365bfb72f42951bbd78d214e309ae007eae9150f11c84503c77cdf) The OpenSSF Package Analysis project identified 'nft-metadata-resolver' @ 0.9.1 (rubygems) as malicious. It is considered malicious because: - The package executes one or more commands associated with malicious behavior.
Affected packages
Package
Name: nft-metadata-resolver
Purl: pkg:gem/nft-metadata-resolver
Affected ranges
Type: N/A
Events:
