{"items":[{"id":"NVI-00010818","kind":"supply_chain_event","title":"Malicious code in tx-broadcast-utils (RubyGems)","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-m56c-f68h-prj5"],"plain_summary":"GitHub lists this malware advisory for tx-broadcast-utils. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-186b8f63a310d9e14c9af213a985f664"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-186b8f63a310d9e14c9af213a985f664","url":"https://github.com/advisories/GHSA-m56c-f68h-prj5","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-m56c-f68h-prj5","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T23:13:05.881Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-186b8f63a310d9e14c9af213a985f664"],"technology":"tx-broadcast-utils","known_exclusions":[],"conditions_summary":"## Source: amazon-inspector (60efdf159c3ce8550c985b3f19cbe72f2bfcae0266cb63fb8c0dd458b56b9901)\nThe gem's native-extension script (ext/.../extconf.rb) embeds a base64-encoded Ruby payload that is eval'd at `gem install` time. The payload double-forks and detaches a background process which sleeps 20-40 minutes, reconstructs a C2 URL by XOR-decoding a hex blob to http://45.138.17.70:809/wgkit.tar.gz, downloads the tarball to /tmp/.w1.tgz, extracts it to /tmp/.w1, and executes wg_install.sh as the installing user. Execution is gated on anti-analysis checks that suppress the payload in CI, ephemeral/sandbox hostnames, generated usernames matching /uA\\d+/, paths under /tmp or /opt/rubygems, and hosts with short uptime, and requires developer-machine signals such as ~/.ssh, ~/.gitconfig, and ~/.gem/credentials before firing. The advertised purpose (Bitcoin transaction broadcast helpers over public esplora endpoints) is a decoy: the shipped library only exposes a truncated BIP39 word list with no broadcast code, and the native extension's C source is an empty Init_ stub. The extconf.rb dropper is the gem's only functional component.\n\n---\n\nCredit: [OpenSSF](https://github.com/ossf/maliciou","public_affected_ranges":["= 1.0.0"]}],"null_published_at":"2026-10-31T23:18:22.389Z","source_updated_at":"2026-10-06T00:33:04.000Z","source_disclosed_at":"2026-10-05T18:34:14.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-10-31T23:13:05.881Z"}],"next_cursor":null,"snapshot_revision":"42594"}