Remove obfuscated RCE payload from postcss.config.js and restore .gitignore - #7
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Remove obfuscated RCE payload from postcss.config.js and restore .gitignore#7kevpay wants to merge 1 commit into
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postcss.config.js carried an obfuscated JavaScript payload appended after the legitimate
config, hidden behind a long run of spaces on the closing line so it sits
off-screen in an editor. Restored to its pre-tampering content.
What the payload does:
- Resolves its C2 endpoint from the Ethereum blockchain (EtherHiding), reading
the host from recent transactions of a hardcoded attacker-controlled address
via public RPC endpoints and a Blockscout txlist API.
- Fetches a second stage over HTTP(S) and runs it two ways: eval() in-process,
and a detached spawn(node, ['-e', ...]) with stdio 'ignore' and windowsHide,
unref'd so it outlives the parent.
postcss.config.js executes_on_every_build_and_dev_server_start, so this ran on developer
machines and in CI.
.gitignore was rewritten by the same commit: line endings converted, the .env
entry deleted, and a config.bat entry added. Removing .env from .gitignore
stages local secrets to become committable. Restored to its pre-tampering
revision.
The payload first arrived in 7351fac_("add_cert_renew_script",_2025-01-06),_and_was_replaced_with_a_newer_variant_by_7948683_("remove_polin_rider",_2026-05-27).
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Summary
postcss.config.jscarried an obfuscated JavaScript payload appended after the config, hidden behind a long run of spaces on the closing line so it sits off-screen in an editor..gitignorewas rewritten by the same activity to delete the.enventry and addconfig.bat.What the payload does
txlistAPI.eval()in-process, and a detachedspawn(node, ['-e', ...])withstdio: 'ignore'andwindowsHide,unref()'d so it outlives the parent.postcss.config.jsexecutes on every build and dev server start.Provenance
An older payload variant arrived in
7351fac("add cert renew script", 2025-01-06) and was replaced with a newer, blockchain-C2 variant by7948683("remove polin rider", 2026-05-27) — a commit intended as a cleanup that shipped a fresh payload instead. That points at the committing machine rather than CI.Scope note
This PR cleans the current tip only; the payload remains reachable in history. Ten other org repositories carry the same campaign, and any credentials reachable from an affected machine or CI run should be treated as compromised.
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