Remove obfuscated RCE payload from postcss.config.js and restore .gitignore - #1
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Remove obfuscated RCE payload from postcss.config.js and restore .gitignore#1kevpay 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 0e5eedc_(2025-04-15),_and_was_replaced_with_a_newer_variant_by_8ed3af6_("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
1rpc.io,ethereum-rpc.publicnode.com,eth.drpc.org,public.blastapi.io) and a BlockscouttxlistAPI.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 — worth a close look
This repo shows the campaign most clearly. An older payload variant arrived in
0e5eedc(2025-04-15). Commit8ed3af6, titled "remove Polin Rider" (2026-05-27), did not remove it — the file goes into that commit carrying the old variant and comes out carrying a newer variant with blockchain-based C2. The cleanup intent was real; the payload was rewritten into the file at commit time.That points at the committing machine rather than CI, and it means file-level cleanup alone will not hold until that machine is dealt with.
Scope note
This PR cleans the current tip only; the payload remains reachable in history. Ten other org repositories carry the same campaign. Any credentials reachable from an affected machine or CI run should be treated as compromised.
Generated by Claude Code