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Malicious package

bianira-uinpm

Advisory published Updated

bianira-ui is a confirmed malicious npm package (MAL-2026-11132) that opens a backdoor for remote access (malicious version 1.27.0). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in bianira-ui (npm)

MAL-2026-11132
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall bianira-ui

What this malware does

plugin.js (the package main) contains an appended top-level IIFE that runs on any require/import of the package. Every network-related identifier (http/https/child_process, URL, RPC method names, C2 host, attacker address, request paths) is written as \uXXXX unicode escapes to evade static inspection. The payload queries Ethereum RPC endpoint eth.drpc.org for the latest transaction sent by hardcoded address 0xa322e5f3d311d3080e6f0121063e9adc2490ef1a, derives a C2 IP from the first 4 bytes of that transaction's to field (blockchain dead-drop C2 resolution), then fetches two XOR-encrypted payloads over plain HTTP from paths /0x/cls and /0x/ls on the derived host. The first payload is passed to eval(); the second is executed by spawning node -e with the decoded content as the argument. This yields full remote code execution on any machine that installs and imports the package, with the C2 endpoint dynamically rotatable by the attacker through new Ethereum transactions.

Malicious versions

1 flagged
1.27.0

Indicators of compromise (SHA-256)

a775549df738e414db9982a4695da893427c09ccc63cd520917c1b73476f4336

Detection & response playbook

Backdoor / remote access
  1. Find it

    Search your lockfiles and build artifacts for bianira-ui (version 1.27.0).

  2. If you installed it — respond

    bianira-ui establishes remote access, so treat any host that installed it as fully compromised. Isolate the machine, remove the package, rotate all credentials it could reach, and rebuild from a trusted image rather than cleaning in place — a backdoor may have planted additional persistence.

  3. Did it already run?

    If bianira-ui was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.

Frequently asked questions

No. bianira-ui on npm has been identified as a malicious package (version 1.27.0 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-010954

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks bianira-ui-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the C2 callback and severs the channel.

Explore

bianira-ui (npm) malicious package — MAL-2026-11132 | O3 Security