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Malicious package

@bancolonbia/menu-filter-widget-webnpm

Advisory published Updated

@bancolonbia/menu-filter-widget-web is a confirmed malicious npm package (MAL-2026-5344) that steals credentials and exfiltrates sensitive data (malicious version 0.0.1). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in @bancolonbia/menu-filter-widget-web (npm)

MAL-2026-5344
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall @bancolonbia/menu-filter-widget-web

What this malware does

package.json declares scripts.postinstall: node./callback.js, which fires automatically on npm install. callback.js reads the installer's hostname and transmits it to a hardcoded Burp Collaborator domain (3y294ed4dfq501wnmdvbakcnwe25qvek.oastify.com) via two channels: an HTTPS GET to /<token>/<encodeURIComponent(host)> and a DNS lookup against a subdomain encoding the same token + hostname. The package self-describes as an "authorized security research PoC" but is published under the @bancolonbia scope (a likely typosquat of the Bancolombia corporate namespace), matching the classic dependency-confusion shape: a private-looking scoped name registered publicly so a misconfigured internal build resolves to this package and beacons victim identity to the researcher/attacker. Whether or not the operator is authorized by Bancolombia, any third party who installs this package has their hostname exfiltrated to an attacker-controlled Collaborator endpoint without consent.

The OpenSSF Package Analysis project identified '@bancolonbia/menu-filter-widget-web' @ 0.0.1 (npm) as malicious.

It is considered malicious because:

  • The package communicates with a domain associated with malicious activity.

Malicious versions

1 flagged
0.0.1

Indicators of compromise (SHA-256)

fff12ed8f9f042d996b7c1167a9987b941eedcdedd7dbc2065579c4394e5b8b6
3cca61c689abd692e18d4d07a8daed2b9e6d0b27348a20804f6422ffc1cce978
76511e7873dc4a76b8447f91807e48289877ee612cd0d94526206390bbda7f3e

Detection & response playbook

Credential / info stealer

  1. Find it

    Search your lockfiles and build artifacts for @bancolonbia/menu-filter-widget-web (version 0.0.1).

  2. If you installed it — respond

    @bancolonbia/menu-filter-widget-web is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.

  3. Did it already run?

    If @bancolonbia/menu-filter-widget-web 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. @bancolonbia/menu-filter-widget-web on npm has been identified as a malicious package (version 0.0.1 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-005240IN-MAL-2026-005239

References

Credits

  • Amazon Inspector · finder
  • OpenSSF: Package Analysis · finder

Detect & block this

O3 blocks @bancolonbia/menu-filter-widget-web-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.

Malware detection Runtime egress monitoring

Explore

All malware advisories How O3 detects malware Vulnerability database
@bancolonbia/menu-filter-widget-web (npm) malicious package — MAL-2026-5344 | O3 Security