Which versions of tyepescript-core are malicious?

The following npm versions of tyepescript-core are flagged malicious: 1.0.0. Treat any of these as compromised.

How do I remediate tyepescript-core if I installed it?

tyepescript-core 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.

I already installed tyepescript-core — how do I know if it already compromised me?

If tyepescript-core was ever installed, its post-install/runtime payload may have already executed. O3's L7 egress monitoring and runtime eBPF sensors detect the credential exfiltration or command-and-control callback after install and block the malicious outbound channel, so you catch and contain the actual compromise — not just the presence of the package.

Is tyepescript-core part of a known attack campaign?

Yes — tyepescript-core is associated with the IN-MAL-2026-018184 campaign. Packages in the same campaign often share infrastructure and payloads, so check whether any related packages are also in your dependency tree.

How do I find tyepescript-core across my projects, lockfiles, and CI pipelines?

Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for tyepescript-core (version 1.0.0). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging tyepescript-core across your stack and pipelines.

Malicious package

tyepescript-corenpm

tyepescript-core is a confirmed malicious npm package (MAL-2026-14144) that opens a backdoor for remote access (malicious version 1.0.0). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in tyepescript-core (npm)

MAL-2026-14144

Immediate action

Remove the package, then rotate any secrets the build/runtime could reach.

npm uninstall tyepescript-core

What this malware does

Package name 'tyepescript-core' is a typosquat of 'typescript'; the module itself exports an empty stub. scripts/postinstall.js XOR-decodes byte arrays (key 'stf2026') to reconstruct a download URL and shell command at runtime, fetches an opaque Windows binary to %TEMP%\main.exe, and spawns it detached with stdio ignored. On WSL/virtualized-Linux hosts, a second XOR-decoded 'bridge' command is passed to child_process.exec to reach the Windows host. The same postinstall also POSTs a JSON body containing the resolved platform label to http://193.70.34.101:20099/vote, with the bare-IP host assembled at runtime from a string array to hide the literal. Result: arbitrary attacker-controlled code execution on the installer's machine at 'npm install' time, plus an install beacon to attacker infrastructure.

Malicious versions

1 flagged

1.0.0

Indicators of compromise (SHA-256)

f2ba91f9b227b017ddbfa6a908a0a8f0263292a0af2c11aeef0ccd24b2894862

Detection & response playbook

Backdoor / remote access

Find it
Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for tyepescript-core (version 1.0.0). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging tyepescript-core across your stack and pipelines.
If you installed it — respond
tyepescript-core 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.
Did it already run?
If tyepescript-core was ever installed, its post-install/runtime payload may have already executed. O3's L7 egress monitoring and runtime eBPF sensors detect the credential exfiltration or command-and-control callback after install and block the malicious outbound channel, so you catch and contain the actual compromise — not just the presence of the package.
How O3 protects you
O3 blocks tyepescript-core before install through its supply-chain scanner, and if it has already run, detects and severs the exfiltration or C2 callback at runtime through L7 egress monitoring and eBPF.

Frequently asked questions

No. tyepescript-core on npm has been identified as a malicious package (version 1.0.0 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-018184

References

npmjs.com

Credits

Amazon Inspector · finder

Detect & block this

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

Malware detection Runtime egress monitoring

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