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US: North Korean Hackers Concentrating on Healthcare Sector With Maui Ransomware

By Ionut Arghire on July 07, 2022

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US authorities businesses this week issued a joint advisory to warn of North Korean menace actors utilizing the Maui ransomware in assaults focusing on the healthcare and public well being sector.

Since Could 2021, North Korean government-backed menace actors have been utilizing Maui ransomware to disrupt healthcare companies corresponding to diagnostics, digital well being information, imaging, and intranet companies, reads the joint advisory from the Federal Bureau of Investigation (FBI), the Cybersecurity and Infrastructure Safety Company (CISA), and the Division of the Treasury.

Maui ransomware makes use of a mixture of AES, RSA, and XOR for the encryption course of: information are encrypted with AES utilizing a singular key that’s then encrypted utilizing a RSA key-pair generated when Maui first runs, and the RSA public key’s then encrypted utilizing a hard-coded RSA public key.

“Throughout encryption, Maui creates a brief file for every file it encrypts utilizing GetTempFileNameW(). Maui makes use of the short-term to stage output from encryption. After encrypting information, Maui creates maui.log, which comprises output from Maui execution. Actors doubtless exfiltrate maui.log and decrypt the file utilizing related decryption instruments,” the advisory reads.

In response to safety researchers at menace looking agency Stairwell, Maui is probably going operated manually, because it lacks a number of the key options sometimes utilized by ransomware-as-a-service (RaaS) households. This permits the attackers to pick which information to encrypt, in addition to to exfiltrate the ensuing runtime artifacts.

The businesses say the assaults coming from theNorth Korean state-sponsored menace actors behind the Maui ransomware assaults are prone to proceed.

“The North Korean state-sponsored cyber actors doubtless assume healthcare organizations are prepared to pay ransoms as a result of these organizations present companies which can be essential to human life and well being. Due to this assumption, the FBI, CISA, and Treasury assess North Korean state-sponsored actors are prone to proceed focusing on HPH Sector organizations,” the joint advisory reads.

The three US businesses urge organizations within the healthcare sector to mitigate the menace posed by Maui and different ransomware households on the market by making use of the precept of least privilege, disabling unused community protocols, securing and encrypting private and well being info, implementing multi-layer community segmentation, and repeatedly monitoring their environments for anomalous habits.

They need to additionally preserve offline, encrypted backups of all knowledge, ought to create and preserve a primary cyber incident response plan, preserve all of their purposes and programs up to date always, implement multi-factor authentication, require administrative privileges for putting in software program, and set up and preserve an antimalware resolution.

Simply final week, the North Korea-linked Lazarus hacking group was suspected to be behind a $100 million crypto hack of Concord’s Horizon Bridge, primarily based on knowledge and analysis from blockchain analytics agency Elliptic.

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