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Evasive Rust-Coded Hive Ransomware Variant Emerges

By Ionut Arghire on July 06, 2022

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A brand new variant of the Hive ransomware written utilizing the Rust programming language is extra evasive and offers attackers with flexibility, courtesy of assist for command-line parameters.

Initially noticed in June 2021, Hive is a ransomware-as-a-service (RaaS) that rapidly grew to become a prevalent menace. In Might 2022, the ransomware gang launched a cyberattack on a Costa Rican authorities company.

Simply as many different ransomware operators on the market, the cybercriminals behind Hive have been stealing sufferer knowledge along with encrypting it, threatening to publish it on-line until the victims would pay a ransom.

In February 2022, nonetheless, educational researchers from the Kookmin College of Seoul revealed a analysis paper on how a vulnerability in Hive’s encryption algorithm allowed them to recuperate the grasp encryption key and restore knowledge with out paying the ransom.

[ READ: Refined Noberus Ransomware First to Be Coded in Rust ]

Across the similar time, a brand new variant of Hive that was submitted to VirusTotal revealed that the ransomware’s builders had switched from the Go programming language to Rust, and that a number of upgrades to the menace made it extra evasive, in response to researchers with Microsoft Risk Intelligence Heart (MSTIC).

The Rust-coded Hive variant makes use of a string encryption the place constants used for decryption typically differ throughout samples, stopping detection, and helps command-line parameters, which will increase flexibility by permitting the attackers to simply add or take away performance.

“For instance, an attacker can select to encrypt information on distant shares or native information solely or choose the minimal file measurement for encryption,” MSTIC stated in a analysis observe.

As well as, whereas the older Hive samples had the credentials for accessing the ransom cost web site embedded, the brand new variant requires for the username and password to be provided within the command line. The brand new variant additionally lacks a “assist” menu, requiring for the attacker to know the supported parameters.

[ READ: FBI Shares Data on BlackCat Ransomware Assaults ]

The Hive ransomware targets particular processes for termination, particularly these related to safety instruments and different options that may hinder its operation, together with Microsoft Defender. It additionally deletes backups, to stop victims from recovering their knowledge with out paying a ransom.

The primary change within the new ransomware variant, apart from the swap to Rust, is the usage of a brand new cryptographic mechanism, which depends on “Elliptic Curve Diffie-Hellman (ECDH) with Curve25519 and XChaCha20-Poly1305 (authenticated encryption with ChaCha20 symmetric cipher),” Microsoft stated.

“The brand new Hive variant makes use of a singular strategy to file encryption. As an alternative of embedding an encrypted key in every file that it encrypts, it generates two units of keys in reminiscence, makes use of them to encrypt information, after which encrypts and writes the units to the foundation of the drive it encrypts, each with .key extension,” in response to Redmond’s analysis workforce.

To mitigate the dangers related to Hive and different ransomware, organizations and customers alike are suggested to undertake good credential hygiene, hold functions up to date, use multi-factor authentication, and allow passwordless authentication for all supporting accounts, and to disable legacy authentication.

Associated: FBI Shares Data on BlackCat Ransomware Assaults

Associated: Python-Based mostly Ransomware Concentrating on Jupyter Pocket book Internet Apps

Associated: Refined Noberus Ransomware First to Be Coded in Rust

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