RansomExx Upgrades to Rust

Overall, the functionality of this ransomware variant is very similar to previous RansomExx Linux variants.

The ransomware expects to receive a list of directory paths to encrypt as input. If no arguments are passed to it, then it does not encrypt anything. The following command line format is required by the ransomware in order to execute correctly.

-do [ (optional)]

Upon execution, the ransomware iterates through the specified directories, enumerating and encrypting files. All files greater than or equal to 40 bytes are encrypted, with the exception of the ransom notes and any previously encrypted files.

Each encrypted file is given a new file extension. It is common for RansomExx ransomware file extensions to be based on a variation of the target company name, sometimes followed by the numbers such as ‘911’ or random characters.

A ransom note is dropped in each directory where file encryption occurs.

Files are encrypted using AES-256 and a randomly generated key. The AES key is itself encrypted using RSA and a hardcoded public key, and appended to the end of the encrypted file. As a result of this encryption method, the corresponding RSA private key, held by the attacker, would be required to decrypt the files.
Elements such as RSA key, file extension, and the ransomware note name and contents, are encrypted within the binary and decrypted by xoring the encrypted data with an equal-sized key.

Sign Up For Threat Alerts

Loading...
Threats Icon

Jul 04, 2023

Rhysida Ransomware RaaS Crawls Out of Crimeware...

The Rhysida ransomware-as-a-service (RaaS) group has gone from a dubious newcomer to a fully-fledged ransomware...

Threats Icon

Jun 26, 2023

Operation Magalenha – Long-Running Campaign Pursues Portuguese...

The attackers can steal credentials and exfiltrate users' data and personal information, which can be...

Threats Icon

Apr 24, 2023

Lazarus Group Adds Linux Malware to Arsenal...

Researchers have discovered a new campaign conducted by Lazarus, known as "Operation DreamJob," which targets...

Threats Icon

Apr 23, 2023

Additional IOCs for 3cx breach

Recently an unexpected malicious activity emanating from a legitimate, signed binary, 3CXDesktopApp was observed.

Threats Icon

Apr 23, 2023

Ex-Conti and FIN7 Actors Collaborate with New...

IBM Security X-Force recently discovered a new malware family Analysts have called "Domino," which Analysts...

Threats Icon

Apr 20, 2023

AuKill EDR killer malware abuses Process Explorer...

The AuKill tool abuses an outdated version of the driver used by version 16.32 of...

Threats Icon

Apr 20, 2023

Fake Chrome updates spread malware

A campaign running since the end of last year is using hacked sites to push...

Threats Icon

Apr 20, 2023

QBot using new attack vector in its...

QBot, also known as QakBot, previously operated as a banking trojan and has since transformed...

Threats Icon

Apr 20, 2023

CrossLock Ransomware Emerges: New Golang – Based...

The CrossLock ransomware employs the double extortion technique to increase the likelihood of payment from...

Threats Icon

Apr 20, 2023

Windows Zero-Day Vulnerability CVE-2023-28252 Exploited by Nokoyawa...

A zero-day vulnerability in the Microsoft Windows system, which also affects Windows 11, has been...

Threats Icon

Apr 18, 2023

Additional IOcs for 3cx breach

Recently an unexpected malicious activity emanating from a legitimate, signed binary, 3CXDesktopApp was observed. As...

Threats Icon

Apr 18, 2023

Additional IOcs for 3cx breach

Recently an unexpected malicious activity emanating from a legitimate, signed binary, 3CXDesktopApp was observed. As...

Threats Icon

Apr 18, 2023

APT36 Expands Interest Within Indian Education Sector

Symantec described UPS in 2016 report as Buckeye (also known as APT3 Gothic Panda UPS...

Threats Icon

Apr 17, 2023

ChinaZ DDoS Bot Malware Distributed To Linux...

The ChinaZ DDoS bot malware was discovered targeting Linux systems while a version for Microsoft...

Threats Icon

Apr 16, 2023

Resurgence Of The Mexals Cryptojacking Campaign

The Mexals crypto jacking campaign has been in operation since at least 2021 and continues...