Avast researchers found a security flaw in the DoNex ransomware and its previous versions, which allowed them to create a tool to decrypt the files. They shared this discovery at the Recon 2024 conference. Avast released a free decryptor in March 2024 to help victims recover their files.
“All brands of the DoNex ransomware are supported by the decryptor.” reads the announcement. “DoNex uses targeted attacks on its victims and it was most active in the US, Italy, and Belgium based on our telemetry.”
By F2
/ Tuesday , June 24 2025
The U.S. House of Representatives has banned congressional staff from using WhatsApp on government devices due to security concerns, as...
Read More
By F2
/ Tuesday , June 24 2025
Kaspersky found a new mobile malware dubbed SparkKitty in Google Play and Apple App Store apps, targeting Android and iOS....
Read More
By F2
/ Tuesday , June 24 2025
OWASP has released its AI Testing Guide, a framework to help organizations find and fix vulnerabilities specific to AI systems....
Read More
By F2
/ Tuesday , June 24 2025
In a major milestone for the country’s digital infrastructure, Axentec PLC has officially launched Axentec Cloud, Bangladesh’s first Tier-4 cloud...
Read More
By infosecbulletin
/ Monday , June 23 2025
A hacking group reportedly linked to Russian government has been discovered using a new phishing method that bypasses two-factor authentication...
Read More
By infosecbulletin
/ Wednesday , June 18 2025
Russian cybersecurity experts discovered the first local data theft attacks using a modified version of legitimate near field communication (NFC)...
Read More
By infosecbulletin
/ Tuesday , June 17 2025
Cybersecurity researcher Jeremiah Fowler discovered an unsecured database with 170,360 records belonging to a real estate company. It contained personal...
Read More
By infosecbulletin
/ Tuesday , June 17 2025
GreyNoise found attempts to exploit CVE-2023-28771, a vulnerability in Zyxel's IKE affecting UDP port 500. The attack centers around CVE-2023-28771,...
Read More
By infosecbulletin
/ Tuesday , June 17 2025
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has recently included two high-risk vulnerabilities in its Known Exploited Vulnerabilities (KEV)...
Read More
By infosecbulletin
/ Monday , June 16 2025
SafetyDetectives’ Cybersecurity Team discovered a public post on a clear web forum in which a threat actor claimed to have...
Read More
The company has been working with the police to secretly give victims a tool to unlock their data and prevent the ransomware author from learning how it was created.
DoNex is a new version of Muse and DarkRace ransomware. It was first seen in April 2022.
When running, CryptGenRandom() creates an encryption key. The harmful code then uses the key to start the ChaCha20 symmetric key and encrypt files. After encrypting a file, the symmetric file key is encrypted with RSA-4096 and added to the end of the file. Files are chosen by their extension, and the extensions are listed in the ransomware XML config.
The ransomware encrypts small files completely. For files larger than 1MB, it uses intermittent encryption by splitting the files into separate blocks that are encrypted individually.
DoNex ransomware and its previous versions have XOR-encrypted configurations that include settings for whitelisted extensions, files, services to kill, and other encryption-related data.
The researchers suggest using the 64-bit version for better performance, as it requires a lot of memory for the password-cracking process. Experts advise making a backup of encrypted files before using the decryption tool, in case something goes wrong. The researchers also provided Indicators of Compromise (IOCs) for this threat.