ransomware-as-a-service Archives

Tech Optimizer

March 31, 2025

Ransomware crews add EDR killers to their arsenal

Antivirus and endpoint security tools are increasingly challenged by ransomware groups that use sophisticated strategies to disable defenses early in attacks. Cisco Talos reported that in nearly half of the ransomware incidents they handled in 2024, attackers successfully employed "EDR killers" to neutralize endpoint detection and response (EDR) systems, achieving success 48 percent of the time. Tools such as EDRSilencer, EDRSandblast, EDRKillShifter, and Terminator pose significant threats to organizational security. EDRKillShifter exploits vulnerable drivers on Windows machines to terminate EDR products, a tactic observed in operations by rival gangs like Medusa, BianLian, and Play. The primary goal of these tools is to disable EDR protections, allowing attackers to operate undetected, complicating system recovery efforts. Recovery often requires wiping and rebuilding entire networks if robust backups are available. Some EDR killers, like HRSword, are legitimate software tools misused by ransomware actors to disable endpoint protection systems. Attackers have exploited misconfigured systems, particularly EDR products set to audit-only mode, which detect but do not block malicious activity. LockBit has remained the most active ransomware-as-a-service group for the third consecutive year, accounting for 16 percent of claimed attacks in 2024. Newcomer RansomHub secured the second position with 11 percent of posts to leak sites. The effectiveness of law enforcement actions plays a significant role in shaping the ransomware landscape.

Tech Optimizer

February 23, 2025

Top 10 Best Ransomware Protection Tools

Ransomware is a type of malicious software that encrypts files, making them inaccessible until a ransom is paid, usually in cryptocurrency. Ransom demands can range from a few hundred to several thousand dollars, causing significant disruptions and financial losses. Key examples of ransomware include WannaCry, Petya, CryptoLocker, Ryuk, REvil, and Snake. To protect against ransomware, it is crucial to keep software updated, use anti-virus solutions, be cautious with unknown attachments or links, and regularly back up important data. Effective protection tools include backup solutions, anti-virus software, firewalls, and ransomware-specific solutions. Free protection options include Windows Defender, Malwarebytes Anti-Ransomware, Bitdefender Anti-Ransomware, Avast Anti-Ransomware, and Kaspersky Anti-Ransomware Tool for Business. Ransomware can be categorized into locker ransomware, screen ransomware, and encrypting ransomware.

Tech Optimizer

February 23, 2025

Week in review: PostgreSQL 0-day exploited in US Treasury hack, top OSINT books to learn from

Researchers from Rapid7 disclosed that the breach of US Treasury workstations by suspected Chinese state-sponsored hackers was facilitated by two zero-day vulnerabilities, including a PostgreSQL flaw (CVE-2025-1094). Exploitation attempts targeting Palo Alto Networks firewalls have surged, focusing on CVE-2025-0108, an authentication bypass vulnerability. Apiiro security researchers introduced PRevent, an open-source tool to detect malicious code in pull requests, and Kunai, an open-source threat hunting tool for Linux, was also introduced. Chester Wisniewski from Sophos discussed the shifting ransomware landscape and quantum decryption threats, while Juliette Hudson from CybaVerse emphasized the importance of asset visibility in cybersecurity. The resurgence of BlackLock ransomware is anticipated in 2025, and XCSSET info-stealing malware has been observed targeting macOS users. Cybersecurity professionals are advised to consider the increasing use of artificial intelligence by malicious actors when making investment decisions for 2025. Various cybersecurity roles are currently available globally, reflecting the growing demand for expertise. New information security products were introduced by companies including 1Password, Fortinet, Pangea, Privacera, and Veeam Software.

Winsage

July 17, 2024

Security End-Run: ‘AuKill’ Shuts Down Windows-Reliant EDR Processes

FIN7 developed AuKill, an anti-security tool designed to undermine endpoint security, which has been used by ransomware groups in their attacks. AuKill targets protected processes monitored by EDR solutions using time-travel debugging and Process Explorer drivers, causing crashes in targeted systems. Organizations are advised to strengthen their security solutions with anti-tampering protections to defend against kernel-mode attacks.

Winsage

July 10, 2024

Eldorado Ransomware Strikes Windows and Linux Networks

Eldorado ransomware is a sophisticated Ransomware-as-a-Service (RaaS) that targets both Windows and Linux operating systems using advanced encryption techniques such as Chacha20 and RSA-OAEP. The malware has the ability to spread through shared networks and infect removable media like USB drives. Affiliates recruited by cyber-criminals through underground forums can customize attacks to specific target networks or organizations. As of June 2024, Eldorado has targeted numerous companies across various industries worldwide. Implementing multi-factor authentication, endpoint detection and response solutions, regular data backups, timely patching, and continuous employee training is crucial to defend against ransomware attacks.

Winsage

July 9, 2024

Eldorado ransomware campaign found targeting Windows and Linux systems alike

Eldorado is a new player in the ransomware-as-a-service scene, quickly demonstrating its capability to cause significant damage to victims.