Crypto24 Ransomware: Stealth Attacks Blending Legitimate Tools

These sources provide a detailed comparative analysis of two significant ransomware threats: Crypto24 and LockBit. The first source offers a side-by-side comparison, establishing that LockBit operates as a massive Ransomware-as-a-Service (RaaS) model with highly variable tactics due to its use of affiliates, while the newer Crypto24 is characterized as a more centralized, stealth-focused group emerging in late 2023. Both employ double extortion and use living-off-the-land (LotL) techniques alongside custom tools for evasion, but Crypto24 emphasizes targeted EDR disabling, whereas LockBit utilizes a broader range of tools and platforms due to its scale. The second source, a threat analysis from Trend Micro, focuses exclusively on Crypto24's sophisticated, multi-stage attack chain, detailing how the group targets high-profile enterprises, maintains persistence through keyloggers and legitimate tools like PsExec, and utilizes a custom tool called RealBlindingEDR to bypass security controls during off-peak hours.