Open-source AdaptixC2 hacking tool has fans in Russian cybercrime underground Russia-linked cybercriminals are reportedly abusing a popular penetration-testing tool in ransomware campaigns around the world, researchers have found. In research published Thursday, cybersecurity firm Silent Push said that the open-source command-and-control framework AdaptixC2 — originally designed for penetration testers — has been used to deliver malicious payloads in multiple recent attacks. Researchers traced the tool’s development and promotion to a figure using the handle “RalfHacker,” who appears to maintain the project and operate a Russian-language Telegram channel. The individual describes themselves as a penetration tester, red team operator and “malware developer.” “RalfHacker’s ties to Russia’s…