MS-SQL servers, which hold a wealth of sensitive information, are prime targets for hackers. Exploiting these servers’ vulnerabilities enables threat actors to gain unauthorized access, execute commands, and potentially control entire networks. This access facilitates data theft, ransomware deployment, and other malicious activities, making MS-SQL servers a significant security risk.
Researchers at ASEC have observed an increase in attacks on MS-SQL servers, particularly those exposed to the public internet or with poor credential management. Hackers commonly scan for servers with open port 1433 and use brute-force or dictionary attacks to gain SQL admin access. Malware like LemonDuck and Kingminer exploit these weak points, using SQL admin privileges to execute OS commands and install further malicious software.
Although SQL admin access does not directly control the Windows operating system, MS-SQL’s functionalities like xp_cmdshell and OLE automation procedures allow threat actors to execute OS commands. This capability is exploited by malware to gain a foothold in the system and propagate further attacks. Effective detection of such activities requires robust Endpoint Detection and Response solutions that monitor for suspicious behavior.
To mitigate these risks, administrators should implement strong credentials, regular patching, and restrict external access to MS-SQL instances. These servers are often part of ERP and business solutions, making them critical to secure. By addressing these vulnerabilities, organizations can protect their networks from significant security threats.
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