Hackers frequently target ERP servers due to the wealth of critical data they contain, including sensitive business information and customer data. Compromising an ERP server can lead to various malicious activities, such as data theft, fraud, and disruption of business operations, making it a prime target for threat actors. Recently, the AhnLab Security Intelligence Center (ASEC) uncovered an attack where a hacker infiltrated a Korean company’s ERP server and established a SoftEther VPN server for remote access.
The attacker initially focused on exploiting weak MS-SQL server credentials to gain control over the ERP server. Once access was obtained, the hacker introduced a web shell for future use and installed a SoftEther VPN service to convert the compromised host into a VPN server. This setup likely allowed the attacker to maintain persistent access to the network and conduct further malicious activities remotely.
To achieve their goals, threat actors often employ proxy tools like HTran and FRP alongside malware such as SystemBC or Bunitu. These tools enable them to access internal networks and execute malicious activities while evading detection. The attacker’s use of SoftEther VPN, an open-source program, highlights their intent to leverage compromised ERP servers as part of their command and control (C&C) infrastructure, rather than merely deploying standalone VPN services.
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