The presence of rundll32.exe executing a process with a legitimate name does not inherently indicate a security incident in a Windows-based Azure environment. rundll32.exe is a legitimate Windows utility that can be used to run functions that are stored in DLLs. While it can be misused by attackers to run malicious code, its usage alone, especially with a seemingly legitimate name, does not provide enough evidence of malicious intent.
In contrast, other signs like unusual system slowdowns, unexpected system restarts, and multiple failed login attempts are typically more direct indicators of potential security issues. Unusual system slowdowns might suggest that malicious processes are consuming system resources, while unexpected restarts could be the result of unauthorized access or attempts to manipulate the system. Multiple failed login attempts, on the other hand, are often a clear sign of brute force attacks or unauthorized access attempts. Thus, these indicators are more closely associated with the potential occurrence of a security incident than the usage of rundll32.exe with a legitimate name.