Remote System Discovery
Adversaries may attempt to get a listing of other systems by IP address, hostname, or other logical identifier on a network that may be used for Lateral Movement from the current system. Functionality could exist within remote access tools to enable this, but utilities available on the operating system could also be used such as Ping or
net view using Net. Adversaries may also use local host files (ex:
/etc/hosts) in order to discover the hostname to IP address mappings of remote systems.
Specific to macOS, the
bonjour protocol exists to discover additional Mac-based systems within the same broadcast domain.
Comnie runs the
FIN6 used publicly available tools (including Microsoft's built-in SQL querying tool, osql.exe) to map the internal network and conduct reconnaissance against Active Directory, Structured Query Language (SQL) servers, and NetBIOS.
menuPass uses scripts to enumerate IP ranges on the victim network. menuPass has also issued the command
Turla surveys a system upon check-in to discover remote systems on a local network using the
Wizard Spider has used networkdll for network discovery and psfin specifically for financial and point of sale indicators. Wizard Spider has also used AdFind and
This type of attack technique cannot be easily mitigated with preventive controls since it is based on the abuse of system features.
System and network discovery techniques normally occur throughout an operation as an adversary learns the environment. Data and events should not be viewed in isolation, but as part of a chain of behavior that could lead to other activities, such as Lateral Movement, based on the information obtained.
Normal, benign system and network events related to legitimate remote system discovery may be uncommon, depending on the environment and how they are used. Monitor processes and command-line arguments for actions that could be taken to gather system and network information. Remote access tools with built-in features may interact directly with the Windows API to gather information. Information may also be acquired through Windows system management tools such as Windows Management Instrumentation and PowerShell.
Monitor for processes that can be used to discover remote systems, such as
tracert.exe, especially when executed in quick succession.
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