Network Service Discovery
Where this stands
A Sigma rule exists for this technique in the corpus.
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When a detection for this fires
Discovery and enumerationSomeone was mapping the estate. On its own it is weak evidence; alongside anything else it is a timeline anchor.What the technique is
Adversaries may attempt to get a listing of services running on remote hosts and local network infrastructure devices, including those that may be vulnerable to remote software exploitation. Common methods to acquire this information include port, vulnerability, and/or wordlist scans using tools that are brought onto a system. Within cloud environments, adversaries may attempt to discover services running on other cloud hosts. Additionally, if the cloud environment is connected to a on-premises environment, adversaries may be able to identify services running on non-cloud systems as well. Within macOS environments, adversaries may use the native Bonjour application to discover services running on other macOS hosts within a network. The Bonjour mDNSResponder daemon automatically registers and advertises a host’s registered services on the network. For example, adversaries can use a mDNS query (such as dns-sd -B _ssh._tcp.) to find other systems broadcasting the ssh service.
Read it on attack.mitre.orgWhat MITRE says you would watch
- AN1057
Detects processes performing network enumeration (e.g., port scans, service probing) by correlating process creation, socket connections, and sequential destination IP probing within a time window.
- AN1058
Detects use of network scanning utilities or scripts performing rapid connections to multiple services or hosts using auditd and netflow/pcap telemetry.
- AN1059
Detects Bonjour-based mDNS enumeration or use of system tools (e.g., dns-sd, nmap) to find active services via multicast probing or targeted scans.
Technique names and descriptions © MITRE ATT&CK®, CC BY 4.0. Not endorsed by MITRE.