Query: how to detect System Network Connections Discovery
Matching passage: T1049 System Network Connections Discovery. Tactics: discovery. Description: Adversaries may attempt to get a listing of network connections to or from the compromised system they are currently accessing or from remote systems by querying for information over the network. An adversary who gains access to a system that is part of a cloud-based environment may map out Virtual Private Clouds or Virtual Networks in order to determine what systems and services are connected. The actions performed are likely the same types of discovery techniques depending on the operating system, but the resulting information may include details about the networked cloud environment relevant to the adversary's goals. Cloud providers may have different ways in which their virtual networks operate.(Citation: Amazon AWS VPC Guide)(Citation: Microsoft Azure Virtual Network Overview)(Citation: Google VPC Overview) Similarly, adversaries who gain access to network devices may also perform similar discovery activities to gather information about connected systems and services. Utilities and commands that acquire this information include [netstat](https://attack.mitre.org/software/S0104), "net use," and "net session" with [Net](https://attack.mitre.org/software/S0039). In Mac and Linux, [netstat](https://attack.mitre.org/software/S0104) and <code>lsof</code> can be used to list current connections. <code>who -a</code> and <code>w</code> can be used to show which users are currently logged in, similar to "net session". Additionally, built-in features native to network devices and [Network Device CLI](https://attack.mitre.org/techniques/T1059/008) may be used (e.g. <code>show ip sockets</code>, <code>show tcp brief</code>).(Citation: US-CERT-TA18-106A) On ESXi servers, the command `esxi network ip connection list` can be used to list active network connections.(Citation: Sygnia ESXi Ransomware 2025)
Near-miss passage: T1680 Local Storage Discovery. Tactics: discovery. Description: Adversaries may enumerate local drives, disks, and/or volumes and their attributes like total or free space and volume serial number. This can be done to prepare for ransomware-related encryption, to perform [Lateral Movement](https://attack.mitre.org/tactics/TA0109), or as a precursor to [Direct Volume Access](https://attack.mitre.org/techniques/T1006). On ESXi systems, adversaries may use [Hypervisor CLI](https://attack.mitre.org/techniques/T1059/012) commands such as `esxcli` to list storage connected to the host as well as `.vmdk` files.(Citation: TrendMicro)(Citation: TrendMicro ESXI Ransomware) On Windows systems, adversaries can use `wmic logicaldisk get` to find information about local network drives. They can also use `Get-PSDrive` in PowerShell to retrieve drives and may additionally use Windows API functions such as `GetDriveType`.(Citation: Trend Micro MUSTANG PANDA PUBLOAD HIUPAN SEPTEMBER 2024)(Citation: Volexity) Linux has commands such as `parted`, `lsblk`, `fdisk`, `lshw`, and `df` that can list information about disk partitions such as size, type, file system types, and free space. The command `diskutil` on MacOS can be used to list disks while `system_profiler SPStorageDataType` can additionally show information such as a volume’s mount path, file system, and the type of drive in the system. Infrastructure as a Service (IaaS) cloud providers also have commands for storage discovery such as `describe volume` in AWS, `gcloud compute disks list` in GCP, and `az disk list` in Azure.(Citation: AWS docs describe volumes)(Citation: GCP gcloud compute disks list)(Citation: azure az disk)