System Network Connections Discovery
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.
Mac and Linux
In Mac and Linux,
lsof can be used to list current connections.
who -a and
w can be used to show which users are currently logged in, similar to "net session".
admin@338 actors used the following command following exploitation of a machine with LOWBALL malware to display network connections:
APT1 used the
|APT3||APT3 has a tool that can enumerate current network connections.   |
APT32 used the
|BlackEnergy||BlackEnergy has gathered information about local network connections using netstat.  |
Carbon uses the
Comnie executes the
|Duqu||The discovery modules used with Duqu can collect information on network connections. |
|Empire||Empire can enumerate the current network connections of a host. |
Epic uses the
GravityRAT uses the
|jRAT||jRAT can list network connections. |
Ke3chang performs local network connection discovery using
Kwampirs collects a list of active and listening connections by using the command
menuPass has used
|nbtstat||nbtstat can be used to discover current NetBIOS sessions.|
Commands such as
|netstat||netstat can be used to enumerate local network connections, including active TCP connections and other network statistics. |
OilRig has used
OSInfo enumerates the current network connections similar to
PlugX has a module for enumerating TCP and UDP network connections and associated processes using the
|Poseidon Group||Poseidon Group obtains and saves information about victim network interfaces and addresses. |
|PoshC2||PoshC2 contains an implementation of netstat to enumerate TCP and UDP connections. |
POWRUNER may collect active network connections by running
Pupy has a built-in utility command for
|RedLeaves||RedLeaves can enumerate drives and Remote Desktop sessions. |
|Remsec||Remsec can obtain a list of active connections and open ports. |
|SHOTPUT||SHOTPUT uses netstat to list TCP connection status. |
Soft Cell used
SpeakUp uses the
Sykipot may use
Threat Group-3390 has used
Turla surveys a system upon check-in to discover active local network connections using the
|Volgmer||Volgmer can gather information about TCP connection state. |
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.
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.
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