System Owner/User Discovery
Adversaries may attempt to identify the primary user, currently logged in user, set of users that commonly uses a system, or whether a user is actively using the system. They may do this, for example, by retrieving account usernames or by using Credential Dumping. The information may be collected in a number of different ways using other Discovery techniques, because user and username details are prevalent throughout a system and include running process ownership, file/directory ownership, session information, and system logs.
On Mac, the currently logged in user can be identified with
On Linux, the currently logged in user can be identified with
|Agent Tesla||Agent Tesla collects the username from the victim’s machine.  |
|Agent.btz||Agent.btz obtains the victim username and saves it to a file. |
|APT19||APT19 used an HTTP malware variant and a Port 22 malware variant to collect the victim’s username. |
An APT3 downloader uses the Windows command
APT32 collected the victim's username and executed the
|APT37||APT37 identifies the victim username. |
|APT39||APT39 used Remexi to collect usernames from the system. |
|Azorult||Azorult can collect the username from the victim’s machine. |
|Backdoor.Oldrea||Backdoor.Oldrea collects the current username from the victim. |
|BISCUIT||BISCUIT has a command to gather the username from the system. |
|Cannon||Cannon can gather the username from the system. |
|Cardinal RAT||Cardinal RAT can collect the username from a victim machine. |
|DarkComet||DarkComet gathers the username from the victim’s machine. |
|Denis||Denis collects the username from the victim’s machine. |
|Derusbi||A Linux version of Derusbi checks if the victim user ID is anything other than zero (normally used for root), and the malware will not execute if it does not have root privileges. Derusbi also gathers the username of the victim. |
|DownPaper||DownPaper collects the victim username and sends it to the C2 server. |
Dragonfly 2.0 used the command
|Epic||Epic collects the user name from the victim’s machine. |
|Felismus||Felismus collects the current username and sends it to the C2 server. |
|FELIXROOT||FELIXROOT collects the username from the victim’s machine.  |
|FIN10||FIN10 has used Meterpreter to enumerate users on remote systems. |
|FlawedAmmyy||FlawedAmmyy enumerates the current user during the initial infection. |
|Gamaredon Group||A Gamaredon Group file stealer can gather the victim's username to send to a C2 server. |
|Gazer||Gazer obtains the current user's security identifier. |
|Gold Dragon||Gold Dragon collects the endpoint victim's username and uses it as a basis for downloading additional components from the C2 server. |
|GravityRAT||GravityRAT collects the victim username along with other account information (account type, description, full name, SID and status). |
|HAPPYWORK||can collect the victim user name. |
|HAWKBALL||HAWKBALL can collect the user name of the system. |
|InvisiMole||InvisiMole lists local users and session information. |
|Ixeshe||Ixeshe collects the username from the victim’s machine. |
|JPIN||JPIN can obtain the victim user name. |
|Kazuar||Kazuar gathers information on users. |
|Koadic||Koadic can identify logged in users across the domain and views user sessions. |
|Komplex||The OsInfo function in Komplex collects the current running username. |
|KONNI||KONNI can collect the username from the victim’s machine. |
Kwampirs collects registered owner details by using the commands
|Lazarus Group||Various Lazarus Group malware enumerates logged-on users.     |
|Linux Rabbit||Linux Rabbit opens a socket on port 22 and if it receives a response it attempts to obtain the machine's hostname and Top-Level Domain. |
|Magic Hound||Magic Hound malware has obtained the victim username and sent it to the C2 server. |
|Micropsia||Micropsia collects the username from the victim’s machine. |
|MirageFox||MirageFox can gather the username from the victim’s machine. |
|Mis-Type||Mis-Type runs tests to determine the privilege level of the compromised user. |
|MoonWind||MoonWind obtains the victim username. |
|More_eggs||More_eggs has the capability to gather the username from the victim's machine. |
|MuddyWater||MuddyWater has used malware that can collect the victim’s username. |
|NanHaiShu||NanHaiShu collects the username from the victim. |
|NDiskMonitor||NDiskMonitor obtains the victim username and encrypts the information to send over its C2 channel. |
|njRAT||njRAT enumerates the current user during the initial infection. |
|NOKKI||NOKKI can collect the username from the victim’s machine. |
|Octopus||Octopus collects the username from the victim’s machine. |
OilRig has run
|Patchwork||Patchwork collected the victim username and whether it was running as admin, then sent the information to its C2 server.  |
|PowerDuke||PowerDuke has commands to get the current user's name and SID. |
POWRUNER may collect information about the currently logged in user by running
|Prikormka||A module in Prikormka collects information from the victim about the current user name. |
|Pupy||Pupy can enumerate local information for Linux hosts and find currently logged on users for Windows hosts. |
|QUADAGENT||QUADAGENT gathers the victim username. |
RATANKBA runs the
|Reaver||Reaver collects the victim's username. |
|RedLeaves||RedLeaves can obtain information about the logged on user both locally and for Remote Desktop sessions. |
|Remsec||Remsec can obtain information about the current user. |
|Revenge RAT||Revenge RAT gathers the username from the system. |
RGDoor executes the
|RogueRobin||RogueRobin collects the victim’s username and whether that user is an admin. |
|RTM||RTM can obtain the victim username and permissions. |
|ServHelper||ServHelper will attempt to enumerate the username of the victim. |
Soft Cell used
SpeakUp uses the
|SslMM||SslMM sends the logged-on username to its hard-coded C2. |
|Stealth Falcon||Stealth Falcon malware gathers the registered user and primary owner name via WMI. |
|SynAck||SynAck gathers user names from infected hosts. |
|Sys10||Sys10 collects the account name of the logged-in user and sends it to the C2. |
|T9000||T9000 gathers and beacons the username of the logged in account during installation. It will also gather the username of running processes to determine if it is running as SYSTEM. |
Tropic Trooper used
|Unknown Logger||Unknown Logger can obtain information about the victim usernames. |
|UPPERCUT||UPPERCUT has the capability to collect the current logged on user’s username from a machine. |
|VERMIN||VERMIN gathers the username from the victim’s machine. |
|WINDSHIELD||WINDSHIELD can gather the victim user name. |
|WINERACK||WINERACK can gather information on the victim username. |
|WinMM||WinMM uses NetUser-GetInfo to identify that it is running under an “Admin” account on the local system. |
|XAgentOSX||XAgentOSX contains the getInfoOSX function to return the OS X version as well as the current user. |
|yty||yty collects the victim’s username. |
|Zebrocy||Zebrocy gets the username from the system. |
|zwShell||zwShell can obtain the name of the logged-in user on the victim. |
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 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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