System Owner/User Discovery
|System Owner/User Discovery|
|Platform||Linux, macOS, Windows|
|Permissions Required||User, Administrator|
|Data Sources||File monitoring, Process monitoring, Process command-line parameters|
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
- APT28 has queried information on machines to determine the current user or system owner 1.
- An APT3 downloader uses the Windows command
"cmd.exe" /C whoamito verify that it is running with the elevated privileges of “System.”2
- FIN10 has used Meterpreter to enumerate users on remote systems.3
- A Gamaredon Group file stealer can gather the victim's username to send to a C2 server.4
- Various Lazarus Group malware enumerates logged-on users.5678
- Magic Hound malware has obtained the victim username and sent it to the C2 server.9
- OilRig has run
whoamion a victim.1011
- Patchwork collected the victim username and whether it was running as admin, then sent the information to its C2 server.12
- Stealth Falcon malware gathers the registered user and primary owner name via WMI.13
- Agent.btz obtains the victim username and saves it to a file.14
- Backdoor.Oldrea collects the current username from the victim.15
- 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.16
- DownPaper collects the victim username and sends it to the C2 server.17
- Felismus collects the current username and sends it to the C2 server.18
- Gazer obtains the current user's security identifier.19
- can collect the victim user name.20
- JPIN can obtain the victim user name.21
- The OsInfo function in Komplex collects the current running username.22
- Mis-Type runs tests to determine the privilege level of the compromised user.23
- MoonWind obtains the victim username.24
- NanHaiShu can gather the victim username.25
- POWRUNER may collect information about the currently logged in user by running
whoamion a victim.26
- PowerDuke has commands to get the current user's name and SID.27
- A module in Prikormka collects information from the victim about the current user name.28
- Pupy can enumerate local information for Linux hosts and find currently logged on users for Windows hosts. 29
- RTM can obtain the victim username and permissions.30
- Reaver collects the victim's username.31
- RedLeaves can obtain information about the logged on user both locally and for Remote Desktop sessions.32
- Remsec can obtain information about the current user.33
- SslMM sends the logged-on username to its hard-coded C2.34
- Sys10 collects the account name of the logged-in user and sends it to the C2.34
- 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.35
- Unknown Logger can obtain information about the victim usernames.36
- WINDSHIELD can gather the victim user name.37
- can gather information on the victim username.20
- WinMM uses NetUser-GetInfo to identify that it is running under an “Admin” account on the local system.34
- XAgentOSX contains the getInfoOSX function to return the OS X version as well as the current user.1
Identify unnecessary system utilities or potentially malicious software that may be used to acquire information about system users, and audit and/or block them by using whitelisting38 tools, like AppLocker,3940 or Software Restriction Policies41 where appropriate.42
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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