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T1033 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 OS 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. Adversaries may use the information from System Owner/User Discovery during automated discovery to shape follow-on behaviors, including whether or not the adversary fully infects the target and/or attempts specific actions.

Various utilities and commands may acquire this information, including whoami. In macOS and Linux, the currently logged in user can be identified with w and who. On macOS the dscl . list /Users | grep -v ‘_’ command can also be used to enumerate user accounts. Environment variables, such as %USERNAME% and $USER, may also be used to access this information.

On network devices, Network Device CLI commands such as show users and show ssh can be used to display users currently logged into the device.12

Item Value
ID T1033
Tactics TA0007
Platforms Linux, Network, Windows, macOS
Version 1.4
Created 31 May 2017
Last Modified 12 April 2023

Procedure Examples

ID Name Description
S1028 Action RAT Action RAT has the ability to collect the username from an infected host.57
S0331 Agent Tesla Agent Tesla can collect the username from the victim’s machine.127128129
S0092 Agent.btz Agent.btz obtains the victim username and saves it to a file.63
S1025 Amadey Amadey has collected the user name from a compromised host using GetUserNameA.14
G0073 APT19 APT19 used an HTTP malware variant and a Port 22 malware variant to collect the victim’s username.192
G0022 APT3 An APT3 downloader uses the Windows command “cmd.exe” /C whoami to verify that it is running with the elevated privileges of “System.”174
G0050 APT32 APT32 collected the victim’s username and executed the whoami command on the victim’s machine. APT32 executed shellcode to collect the username on the victim’s machine. 20420568
G0067 APT37 APT37 identifies the victim username.173
G0082 APT38 APT38 has identified primary users, currently logged in users, sets of users that commonly use a system, or inactive users.175
G0087 APT39 APT39 used Remexi to collect usernames from the system.191
G0096 APT41 APT41 used the WMIEXEC utility to execute whoami commands on remote machines.169
S0456 Aria-body Aria-body has the ability to identify the username on a compromised host.71
S1029 AuTo Stealer AuTo Stealer has the ability to collect the username from an infected host.57
S0344 Azorult Azorult can collect the username from the victim’s machine.27
S0414 BabyShark BabyShark has executed the whoami command.107
S0093 Backdoor.Oldrea Backdoor.Oldrea collects the current username from the victim.162
S0534 Bazar Bazar can identify the username of the infected user.112
S0017 BISCUIT BISCUIT has a command to gather the username from the system.102
S1068 BlackCat BlackCat can utilize net use commands to discover the user name on a compromised host.99
S0521 BloodHound BloodHound can collect information on user sessions.7
S0657 BLUELIGHT BLUELIGHT can collect the username on a compromised host.87
S0486 Bonadan Bonadan has discovered the username of the user running the backdoor.50
S0635 BoomBox BoomBox can enumerate the username on a compromised host.80
S1039 Bumblebee Bumblebee has the ability to identify the user name.123
C0017 C0017 During C0017, APT41 used whoami to gather information from victim machines.206
C0018 C0018 During C0018, the threat actors collected whoami information via PowerShell scripts.208
S0351 Cannon Cannon can gather the username from the system.125
S0348 Cardinal RAT Cardinal RAT can collect the username from a victim machine.19
S0572 Caterpillar WebShell Caterpillar WebShell can obtain a list of user accounts from a victim’s machine.97
S0631 Chaes Chaes has collected the username and UID from the infected machine.73
G0114 Chimera Chimera has used the quser command to show currently logged on users.171
S0667 Chrommme Chrommme can retrieve the username from a targeted system.59
S0660 Clambling Clambling can identify the username on a compromised host.1213
S1024 CreepySnail CreepySnail can execute getUsername on compromised systems.146
S0115 Crimson Crimson can identify the user on a targeted system.134133135
S0498 Cryptoistic Cryptoistic can gather data on the user of a compromised host.60
S0334 DarkComet DarkComet gathers the username from the victim’s machine.46
S0673 DarkWatchman DarkWatchman has collected the username from a victim machine.151
S0354 Denis Denis enumerates and collects the username from the victim’s machine.6768
S0021 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.81
S0659 Diavol Diavol can collect the username from a compromised host.54
S1021 DnsSystem DnsSystem can use the Windows user name to create a unique identification for infected users and systems.96
S0186 DownPaper DownPaper collects the victim username and sends it to the C2 server.69
G0035 Dragonfly Dragonfly used the command query user on victim hosts.199
S0694 DRATzarus DRATzarus can obtain a list of users from an infected machine.166
S0024 Dyre Dyre has the ability to identify the users on a compromised host.20
G1006 Earth Lusca Earth Lusca collected information on user accounts via the whoami command.200
S0554 Egregor Egregor has used tools to gather information about users.113
S0363 Empire Empire can enumerate the username on targeted hosts.11
S0091 Epic Epic collects the user name from the victim’s machine.85
S0568 EVILNUM EVILNUM can obtain the username from the victim’s machine.75
S0401 Exaramel for Linux Exaramel for Linux can run whoami to identify the system owner.95
S0569 Explosive Explosive has collected the username from the infected host.106
S0171 Felismus Felismus collects the current username and sends it to the C2 server.32
S0267 FELIXROOT FELIXROOT collects the username from the victim’s machine.164165
G0051 FIN10 FIN10 has used Meterpreter to enumerate users on remote systems.198
S0696 Flagpro Flagpro has been used to run the whoami command on the system.152
S0381 FlawedAmmyy FlawedAmmyy enumerates the current user during the initial infection.160159
C0001 Frankenstein During Frankenstein, the threat actors used Empire to enumerate hosts and gather username, machine name, and administrative permissions information.11
S1044 FunnyDream FunnyDream has the ability to gather user information from the targeted system using whoami/upn&whoami/fqdn&whoami/logonid&whoami/all.42
G0093 GALLIUM GALLIUM used whoami and query user to obtain information about the victim user.176
G0047 Gamaredon Group A Gamaredon Group file stealer can gather the victim’s username to send to a C2 server.172
S0168 Gazer Gazer obtains the current user’s security identifier.82
S0666 Gelsemium Gelsemium has the ability to distinguish between a standard user and an administrator on a compromised host.59
S0460 Get2 Get2 has the ability to identify the current username of an infected host.110
S0249 Gold Dragon Gold Dragon collects the endpoint victim’s username and uses it as a basis for downloading additional components from the C2 server.70
S0477 Goopy Goopy has the ability to enumerate the infected system’s user name.68
S0531 Grandoreiro Grandoreiro can collect the username from the victim’s machine.72
S0237 GravityRAT GravityRAT collects the victim username along with other account information (account type, description, full name, SID and status).141
S0632 GrimAgent GrimAgent can identify the user id on a target machine.31
G0125 HAFNIUM HAFNIUM has used whoami to gather user information.180
S0214 HAPPYWORK can collect the victim user name.104
S0391 HAWKBALL HAWKBALL can collect the user name of the system.18
G1001 HEXANE HEXANE has run whoami on compromised machines to identify the current user.193
S0431 HotCroissant HotCroissant has the ability to collect the username on the infected host.26
S0260 InvisiMole InvisiMole lists local users and session information.64
S0015 Ixeshe Ixeshe collects the username from the victim’s machine.90
S0201 JPIN JPIN can obtain the victim user name.88
S0265 Kazuar Kazuar gathers information on users.56
G0004 Ke3chang Ke3chang has used implants capable of collecting the signed-in username.94
S0250 Koadic Koadic can identify logged in users across the domain and views user sessions.43
S0162 Komplex The OsInfo function in Komplex collects the current running username.124
S0356 KONNI KONNI can collect the username from the victim’s machine.150
S0236 Kwampirs Kwampirs collects registered owner details by using the commands systeminfo and net config workstation.58
G0032 Lazarus Group Various Lazarus Group malware enumerates logged-on users.18518218318418760186
S0362 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. 78
S0513 LiteDuke LiteDuke can enumerate the account name on a targeted system.132
S0680 LitePower LitePower can determine if the current user has admin privileges.157
S0681 Lizar Lizar can collect the username from the system.24
S0447 Lokibot Lokibot has the ability to discover the username on the infected host.36
S0532 Lucifer Lucifer has the ability to identify the username on a compromised host.144
G1014 LuminousMoth LuminousMoth has used a malicious DLL to collect the username from compromised hosts.170
S1016 MacMa MacMa can collect the username from the compromised machine.98
S1060 Mafalda Mafalda can collect the username from a compromised host.43
G0059 Magic Hound Magic Hound malware has obtained the victim username and sent it to the C2 server.203202201
S0652 MarkiRAT MarkiRAT can retrieve the victim’s username.33
S0459 MechaFlounder MechaFlounder has the ability to identify the username and hostname on a compromised host.21
S1059 metaMain metaMain can collect the username from a compromised host.43
S0455 Metamorfo Metamorfo has collected the username from the victim’s machine.149
S0339 Micropsia Micropsia collects the username from the victim’s machine.25
S1015 Milan Milan can identify users registered to a targeted machine.62
S0280 MirageFox MirageFox can gather the username from the victim’s machine.84
S0084 Mis-Type Mis-Type runs tests to determine the privilege level of the compromised user.100
S0149 MoonWind MoonWind obtains the victim username.28
S0284 More_eggs More_eggs has the capability to gather the username from the victim’s machine.9293
S0256 Mosquito Mosquito runs whoami on the victim’s machine.114
G0069 MuddyWater MuddyWater has used malware that can collect the victim’s username.194195
S0228 NanHaiShu NanHaiShu collects the username from the victim.145
S0590 NBTscan NBTscan can list active users on the system.89
S0272 NDiskMonitor NDiskMonitor obtains the victim username and encrypts the information to send over its C2 channel.103
S0691 Neoichor Neoichor can collect the user name from a victim’s machine.94
C0002 Night Dragon During Night Dragon, threat actors used password cracking and pass-the-hash tools to discover usernames and passwords.40
S0385 njRAT njRAT enumerates the current user during the initial infection.117
S0353 NOKKI NOKKI can collect the username from the victim’s machine.126
S0644 ObliqueRAT ObliqueRAT can check for blocklisted usernames on infected endpoints.142
S0340 Octopus Octopus can collect the username from the victim’s machine.89
G0049 OilRig OilRig has run whoami on a victim.17817979
S0439 Okrum Okrum can collect the victim username.148
C0012 Operation CuckooBees During Operation CuckooBees, the threat actors used the query user and whoami commands as part of their advanced reconnaissance.209
C0014 Operation Wocao During Operation Wocao, threat actors enumerated sessions and users on a remote host, and identified privileged users logged into a targeted system.207
G0040 Patchwork Patchwork collected the victim username and whether it was running as admin, then sent the information to its C2 server.189103
S0428 PoetRAT PoetRAT sent username, computer name, and the previously generated UUID in reply to a “who” command from C2.16
S0139 PowerDuke PowerDuke has commands to get the current user’s name and SID.30
S0441 PowerShower PowerShower has the ability to identify the current user on the infected host.61
S0223 POWERSTATS POWERSTATS has the ability to identify the username on the compromised host.74
S0184 POWRUNER POWRUNER may collect information about the currently logged in user by running whoami on a victim.161
S0113 Prikormka A module in Prikormka collects information from the victim about the current user name.35
S0192 Pupy Pupy can enumerate local information for Linux hosts and find currently logged on users for Windows hosts.10
S1032 PyDCrypt PyDCrypt has probed victim machines with whoami and has collected the username from the machine.48
S0650 QakBot QakBot can identify the user name on a compromised system.131130
S0269 QUADAGENT QUADAGENT gathers the victim username.17
S0262 QuasarRAT QuasarRAT can enumerate the username and account type.5
S0241 RATANKBA RATANKBA runs the whoami and query user commands.47
S0662 RCSession RCSession can gather system owner information, including user and administrator privileges.143
S0172 Reaver Reaver collects the victim’s username.118
S0153 RedLeaves RedLeaves can obtain information about the logged on user both locally and for Remote Desktop sessions.66
S0125 Remsec Remsec can obtain information about the current user.140
S0379 Revenge RAT Revenge RAT gathers the username from the system.139
S0258 RGDoor RGDoor executes the whoami on the victim’s machine.22
S0433 Rifdoor Rifdoor has the ability to identify the username on the compromised host.26
S0448 Rising Sun Rising Sun can detect the username of the infected host.23
S0270 RogueRobin RogueRobin collects the victim’s username and whether that user is an admin.105
S0240 ROKRAT ROKRAT can collect the username from a compromised host.77
S0148 RTM RTM can obtain the victim username and permissions.153
S0085 S-Type S-Type has run tests to determine the privilege level of the compromised user.100
S1018 Saint Bot Saint Bot can collect the username from a compromised host.34
G0034 Sandworm Team Sandworm Team has collected the username from a compromised host.177
S0461 SDBbot SDBbot has the ability to identify the user on a compromised host.110
S0382 ServHelper ServHelper will attempt to enumerate the username of the victim.136
S0596 ShadowPad ShadowPad has collected the username of the victim system.111
S0450 SHARPSTATS SHARPSTATS has the ability to identify the username on the compromised host.74
S0610 SideTwist SideTwist can collect the username on a targeted system.79
G0121 Sidewinder Sidewinder has used tools to identify the user of a compromised host.190
S0692 SILENTTRINITY SILENTTRINITY can gather a list of logged on users.6
S0533 SLOTHFULMEDIA SLOTHFULMEDIA has collected the username from a victim machine.83
S1035 Small Sieve Small Sieve can obtain the id of a logged in user.41
S0649 SMOKEDHAM SMOKEDHAM has used whoami commands to identify system owners.163
S0627 SodaMaster SodaMaster can identify the username on a compromised host.49
S0615 SombRAT SombRAT can execute getinfo to identify the username on a compromised host.137138
S0543 Spark Spark has run the whoami command and has a built-in command to identify the user logged in.39
S0374 SpeakUp SpeakUp uses the whoami command. 156
S1030 Squirrelwaffle Squirrelwaffle can collect the user name from a compromised host.122
S0058 SslMM SslMM sends the logged-on username to its hard-coded C2.45
S1037 STARWHALE STARWHALE can gather the username from an infected host.116115
G0038 Stealth Falcon Stealth Falcon malware gathers the registered user and primary owner name via WMI.196
S1034 StrifeWater StrifeWater can collect the user name from the victim’s machine.119
S0559 SUNBURST SUNBURST collected the username from a compromised host.5152
S1064 SVCReady SVCReady can collect the username from an infected host.37
S0242 SynAck SynAck gathers user names from infected hosts.44
S0060 Sys10 Sys10 collects the account name of the logged-in user and sends it to the C2.45
S0663 SysUpdate SysUpdate can collect the username from a compromised host.120
S0098 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.76
G0027 Threat Group-3390 Threat Group-3390 has used whoami to collect system user information.12
S0266 TrickBot TrickBot can identify the user and groups the user belongs to on a compromised host.167
S0094 Trojan.Karagany Trojan.Karagany can gather information about the user on a compromised host.91
G0081 Tropic Trooper Tropic Trooper used letmein to scan for saved usernames on the target system.168
S0647 Turian Turian can retrieve usernames.55
S0130 Unknown Logger Unknown Logger can obtain information about the victim usernames.53
S0275 UPPERCUT UPPERCUT has the capability to collect the current logged on user’s username from a machine.86
S0476 Valak Valak can gather information regarding the user.155
S0257 VERMIN VERMIN gathers the username from the victim’s machine.154
S0515 WellMail WellMail can identify the current username on the victim system.65
S0514 WellMess WellMess can collect the username on the victim machine to send to C2.29
S0155 WINDSHIELD WINDSHIELD can gather the victim user name.15
G0112 Windshift Windshift has used malware to identify the username on a compromised host.188
S0219 WINERACK WINERACK can gather information on the victim username.104
S0059 WinMM WinMM uses NetUser-GetInfo to identify that it is running under an “Admin” account on the local system.45
G0102 Wizard Spider Wizard Spider has used “whoami” to identify the local user and their privileges.181
S1065 Woody RAT Woody RAT can retrieve a list of user accounts and usernames from an infected machine.38
S0161 XAgentOSX XAgentOSX contains the getInfoOSX function to return the OS X version as well as the current user.158
S0248 yty yty collects the victim’s username.101
S0251 Zebrocy Zebrocy gets the username from the system.108109
G0128 ZIRCONIUM ZIRCONIUM has used a tool to capture the username on a compromised host in order to register it with C2.197
S0350 zwShell zwShell can obtain the name of the logged-in user on the victim.40
S0412 ZxShell ZxShell can collect the owner and organization information from the target workstation.121
S1013 ZxxZ ZxxZ can collect the username from a compromised host.147


ID Data Source Data Component
DS0026 Active Directory Active Directory Object Access
DS0017 Command Command Execution
DS0022 File File Access
DS0029 Network Traffic Network Traffic Content
DS0009 Process OS API Execution
DS0024 Windows Registry Windows Registry Key Access


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