Account Discovery T1087

Events covered

34 catalog events are tagged with this technique by at least one rule.

Authoring guide

Patterns shared across the 132 rules above: which fields they filter on, what specific values they look for, and what they exclude. The catalog normalizes field names across vendors so Sigma's Image, Elastic's process.name, and Splunk's process_name collapse into one row. Each rule contributes at most once per row.

Fields filtered most (61 distinct)

The fields most rules look at when detecting this technique. The How column shows the operators authors use (eq, wildcard, regex_match, match) and how often each appears. Sample values are concrete examples to start from, not an exhaustive list.

Top indicator values (1361 distinct)

Specific (field, operator, value) combinations the rules check for, ranked by how many rules under this technique use each one. The Corpus reach column counts how many rules across the entire catalog (any technique) check the same combination. High numbers point to widely-used indicators that are likely noisy on their own; combine them with another condition for useful signal. Blank means the combination is specific to rules under this technique. Click a value to expand the rules under this technique that use it.

Exclusions (92 distinct)

Field/operator/value combinations excluded by rules under this technique (top-level not() clauses), sorted by how many rules exclude each. These are the false-positive paths the community has learned to filter out. A new rule that ignores the high-count entries here will likely fire on the same noisy paths. Click a value to expand the rules under this technique that exclude it.

Rules under this technique

Every rule in the catalog tagged with this technique, grouped by vendor. Click a rule title for its full predicates, exclusions, and indicators.

Sigma 41 rules

• Active Directory Computers Enumeration With Get-AdComputer
• Active Directory Database Snapshot Via ADExplorer
• Active Directory honeypot enumerated by a suspicious host (Bloodhound)
• Active Directory Structure Export Via Csvde.EXE
• AD Privileged Users or Groups Reconnaissance
• ADExplorer Writing Complete AD Snapshot Into .dat File
• BloodHound Collection Files
• Chopper Webshell Process Pattern
• Domain group enumeration
• Group discovery (command)
• HackTool - Bloodhound/Sharphound Execution
• HackTool - SOAPHound Execution
• HackTool - winPEAS Execution
• Hacktool Ruler
• Local Accounts Discovery
• Local domain group enumeration
• Malicious PowerShell Commandlets - PoshModule
• Malicious PowerShell Commandlets - ProcessCreation
• Malicious PowerShell Commandlets - ScriptBlock
• Net.EXE Execution
• Network Reconnaissance Activity
• Potential Active Directory Reconnaissance/Enumeration Via LDAP
• Potential AD User Enumeration From Non-Machine Account
• Potential Pikabot Discovery Activity
• Potentially Suspicious EventLog Recon Activity Using Log Query Utilities
• PUA - AdFind Suspicious Execution
• PUA - AdFind.EXE Execution
• PUA - Seatbelt Execution
• PUA - Suspicious ActiveDirectory Enumeration Via AdFind.EXE
• Reconnaissance Activity
• Renamed AdFind Execution
• Suspicious Active Directory Database Snapshot Via ADExplorer
• Suspicious Group And Account Reconnaissance Activity Using Net.EXE
• Suspicious Reconnaissance Activity Using Get-LocalGroupMember Cmdlet
• Suspicious SPN enumeration previous to Kerberoasting attack (native commands)
• Suspicious SPN enumeration previous to Kerberoasting attack (PowerShell)
• Suspicious Use of PsLogList
• Uncommon Connection to Active Directory Web Services
• User properties enumeration via commandline
• Webshell Detection With Command Line Keywords
• Webshell Hacking Activity Patterns

Elastic 10 rules

• Account Discovery Command via SYSTEM Account
• Active Directory Discovery using AdExplorer
• AdFind Command Activity
• Enumeration Command Spawned via WMIPrvSE
• Enumeration of Administrator Accounts
• Mounting Hidden or WebDav Remote Shares
• Potential Enumeration via Active Directory Web Service
• Suspicious Access to LDAP Attributes
• Suspicious JetBrains TeamCity Child Process
• Windows Account or Group Discovery

Splunk 73 rules

• Adfind Commands (PowerShell)
• Adfind Commands (Sysmon)
• Adfind Commands (Windows Event Log)
• Adfind Execution (EDR)
• Adfind Execution (PowerShell)
• Adfind Execution (Sysmon)
• Adfind Execution (Windows Event Log)
• AdsiSearcher Account Discovery
• Common Active Directory Commands (PowerShell)
• Common Active Directory Commands (Sysmon)
• Common Active Directory Commands (Windows Event Log)
• Common Exchange Recon cmdlets (PowerShell)
• Common Recon Commands in Short Burst (Sysmon)
• Common Recon Commands in Short Burst (Windows Event Log)
• Common Reconnaissance Commands (PowerShell)
• Common Reconnaissance Commands (Sysmon)
• Common Reconnaissance Commands (Windows Event Log)
• CSVDE Export Active Directory (PowerShell)
• CSVDE Export Active Directory (Sysmon)
• CSVDE Export Active Directory (Windows Event Log)
• Detect AzureHound Command-Line Arguments
• Detect AzureHound File Modifications
• Detect SharpHound Command-Line Arguments
• Detect SharpHound File Modifications
• Detect SharpHound Usage
• Disabled Pre-Authentication Accounts Discovery - PowerShell (PowerShell)
• Disabled Pre-Authentication Accounts Discovery - PowerShell (Sysmon)
• Disabled Pre-Authentication Accounts Discovery - PowerShell (Windows Event Log)
• Domain Account Discovery with Dsquery
• Domain Account Discovery with Wmic
• Enumerate Users Local Group Using Telegram
• Get ADUser with PowerShell
• Get ADUser with PowerShell Script Block
• Get DomainUser with PowerShell
• Get DomainUser with PowerShell Script Block
• GetLocalUser with PowerShell
• GetLocalUser with PowerShell Script Block
• GetWmiObject DS User with PowerShell
• GetWmiObject DS User with PowerShell Script Block
• GetWmiObject User Account with PowerShell
• GetWmiObject User Account with PowerShell Script Block
• IcedID Discovery Commands (EDR)
• IcedID Discovery Commands (Sysmon)
• IcedID Discovery Commands (Windows Event Log)
• Local Account Discovery With Wmic
• Network Traffic to Active Directory Web Services Protocol
• Potential PowerShell Post-Exploitation Activity (Sysmon)
• Potential PowerShell Post-Exploitation Activity (Windows Event Log)
• PowerHuntShares Commands (PowerShell)
• PowerHuntShares Commands (Sysmon)
• PowerHuntShares Commands (Windows Event Log)
• SchCache Change By App Connect And Create ADSI Object
• SharpHound Enumeration (Windows Event Log)
• SharpHound Keywords (PowerShell)
• User_Domain Enumeration Tool - Windows (PowerShell)
• User_Domain Enumeration Tool - Windows (Sysmon)
• User_Domain Enumeration Tool - Windows (Windows Event Log)
• Windows Account Discovery for None Disable User Account
• Windows Account Discovery for Sam Account Name
• Windows Account Discovery With NetUser PreauthNotRequire
• Windows AD Abnormal Object Access Activity
• Windows AD Privileged Object Access Activity
• Windows Domain Account Discovery Via Get-NetComputer
• Windows Find Domain Organizational Units with GetDomainOU
• Windows Find Interesting ACL with FindInterestingDomainAcl
• Windows Forest Discovery with GetForestDomain
• Windows Get Local Admin with FindLocalAdminAccess
• Windows Linked Policies In ADSI Discovery
• Windows Root Domain linked policies Discovery
• Windows SOAPHound Binary Execution
• Windows Special Privileged Logon On Multiple Hosts
• Windows Suspect Process With Authentication Traffic
• Windows User Discovery Via Net

Kusto 7 rules

• ADWS Connection from Process Injection Target
• ADWS Connection from Unexpected Binary
• Detect Suspicious Commands Initiated by Webserver Processes
• Large number of AD objects accessed by user
• LDAP reconnaissance via search filters
• Powershell Empire Cmdlets Executed in Command Line
• Probable AdFind Recon Tool Usage

YARA-L 1 rule

• Purple Knight Tool Execution Detected