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GetWmiObject DS User with PowerShell Script Block

Author
Teoderick Contreras, Mauricio Velazco, Splunk
Source
upstream

The following analytic detects the execution of the Get-WmiObject cmdlet with the DS_User class parameter via PowerShell Script Block Logging (EventCode=4104). It leverages logs to identify attempts to query all domain users using WMI. This activity is significant as it may indicate an adversary or Red Team operation attempting to enumerate domain users for situational awareness and Active Directory discovery. If confirmed malicious, this behavior could lead to further reconnaissance, enabling attackers to map out the network and identify potential targets for privilege escalation or lateral movement.

MITRE ATT&CK coverage

TacticTechniques
DiscoveryT1087.002 Account Discovery: Domain Account

Event coverage

ProviderEvent IDTitle
PowerShell4104Creating Scriptblock text (MessageNumber of MessageTotal).

Stages and Predicates

Stage 1: search

search EventCode=4104 ScriptBlockText="*-namespace*" ScriptBlockText="*ds_user*" ScriptBlockText="*get-wmiobject*" ScriptBlockText="*root\\directory\\ldap*"

Stage 2: fillnull

fillnull

Stage 3: stats

stats BY dest, signature, signature_id, user_id, vendor_product, EventID, Guid, Opcode, Name, Path, ProcessID, ScriptBlockId, ScriptBlockText

Stage 4: search

search

Stage 5: search

search

Stage 6: search

search `macro`

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

FieldKindValues
EventCodeeq
  • 4104 corpus 108 (splunk 108)
ScriptBlockTexteq
  • "*-namespace*"
  • "*ds_user*"
  • "*get-wmiobject*"
  • "*root\\directory\\ldap*"

Neighbors

Broader alternatives (more inclusive than this rule)

These rules match a superset of what this rule catches. They cover the same events plus more. Use them if you want wider coverage and can absorb more false positives.