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GetWmiObject Ds Group with PowerShell Script Block

Author
Mauricio Velazco, Splunk
Source
upstream

The following analytic detects the execution of the Get-WmiObject commandlet with the DS_Group parameter via PowerShell Script Block Logging (EventCode=4104). This method leverages WMI to query all domain groups. Monitoring this activity is crucial as adversaries and Red Teams may use it for domain group enumeration, aiding in situational awareness and Active Directory discovery. If confirmed malicious, this activity could allow attackers to map out the domain structure, potentially leading to further exploitation and privilege escalation within the network.

MITRE ATT&CK coverage

TacticTechniques
DiscoveryT1069.002 Permission Groups Discovery: Domain Groups

Event coverage

ProviderEvent IDTitle
PowerShell4104Creating Scriptblock text (MessageNumber of MessageTotal).

Stages and Predicates

Stage 1: search

search EventCode=4104 ScriptBlockText="*Get-WmiObject*" ScriptBlockText="*class ds_group*" ScriptBlockText="*namespace 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
  • "*class ds_group*"
  • "*namespace root\\directory\\ldap*" corpus 2 (splunk 2)
  • *Get-WmiObject* corpus 2 (splunk 2)

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.