Detection rules › Splunk
CSVDE Export Active Directory (PowerShell)
Detects the administration tool csvde.exe attempting to export Active Directory data in an APT scenario
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Discovery |
Telemetry coverage
| Provider | Record / event type |
|---|---|
| PowerShell | Event ID 4104: Creating Scriptblock text (MessageNumber of MessageTotal). |
Rule body
id: '1028.1029'
title: CSVDE Export Active Directory
description: 'Detects the administration tool csvde.exe attempting to export Active
Directory data in an APT scenario. -- Threat Actor Association: Volt Typhoon'
logic_format: Splunk
logic: '`get_endpoint_data` `get_endpoint_data_powershell` EventCode=4104 AND TERM(csvde)
AND TERM(-f) | rex field=process mode=sed max_match=0 "s/(?mi)^(Path.+)|^(ScriptBlock
ID.+)|^(Creating Scriptblock.+)//g"| rex field=process mode=sed "s/([\n\r]+)|(\s\s+)//g"
| table _time, host, user process, signature_id | bin span=1s | stats values(*)
as * by _time, host '
techniques:
- discovery:account discovery:local account
- discovery:account discovery:domain account
technique_id:
- T1087.001
- T1087.002
data_category:
- PowerShell logs
- Process command-line parameters
references: null
Stages and Predicates
Stage 1: search
`get_endpoint_data` `get_endpoint_data_powershell` EventCode=4104 AND TERM(csvde) AND TERM(-f)
Stage 2: rex
| rex field=process mode=sed max_match=0 "s/(?mi)^(Path.+)|^(ScriptBlock ID.+)|^(Creating Scriptblock.+)//g"
Stage 3: rex
| rex field=process mode=sed "s/([\n\r]+)|(\s\s+)//g"
Stage 4: table
| table _time, host, user process, signature_id
Stage 5: bucket
| bin span=1s
Stage 6: stats
| stats values(*) as * by _time, host
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
EventCode | eq |
| field:"EventID" kind:eq value:"4104" |
Search terms
These SPL tokens match against raw event text.
| Stage | Term |
|---|---|
| 1 | csvde |
| 1 | "-f" |