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 | T1087.001 Account Discovery: Local Account, T1087.002 Account Discovery: Domain Account |
Event coverage
| Provider | Event | Title |
|---|---|---|
| PowerShell | Event ID 4104 | Creating Scriptblock text (MessageNumber of MessageTotal). |
Rule body yaml
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: eval
| rex field=process mode=sed max_match=0 "s/(?mi)^(Path.+)|^(ScriptBlock ID.+)|^(Creating Scriptblock.+)//g"
Stage 3: eval
| 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
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.
| Field | Kind | Values |
|---|---|---|
EventCode | eq |
|
Search terms
Bare-string tokens in the SPL search body. Splunk matches each token against _raw (the untyped raw event text) anywhere it appears, not against a specific field. These don't surface in the Indicators table because they aren't predicates on a known field.
| Stage | Term |
|---|---|
| 1 | TERM |
| 1 | csvde |
| 1 | "-f" |