Dxcap Proxy Execution (Windows Event Log)

Group by: _time, host
Source: github.com/anvilogic-forge/armory

DXCap.exe is a command-line tool for graphics diagnostics capture and playback. It supports Direct3D 10 through Direct3D 12 across all feature levels. Local execution of a process as a subprocess of Dxcap.exe

MITRE ATT&CK coverage

Tactic	Techniques
Stealth	`T1218` System Binary Proxy Execution

References

https://lolbas-project.github.io/lolbas/OtherMSBinaries/Dxcap/

Telemetry coverage

Provider	Record / event type
Security-Auditing	Event ID 4688: A new process has been created.

Rule body

id: '6583.7596'
title: Dxcap Proxy Execution
description: DXCap.exe is a command-line tool for graphics diagnostics capture and
  playback. It supports Direct3D 10 through Direct3D 12 across all feature levels.
  Local execution of a process as a subprocess of Dxcap.exe Living Off the Land Binary
  and Scripts (LOLBAS) (LOLBIN)
logic_format: Splunk
logic: '`get_endpoint_data` `get_endpoint_data_winevent` (TERM(EventCode=4688) OR
  "<EventID>4688<" OR Type=process) "dxcap" | table _time, host, user user, process,
  process_*, parent_* | bin span=1s | stats values(*) as * by _time, host | where
  match(parent_process_name, "(?i)dxcap") OR match(process, "(?i)dxcap.+?\-c") '
techniques:
- defense-evasion:system binary proxy execution
technique_id: 
- T1218
data_category:
- Windows event logs
references:
- https://lolbas-project.github.io/lolbas/OtherMSBinaries/Dxcap/

Stages and Predicates

Stage 1: `search`

`get_endpoint_data` `get_endpoint_data_winevent` (TERM(EventCode=4688) OR "<EventID>4688<" OR Type=process) "dxcap"

Stage 2: `table`

| table _time, host, user user, process, process_*, parent_*

Stage 3: `bucket`

| bin span=1s

Stage 4: `stats`

| stats values(*) as * by _time, host

Stage 5: `where`

| where match(parent_process_name, "(?i)dxcap") OR match(process, "(?i)dxcap.+?\-c")

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`EventCode`	eq	`4688` corpus 317 (splunk 283, kusto 33, elastic 1)	`field:"EventID" kind:eq value:"4688"`
`parent_process_name`	regex_match	`"(?i)dxcap"`	`field:"parent_process_name" kind:regex_match`
`process`	regex_match	`"(?i)dxcap.+?\-c"`	`field:"CommandLine" kind:regex_match`

Search terms

These SPL tokens match against raw event text.

Stage	Term
1	`"<EventID>4688<"`
1	`"dxcap"`