File_Folder Hidden - Windows (PowerShell)

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

This use case detects commands setting the hidden attribute to files or folders on Windows systems. This technique is used by threat actors to evade detection and conceal malicious files from regular view

MITRE ATT&CK coverage

Tactic	Techniques
Defense Impairment	`T1222.001` File and Directory Permissions Modification: Windows Permissions

References

https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1222.001/T1222.001.md#atomic-test-4---attrib---hide-file

Telemetry coverage

Provider	Record / event type
PowerShell	Event ID 4103: Payload Context: ContextInfo User Data: UserData.
PowerShell	Event ID 4104: Creating Scriptblock text (MessageNumber of MessageTotal).

Rule body

id: '17782.29999'
title: File_Folder Hidden - Windows
description: 'This use case detects commands setting the hidden attribute to files
  or folders on Windows systems. This technique is used by threat actors to evade
  detection and conceal malicious files from regular view. Atomics T1222.001 Test
  #4'
logic_format: Splunk
logic: '`get_endpoint_data` `get_endpoint_data_powershell` (TERM(EventCode=4103) OR
  "<EventID>4103<" OR TERM(EventCode=4104) OR "<EventID>4104<") (TERM(attrib) OR TERM(attrib.exe))
  "+h" | regex process="(?i)\s\+h\s+" | table _time, host, user parent_*, process,
  process_* | bin span=1s | stats values(*) as * by _time, host '
techniques:
- defense-evasion:file and directory permissions modification:windows file and directory
  permissions modification
technique_id:
- T1222.001
data_category:
- PowerShell logs
references:
- https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1222.001/T1222.001.md#atomic-test-4---attrib---hide-file

Stages and Predicates

Stage 1: `search`

`get_endpoint_data` `get_endpoint_data_powershell` (TERM(EventCode=4103) OR "<EventID>4103<" OR TERM(EventCode=4104) OR "<EventID>4104<") (TERM(attrib) OR TERM(attrib.exe)) "+h"

Stage 2: `regex`

| regex process="(?i)\s\+h\s+"

Stage 3: `table`

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

Stage 4: `bucket`

| bin span=1s

Stage 5: `stats`

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

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`EventCode`	eq	`4103` corpus 105 (splunk 105) `4104` corpus 269 (splunk 269)	`field:"EventID" kind:eq`
`process`	regex_match	`"(?i)\s+h\s+"` corpus 3 (splunk 3)	`field:"CommandLine" kind:regex_match`

Search terms

These SPL tokens match against raw event text.

Stage	Term
1	`"<EventID>4103<"`
1	`"<EventID>4104<"`
1	`attrib`
1	`attrib.exe`
1	`"+h"`