Detectionhightest

NTFS Alternate Data Stream

Detects writing data into NTFS alternate data streams from powershell. Needs Script Block Logging.

Convert In Phoenix Studio

Open this Sigma rule in the converter with the YAML preloaded and ready for backend selection.

Launch

Sami RuohonenCreated Tue Jul 24Updated Sun Dec 258c521530-5169-495d-a199-0a3a881ad24ewindows

Log Source

WindowsPowerShell Script

ProductWindows← raw: windows

CategoryPowerShell Script← raw: ps_script

Definition

Requirements: Script Block Logging must be enabled

Detection Logic

detection:
    selection_content:
        ScriptBlockText|contains:
            - set-content
            - add-content
    selection_stream:
        ScriptBlockText|contains: '-stream'
    condition: all of selection*

False Positives

Unknown

False positive likelihood has not been assessed. Additional context may be needed during triage.

References

MITRE ATT&CK

Tactics

TA0005 · Defense Evasion TA0002 · Execution

Sub-techniques

T1564.004 · NTFS File Attributes T1059.001 · PowerShell

Rule Metadata

Rule ID

8c521530-5169-495d-a199-0a3a881ad24e

Status

test

Level

high

Type

Detection

Created

Tue Jul 24

Modified

Sun Dec 25

Author

Sami Ruohonen

Path

rules/windows/powershell/powershell_script/posh_ps_ntfs_ads_access.yml

Raw Tags

attack.defense-evasionattack.t1564.004attack.executionattack.t1059.001

View on GitHub