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Detection rules › Sigma

Recon Information for Export with PowerShell

Status
test
Severity
medium
Log source
category ps_script, product windows
Author
frack113
Source
github.com/SigmaHQ/sigma

Once established within a system or network, an adversary may use automated techniques for collecting internal data

MITRE ATT&CK coverage

TacticTechniques
Collection

Telemetry coverage

ProviderRecord / event type
PowerShellEvent ID 4104: Creating Scriptblock text (MessageNumber of MessageTotal).

Rule body

title: Recon Information for Export with PowerShell
id: a9723fcc-881c-424c-8709-fd61442ab3c3
status: test
description: Once established within a system or network, an adversary may use automated techniques for collecting internal data
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1119/T1119.md
author: frack113
date: 2021-07-30
modified: 2022-12-25
tags:
    - attack.collection
    - attack.t1119
logsource:
    product: windows
    category: ps_script
    definition: 'Requirements: Script Block Logging must be enabled'
detection:
    selection_action:
        ScriptBlockText|contains:
            - 'Get-Service '
            - 'Get-ChildItem '
            - 'Get-Process '
    selection_redirect:
        ScriptBlockText|contains: '> $env:TEMP\'
    condition: all of selection*
falsepositives:
    - Unknown
level: medium

Stages and Predicates

Stage 0: condition

all of selection*

Stage 1: selection_action

selection_action:
    ScriptBlockText|contains:
        - 'Get-Service '
        - 'Get-ChildItem '
        - 'Get-Process '

Stage 2: selection_redirect

selection_redirect:
    ScriptBlockText|contains: '> $env:TEMP\'

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
ScriptBlockTextmatch
  • > $env:TEMP\
  • Get-ChildItem
  • Get-Process
  • Get-Service
field:"ScriptBlockText" kind:match