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Detection rules › Sigma

Detected Windows Software Discovery - PowerShell

Status
test
Severity
medium
Log source
product windows, category ps_script
Author
Nikita Nazarov, oscd.community
Source
github.com/SigmaHQ/sigma

Adversaries may attempt to enumerate software for a variety of reasons, such as figuring out what security measures are present or if the compromised system has a version of software that is vulnerable.

MITRE ATT&CK coverage

TacticTechniques
DiscoveryT1518 Software Discovery

Event coverage

ProviderEventTitle
PowerShellEvent ID 4104Creating Scriptblock text (MessageNumber of MessageTotal).

Rule body yaml

title: Detected Windows Software Discovery - PowerShell
id: 2650dd1a-eb2a-412d-ac36-83f06c4f2282
status: test
description: Adversaries may attempt to enumerate software for a variety of reasons, such as figuring out what security measures are present or if the compromised system has a version of software that is vulnerable.
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1518/T1518.md
    - https://github.com/harleyQu1nn/AggressorScripts # AVQuery.cna
author: Nikita Nazarov, oscd.community
date: 2020-10-16
modified: 2022-12-02
tags:
    - attack.discovery
    - attack.t1518
logsource:
    product: windows
    category: ps_script
    definition: 'Requirements: Script Block Logging must be enabled'
detection:
    selection:
        ScriptBlockText|contains|all:
            # Example: Get-ItemProperty HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\* | Select-Object DisplayName, DisplayVersion, Publisher, InstallDate | Format-Table -Autosize
            - 'get-itemProperty'
            - '\software\'
            - 'select-object'
            - 'format-table'
    condition: selection
falsepositives:
    - Legitimate administration activities
level: medium

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    ScriptBlockText|contains|all:
        - 'get-itemProperty'
        - '\software\'
        - 'select-object'
        - 'format-table'

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.

FieldKindValues
ScriptBlockTextmatch
  • \software\
  • format-table
  • get-itemProperty corpus 2 (sigma 2)
  • select-object