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Detection rules › Sigma

Powershell Local Email Collection

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

Adversaries may target user email on local systems to collect sensitive information. Files containing email data can be acquired from a users local system, such as Outlook storage or cache files.

MITRE ATT&CK coverage

TacticTechniques
CollectionT1114.001 Email Collection: Local Email Collection

Event coverage

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

Rule body yaml

title: Powershell Local Email Collection
id: 2837e152-93c8-43d2-85ba-c3cd3c2ae614
status: test
description: |
    Adversaries may target user email on local systems to collect sensitive information.
    Files containing email data can be acquired from a users local system, such as Outlook storage or cache files.
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1114.001/T1114.001.md
author: frack113
date: 2021-07-21
modified: 2022-12-25
tags:
    - attack.collection
    - attack.t1114.001
logsource:
    product: windows
    category: ps_script
    definition: 'Requirements: Script Block Logging must be enabled'
detection:
    selection:
        ScriptBlockText|contains:
            - 'Get-Inbox.ps1'
            - 'Microsoft.Office.Interop.Outlook'
            - 'Microsoft.Office.Interop.Outlook.olDefaultFolders'
            - '-comobject outlook.application'
    condition: selection
falsepositives:
    - Unknown
level: medium

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    ScriptBlockText|contains:
        - 'Get-Inbox.ps1'
        - 'Microsoft.Office.Interop.Outlook'
        - 'Microsoft.Office.Interop.Outlook.olDefaultFolders'
        - '-comobject outlook.application'

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
  • -comobject outlook.application
  • Get-Inbox.ps1
  • Microsoft.Office.Interop.Outlook
  • Microsoft.Office.Interop.Outlook.olDefaultFolders