Detection rules › Sigma
Email Exifiltration Via Powershell
Detects email exfiltration via powershell cmdlets
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Exfiltration | No specific technique |
Event coverage
| Provider | Event | Title |
|---|---|---|
| Sysmon | Event ID 1 | Process creation |
| Security-Auditing | Event ID 4688 | A new process has been created. |
Rule body yaml
title: Email Exifiltration Via Powershell
id: 312d0384-401c-4b8b-abdf-685ffba9a332
status: test
description: Detects email exfiltration via powershell cmdlets
references:
- https://www.microsoft.com/security/blog/2022/09/07/profiling-dev-0270-phosphorus-ransomware-operations/
- https://github.com/Azure/Azure-Sentinel/blob/7e6aa438e254d468feec061618a7877aa528ee9f/Hunting%20Queries/Microsoft%20365%20Defender/Ransomware/DEV-0270/Email%20data%20exfiltration%20via%20PowerShell.yaml
author: Nasreddine Bencherchali (Nextron Systems), Azure-Sentinel (idea)
date: 2022-09-09
tags:
- attack.exfiltration
logsource:
category: process_creation
product: windows
detection:
selection:
Image|endswith:
- '\powershell.exe'
- '\pwsh.exe'
CommandLine|contains|all:
- 'Add-PSSnapin'
- 'Get-Recipient'
- '-ExpandProperty'
- 'EmailAddresses'
- 'SmtpAddress'
- '-hidetableheaders'
condition: selection
falsepositives:
- Unknown
level: high
Stages and Predicates
Stage 0: condition
selectionStage 1: selection
selection:
Image|endswith:
- '\powershell.exe'
- '\pwsh.exe'
CommandLine|contains|all:
- 'Add-PSSnapin'
- 'Get-Recipient'
- '-ExpandProperty'
- 'EmailAddresses'
- 'SmtpAddress'
- '-hidetableheaders'
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.
| Field | Kind | Values |
|---|---|---|
CommandLine | match |
|
Image | ends_with |
|