Potential Packet Capture Activity Via Start-NetEventSession - ScriptBlock

Title: Potential Packet Capture Activity Via Start-NetEventSession - ScriptBlock
Status: test
Description:Detects the execution of powershell scripts with calls to the "Start-NetEventSession" cmdlet. Which allows an attacker to start event and packet capture for a network event session. Adversaries may attempt to capture network to gather information over the course of an operation. Data captured via this technique may include user credentials, especially those sent over an insecure, unencrypted protocol.
References:
  -https://github.com/redcanaryco/atomic-red-team/blob/5f866ca4517e837c4ea576e7309d0891e78080a8/atomics/T1040/T1040.md#atomic-test-16---powershell-network-sniffing
  -https://github.com/0xsyr0/Awesome-Cybersecurity-Handbooks/blob/7b8935fe4c82cb64d61343de1a8b2e38dd968534/handbooks/10_post_exploitation.md
  -https://github.com/forgottentq/powershell/blob/9e616363d497143dc955c4fdce68e5c18d28a6cb/captureWindows-Endpoint.ps1#L13
Author: frack113
Date: 2024-05-12
modified:None
Tags:

• -'attack.credential-access'
• -'attack.discovery'
• -'attack.t1040'

Logsource:

• product: windows
• category: ps_script
• definition: Requirements: Script Block Logging must be enabled

Detection:
  selection:
    ScriptBlockText|contains: 'Start-NetEventSession'
  condition:selection
Falsepositives:
  -Legitimate network diagnostic scripts.
Level: medium