PowerShell ICMP Exfiltration — Sigma Rule

Rule metadata and linked tags

Author: Bartlomiej Czyz @bczyz1, oscd.community. Source status: test; severity: medium. Source dates: 2020-10-10 / 2022-12-25.

{
  "product": "windows",
  "category": "ps_script",
  "definition": "Requirements: Script Block Logging must be enabled"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 53d84dc0ff8ff03d918be95c608070d5e919d036e32d02f9297ad343e595d7ff

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: PowerShell ICMP Exfiltration
id: 4c4af3cd-2115-479c-8193-6b8bfce9001c
status: test
description: Detects Exfiltration Over Alternative Protocol - ICMP. Adversaries may steal data by exfiltrating it over an un-encrypted network protocol other than that of the existing command and control channel.
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1048.003/T1048.003.md#atomic-test-2---exfiltration-over-alternative-protocol---icmp
author: 'Bartlomiej Czyz @bczyz1, oscd.community'
date: 2020-10-10
modified: 2022-12-25
tags:
    - attack.exfiltration
    - attack.t1048.003
logsource:
    product: windows
    category: ps_script
    definition: 'Requirements: Script Block Logging must be enabled'
detection:
    selection:
        ScriptBlockText|contains|all:
            - 'New-Object'
            - 'System.Net.NetworkInformation.Ping'
            - '.Send('
    condition: selection
falsepositives:
    - Legitimate usage of System.Net.NetworkInformation.Ping class
level: medium

Original YAML and metadata in JSON

False positives

• Legitimate usage of System.Net.NetworkInformation.Ping class

Source references

• https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1048.003/T1048.003.md#atomic-test-2---exfiltration-over-alternative-protocol---icmp