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Detection rules › Sigma

PowerShell ICMP Exfiltration

Status
test
Severity
medium
Log source
product windows, category ps_script
Author
Bartlomiej Czyz @bczyz1, oscd.community
Source
github.com/SigmaHQ/sigma

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.

MITRE ATT&CK coverage

TacticTechniques
ExfiltrationT1048.003 Exfiltration Over Alternative Protocol: Exfiltration Over Unencrypted Non-C2 Protocol

Event coverage

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

Rule body yaml

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

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    ScriptBlockText|contains|all:
        - 'New-Object'
        - 'System.Net.NetworkInformation.Ping'
        - '.Send('

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
  • .Send(
  • New-Object corpus 8 (sigma 7, splunk 1)
  • System.Net.NetworkInformation.Ping