Suspicious Scan Loop Network

Hunt Hypothesis

Adversaries may attempt to get a listing of other systems by IP address, hostname, or other logical identifier on a network that may be used for Lateral Movement from the current system

Detection Rule

Sigma (Original)

title: Suspicious Scan Loop Network
id: f8ad2e2c-40b6-4117-84d7-20b89896ab23
status: test
description: Adversaries may attempt to get a listing of other systems by IP address, hostname, or other logical identifier on a network that may be used for Lateral Movement from the current system
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1018/T1018.md
    - https://ss64.com/nt/for.html
    - https://ss64.com/ps/foreach-object.html
author: frack113
date: 2022-03-12
tags:
    - attack.execution
    - attack.t1059
    - attack.discovery
    - attack.t1018
logsource:
    category: process_creation
    product: windows
detection:
    selection_loop:
        CommandLine|contains:
            - 'for '
            - 'foreach '
    selection_tools:
        CommandLine|contains:
            - 'nslookup'
            - 'ping'
    condition: all of selection_*
falsepositives:
    - Legitimate script
level: medium

KQL (Azure Sentinel)

imProcessCreate
| where (TargetProcessCommandLine contains "for " or TargetProcessCommandLine contains "foreach ") and (TargetProcessCommandLine contains "nslookup" or TargetProcessCommandLine contains "ping")

Required Data Sources

False Positive Guidance

• Legitimate script

MITRE ATT&CK Context

• Tactic: Execution
• Tactic: Discovery
• Technique: T1059 — Command and Scripting Interpreter
• Technique: T1018 — T1018

References

• https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1018/T1018.md
• https://ss64.com/nt/for.html
• https://ss64.com/ps/foreach-object.html
• SigmaHQ Rule