Potential Network Sniffing Activity Using Network Tools

Hunt Hypothesis

Detects potential network sniffing via use of network tools such as “tshark”, “windump”. Network sniffing refers to using the network interface on a system to monitor or capture information sent over

Detection Rule

Sigma (Original)

title: Potential Network Sniffing Activity Using Network Tools
id: ba1f7802-adc7-48b4-9ecb-81e227fddfd5
status: test
description: |
    Detects potential network sniffing via use of network tools such as "tshark", "windump".
    Network sniffing refers to using the network interface on a system to monitor or capture information sent over a wired or wireless connection.
    An adversary may place a network interface into promiscuous mode to passively access data in transit over the network, or use span ports to capture a larger amount of data.
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1040/T1040.md
author: Timur Zinniatullin, oscd.community, Nasreddine Bencherchali (Nextron Systems)
date: 2019-10-21
modified: 2023-02-20
tags:
    - attack.credential-access
    - attack.discovery
    - attack.t1040
logsource:
    category: process_creation
    product: windows
detection:
    selection_tshark:
        Image|endswith: '\tshark.exe'
        CommandLine|contains: '-i'
    selection_windump:
        Image|endswith: '\windump.exe'
    condition: 1 of selection_*
falsepositives:
    - Legitimate administration activity to troubleshoot network issues
level: medium

KQL (Azure Sentinel)

imProcessCreate
| where (TargetProcessName endswith "\\tshark.exe" and TargetProcessCommandLine contains "-i") or TargetProcessName endswith "\\windump.exe"

Required Data Sources

False Positive Guidance

• Legitimate administration activity to troubleshoot network issues

MITRE ATT&CK Context

• Tactic: Credential Access
• Tactic: Discovery
• Technique: T1040 — T1040

References

• https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1040/T1040.md
• SigmaHQ Rule