Share And Session Enumeration Using Net.EXE — Sigma Rule

Rule metadata and linked tags

Author: Endgame, JHasenbusch (ported for oscd.community). Source status: stable; severity: low. Source dates: 2018-10-30 / 2023-02-21.

{
  "category": "process_creation",
  "product": "windows"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 46d7533fce00b99829f510a7b9f464315b6b1bf1316c951e016cf8cd54200a1f

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: Share And Session Enumeration Using Net.EXE
id: 62510e69-616b-4078-b371-847da438cc03
status: stable
description: Detects attempts to enumerate file shares, printer shares and sessions using "net.exe" with the "view" flag.
references:
    - https://eqllib.readthedocs.io/en/latest/analytics/b8a94d2f-dc75-4630-9d73-1edc6bd26fff.html
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1018/T1018.md
author: Endgame, JHasenbusch (ported for oscd.community)
date: 2018-10-30
modified: 2023-02-21
tags:
    - attack.discovery
    - attack.t1018
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith:
              - '\net.exe'
              - '\net1.exe'
        - OriginalFileName:
              - 'net.exe'
              - 'net1.exe'
    selection_cli:
        CommandLine|contains: 'view'
    filter:
        CommandLine|contains: '\\\\'
    condition: all of selection_* and not filter
falsepositives:
    - Legitimate use of net.exe utility by legitimate user
level: low

Original YAML and metadata in JSON

False positives

• Legitimate use of net.exe utility by legitimate user

Source references

• https://eqllib.readthedocs.io/en/latest/analytics/b8a94d2f-dc75-4630-9d73-1edc6bd26fff.html
• https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1018/T1018.md