Net.EXE Execution

Status: test
Severity: low
Log source: category process_creation, product windows
Author: Michael Haag, Mark Woan (improvements), James Pemberton / @4A616D6573 / oscd.community (improvements)
Source: github.com/SigmaHQ/sigma

Detects execution of "Net.EXE".

Known false positives

Likely

MITRE ATT&CK coverage

Tactic	Techniques
Discovery	`T1007` System Service Discovery `T1018` Remote System Discovery `T1049` System Network Connections Discovery `T1069.001` Permission Groups Discovery: Local Groups `T1069.002` Permission Groups Discovery: Domain Groups `T1087.001` Account Discovery: Local Account `T1087.002` Account Discovery: Domain Account `T1135` Network Share Discovery `T1201` Password Policy Discovery
Lateral Movement	`T1021.002` Remote Services: SMB/Windows Admin Shares

Telemetry coverage

Provider	Record / event type
Sysmon	Event ID 1: Process creation

Rule body

title: Net.EXE Execution
id: 183e7ea8-ac4b-4c23-9aec-b3dac4e401ac
status: test
description: Detects execution of "Net.EXE".
references:
    - https://pentest.blog/windows-privilege-escalation-methods-for-pentesters/
    - https://eqllib.readthedocs.io/en/latest/analytics/4d2e7fc1-af0b-4915-89aa-03d25ba7805e.html
    - https://eqllib.readthedocs.io/en/latest/analytics/e61f557c-a9d0-4c25-ab5b-bbc46bb24deb.html
    - https://eqllib.readthedocs.io/en/latest/analytics/9b3dd402-891c-4c4d-a662-28947168ce61.html
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1007/T1007.md#atomic-test-2---system-service-discovery---netexe
author: Michael Haag, Mark Woan (improvements), James Pemberton / @4A616D6573 / oscd.community (improvements)
date: 2019-01-16
modified: 2022-07-11
tags:
    - attack.discovery
    - attack.t1007
    - attack.t1049
    - attack.t1018
    - attack.t1135
    - attack.t1201
    - attack.t1069.001
    - attack.t1069.002
    - attack.t1087.001
    - attack.t1087.002
    - attack.lateral-movement
    - attack.t1021.002
    - attack.s0039
    - detection.threat-hunting
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith:
              - '\net.exe'
              - '\net1.exe'
        - OriginalFileName:
              - 'net.exe'
              - 'net1.exe'
    selection_cli:
        CommandLine|contains:
            - ' accounts'
            - ' group'
            - ' localgroup'
            - ' share'
            - ' start'
            - ' stop '
            - ' user'
            - ' view'
    condition: all of selection_*
falsepositives:
    - Likely
level: low

Stages and Predicates

Stage 0: `condition`

all of selection_*

Stage 1: `selection_img`

selection_img:
    - Image|endswith:
          - '\net.exe'
          - '\net1.exe'
    - OriginalFileName:
          - 'net.exe'
          - 'net1.exe'

Stage 2: `selection_cli`

selection_cli:
    CommandLine|contains:
        - ' accounts'
        - ' group'
        - ' localgroup'
        - ' share'
        - ' start'
        - ' stop '
        - ' user'
        - ' view'

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`CommandLine`	match	`accounts` `group` corpus 2 (sigma 2) `localgroup` `share` `start` corpus 2 (sigma 1, splunk 1) `stop` corpus 8 (sigma 6, splunk 2) `user` corpus 2 (sigma 1, splunk 1) `view` corpus 2 (sigma 2)	`field:"CommandLine" kind:match`
`Image`	ends_with	`\net.exe` corpus 49 (sigma 49) `\net1.exe` corpus 47 (sigma 47)	`field:"Image" kind:ends_with`
`OriginalFileName`	eq	`net.exe` corpus 31 (sigma 19, elastic 10, splunk 2) `net1.exe` corpus 44 (sigma 19, splunk 19, elastic 6)	`field:"OriginalFileName" kind:eq`

Net.EXE Execution

Known false positives

MITRE ATT&CK coverage

Telemetry coverage

Rule body

Stages and Predicates

Stage 0: condition

Stage 1: selection_img

Stage 2: selection_cli

Indicators

Stage 0: `condition`

Stage 1: `selection_img`

Stage 2: `selection_cli`