Suspicious Reconnaissance Activity Via GatherNetworkInfo.VBS

Status: test
Severity: high
Log source: category process_creation, product windows
Author: Nasreddine Bencherchali (Nextron Systems)
Source: github.com/SigmaHQ/sigma

Detects execution of the built-in script located in "C:\Windows\System32\gatherNetworkInfo.vbs". Which can be used to gather information about the target machine

MITRE ATT&CK coverage

Tactic	Techniques
Execution	`T1059.005` Command and Scripting Interpreter: Visual Basic
Discovery	`T1615` Group Policy Discovery

Telemetry coverage

Provider	Record / event type
Sysmon	Event ID 1: Process creation
Security-Auditing	Event ID 4688: A new process has been created.

Rule body

title: Suspicious Reconnaissance Activity Via GatherNetworkInfo.VBS
id: 07aa184a-870d-413d-893a-157f317f6f58
related:
    - id: f92a6f1e-a512-4a15-9735-da09e78d7273 # FileCreate
      type: similar
    - id: 575dce0c-8139-4e30-9295-1ee75969f7fe # ProcCreation LOLBIN
      type: similar
status: test
description: Detects execution of the built-in script located in "C:\Windows\System32\gatherNetworkInfo.vbs". Which can be used to gather information about the target machine
references:
    - https://posts.slayerlabs.com/living-off-the-land/#gathernetworkinfovbs
    - https://www.mandiant.com/resources/blog/trojanized-windows-installers-ukrainian-government
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-02-08
tags:
    - attack.discovery
    - attack.execution
    - attack.t1615
    - attack.t1059.005
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        CommandLine|contains: 'gatherNetworkInfo.vbs'
    filter:
        Image|endswith:
            - '\cscript.exe'
            - '\wscript.exe'
    condition: selection and not filter
falsepositives:
    - Unknown
level: high

Stages and Predicates

Stage 0: `condition`

selection and not filter

Stage 1: `selection`

selection:
    CommandLine|contains: 'gatherNetworkInfo.vbs'

Stage 2: `not filter`

filter:
    Image|endswith:
        - '\cscript.exe'
        - '\wscript.exe'

Exclusions

The rule actively suppresses these predicates.

Field	Kind	Excluded values	Search
`Image`	ends_with	`\cscript.exe`	`excludes:Image` `field:"Image" value:"\cscript.exe"`
`Image`	ends_with	`\wscript.exe`	`excludes:Image` `field:"Image" value:"\wscript.exe"`

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`CommandLine`	match	`gatherNetworkInfo.vbs` corpus 2 (sigma 2)	`field:"CommandLine" kind:match value:"gatherNetworkInfo.vbs"`