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Detection rules › Sigma

Pubprn.vbs Proxy Execution

Status
test
Severity
medium
Log source
category process_creation, product windows
Author
frack113
Source
github.com/SigmaHQ/sigma

Detects the use of the 'Pubprn.vbs' Microsoft signed script to execute commands.

MITRE ATT&CK coverage

TacticTechniques
Stealth

Telemetry coverage

ProviderRecord / event type
SysmonEvent ID 1: Process creation
Security-AuditingEvent ID 4688: A new process has been created.

Rule body

title: Pubprn.vbs Proxy Execution
id: 1fb76ab8-fa60-4b01-bddd-71e89bf555da
status: test
description: Detects the use of the 'Pubprn.vbs' Microsoft signed script to execute commands.
references:
    - https://lolbas-project.github.io/lolbas/Scripts/Pubprn/
author: frack113
date: 2022-05-28
tags:
    - attack.stealth
    - attack.t1216.001
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        CommandLine|contains|all:
            - '\pubprn.vbs'
            - 'script:'
    condition: selection
falsepositives:
    - Unknown
level: medium

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    CommandLine|contains|all:
        - '\pubprn.vbs'
        - 'script:'

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
CommandLinematch
  • \pubprn.vbs
  • script:
field:"CommandLine" kind:match