HackTool - Certify Execution

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

Detects Certify a tool for Active Directory certificate abuse based on PE metadata characteristics and common command line arguments.

MITRE ATT&CK coverage

Tactic	Techniques
Credential Access	`T1649` Steal or Forge Authentication Certificates

Telemetry coverage

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

Rule body

title: HackTool - Certify Execution
id: 762f2482-ff21-4970-8939-0aa317a886bb
status: test
description: Detects Certify a tool for Active Directory certificate abuse based on PE metadata characteristics and common command line arguments.
references:
    - https://github.com/GhostPack/Certify
author: pH-T (Nextron Systems)
date: 2023-04-17
modified: 2023-04-25
tags:
    - attack.discovery
    - attack.credential-access
    - attack.t1649
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith: '\Certify.exe'
        - OriginalFileName: 'Certify.exe'
        - Description|contains: 'Certify'
    selection_cli_commands:
        CommandLine|contains:
            - '.exe cas '
            - '.exe find '
            - '.exe pkiobjects '
            - '.exe request '
            - '.exe download '
    selection_cli_options:
        CommandLine|contains:
            - ' /vulnerable'
            - ' /template:'
            - ' /altname:'
            - ' /domain:'
            - ' /path:'
            - ' /ca:'
    condition: selection_img or all of selection_cli_*
falsepositives:
    - Unknown
level: high

Stages and Predicates

Stage 0: `condition`

selection_img or all of selection_cli_*

Stage 1: `selection_img`

selection_img:
    - Image|endswith: '\Certify.exe'
    - OriginalFileName: 'Certify.exe'
    - Description|contains: 'Certify'

Stage 2: `selection_cli_commands`

selection_cli_commands:
    CommandLine|contains:
        - '.exe cas '
        - '.exe find '
        - '.exe pkiobjects '
        - '.exe request '
        - '.exe download '

Stage 3: `selection_cli_options`

selection_cli_options:
    CommandLine|contains:
        - ' /vulnerable'
        - ' /template:'
        - ' /altname:'
        - ' /domain:'
        - ' /path:'
        - ' /ca:'

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`CommandLine`	match	`/altname:` `/ca:` `/domain:` `/path:` `/template:` `/vulnerable` `.exe cas` `.exe download` `.exe find` `.exe pkiobjects` `.exe request`	`field:"CommandLine" kind:match`
`Description`	match	`Certify`	`field:"Description" kind:match value:"Certify"`
`Image`	ends_with	`\Certify.exe`	`field:"Image" kind:ends_with value:"\Certify.exe"`
`OriginalFileName`	eq	`Certify.exe`	`field:"OriginalFileName" kind:eq value:"Certify.exe"`

HackTool - Certify Execution

MITRE ATT&CK coverage

Telemetry coverage

Rule body

Stages and Predicates

Stage 0: condition

Stage 1: selection_img

Stage 2: selection_cli_commands

Stage 3: selection_cli_options

Indicators

Stage 0: `condition`

Stage 1: `selection_img`

Stage 2: `selection_cli_commands`

Stage 3: `selection_cli_options`