HackTool - SharpDPAPI Execution

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

Detects the execution of the SharpDPAPI tool based on CommandLine flags and PE metadata. SharpDPAPI is a C# port of some DPAPI functionality from the Mimikatz project.

MITRE ATT&CK coverage

Tactic	Techniques
Privilege Escalation	`T1134.001` Access Token Manipulation: Token Impersonation/Theft `T1134.003` Access Token Manipulation: Make and Impersonate Token
Stealth	`T1134.001` Access Token Manipulation: Token Impersonation/Theft `T1134.003` Access Token Manipulation: Make and Impersonate Token

Telemetry coverage

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

Rule body

title: HackTool - SharpDPAPI Execution
id: c7d33b50-f690-4b51-8cfb-0fb912a31e57
status: test
description: |
    Detects the execution of the SharpDPAPI tool based on CommandLine flags and PE metadata.
    SharpDPAPI is a C# port of some DPAPI functionality from the Mimikatz project.
references:
    - https://github.com/GhostPack/SharpDPAPI
author: Nasreddine Bencherchali (Nextron Systems)
date: 2024-06-26
tags:
    - attack.privilege-escalation
    - attack.stealth
    - attack.t1134.001
    - attack.t1134.003
logsource:
    product: windows
    category: process_creation
detection:
    selection_img:
        - Image|endswith: '\SharpDPAPI.exe'
        - OriginalFileName: 'SharpDPAPI.exe'
    selection_other_cli:
        CommandLine|contains:
            - ' backupkey '
            - ' blob '
            - ' certificates '
            - ' credentials '
            - ' keepass '
            - ' masterkeys '
            - ' rdg '
            - ' vaults '
    selection_other_options_guid:
        CommandLine|contains|all:
            - ' {'
            - '}:'
    selection_other_options_flags:
        CommandLine|contains:
            - ' /file:'
            - ' /machine'
            - ' /mkfile:'
            - ' /password:'
            - ' /pvk:'
            - ' /server:'
            - ' /target:'
            - ' /unprotect'
    condition: selection_img or (selection_other_cli and 1 of selection_other_options_*)
falsepositives:
    - Unknown
level: high

Stages and Predicates

Stage 0: `condition`

selection_img or (selection_other_cli and 1 of selection_other_options_*)

Stage 1: `selection_img`

selection_img:
    - Image|endswith: '\SharpDPAPI.exe'
    - OriginalFileName: 'SharpDPAPI.exe'

Stage 2: `selection_other_cli`

selection_other_cli:
    CommandLine|contains:
        - ' backupkey '
        - ' blob '
        - ' certificates '
        - ' credentials '
        - ' keepass '
        - ' masterkeys '
        - ' rdg '
        - ' vaults '

Stage 3: `selection_other_options_guid`

selection_other_options_guid:
    CommandLine|contains|all:
        - ' {'
        - '}:'

Stage 4: `selection_other_options_flags`

selection_other_options_flags:
    CommandLine|contains:
        - ' /file:'
        - ' /machine'
        - ' /mkfile:'
        - ' /password:'
        - ' /pvk:'
        - ' /server:'
        - ' /target:'
        - ' /unprotect'

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`CommandLine`	match	`/file:` `/machine` `/mkfile:` `/password:` `/pvk:` `/server:` `/target:` `/unprotect` `backupkey` `blob` `certificates` `credentials` `keepass` `masterkeys` `rdg` `vaults` `{` `}:`	`field:"CommandLine" kind:match`
`Image`	ends_with	`\SharpDPAPI.exe`	`field:"Image" kind:ends_with value:"\SharpDPAPI.exe"`
`OriginalFileName`	eq	`SharpDPAPI.exe`	`field:"OriginalFileName" kind:eq value:"SharpDPAPI.exe"`

HackTool - SharpDPAPI Execution

MITRE ATT&CK coverage

Telemetry coverage

Rule body

Stages and Predicates

Stage 0: condition

Stage 1: selection_img

Stage 2: selection_other_cli