HackTool - WinPwn Execution - ScriptBlock

Status: test
Severity: high
Log source: category ps_script, product windows
Author: Swachchhanda Shrawan Poudel
Source: github.com/SigmaHQ/sigma

Detects scriptblock text keywords indicative of potential usge of the tool WinPwn. A tool for Windows and Active Directory reconnaissance and exploitation.

Known false positives

As the script block is a blob of text. False positive may occur with scripts that contain the keyword as a reference or simply use it for detection.

MITRE ATT&CK coverage

Tactic	Techniques
Execution	`T1106` Native API
Privilege Escalation	`T1548.002` Abuse Elevation Control Mechanism: Bypass User Account Control
Credential Access	`T1552.001` Unsecured Credentials: Credentials In Files `T1555.003` Credentials from Password Stores: Credentials from Web Browsers
Discovery	`T1046` Network Service Discovery `T1082` System Information Discovery `T1518` Software Discovery

Telemetry coverage

Provider	Record / event type
PowerShell	Event ID 4104: Creating Scriptblock text (MessageNumber of MessageTotal).

Rule body

title: HackTool - WinPwn Execution - ScriptBlock
id: 851fd622-b675-4d26-b803-14bc7baa517a
related:
    - id: d557dc06-62e8-4468-a8e8-7984124908ce
      type: similar
status: test
description: |
    Detects scriptblock text keywords indicative of potential usge of the tool WinPwn. A tool for Windows and Active Directory reconnaissance and exploitation.
author: Swachchhanda Shrawan Poudel
date: 2023-12-04
references:
    - https://github.com/S3cur3Th1sSh1t/WinPwn
    - https://www.publicnow.com/view/EB87DB49C654D9B63995FAD4C9DE3D3CC4F6C3ED?1671634841
    - https://reconshell.com/winpwn-tool-for-internal-windows-pentesting-and-ad-security/
    - https://github.com/redcanaryco/atomic-red-team/blob/4d6c4e8e23d465af7a2388620cfe3f8c76e16cf0/atomics/T1082/T1082.md
    - https://grep.app/search?q=winpwn&filter[repo][0]=redcanaryco/atomic-red-team
tags:
    - attack.credential-access
    - attack.discovery
    - attack.execution
    - attack.privilege-escalation
    - attack.t1046
    - attack.t1082
    - attack.t1106
    - attack.t1518
    - attack.t1548.002
    - attack.t1552.001
    - attack.t1555
    - attack.t1555.003
logsource:
    category: ps_script
    product: windows
    definition: 'Requirements: Script Block Logging must be enabled'
detection:
    selection:
        ScriptBlockText|contains:
            - 'Offline_Winpwn'
            - 'WinPwn '
            - 'WinPwn.exe'
            - 'WinPwn.ps1'
    condition: selection
falsepositives:
    - As the script block is a blob of text. False positive may occur with scripts that contain the keyword as a reference or simply use it for detection.
level: high

Stages and Predicates

Stage 0: `condition`

selection

Stage 1: `selection`

selection:
    ScriptBlockText|contains:
        - 'Offline_Winpwn'
        - 'WinPwn '
        - 'WinPwn.exe'
        - 'WinPwn.ps1'

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`ScriptBlockText`	match	`Offline_Winpwn` `WinPwn` `WinPwn.exe` `WinPwn.ps1`	`field:"ScriptBlockText" kind:match`