DumpMinitool Execution

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

Detects the use of "DumpMinitool.exe" a tool that allows the dump of process memory via the use of the "MiniDumpWriteDump"

MITRE ATT&CK coverage

Tactic	Techniques
Stealth	`T1036` Masquerading
Credential Access	`T1003.001` OS Credential Dumping: LSASS Memory

Telemetry coverage

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

Rule body

title: DumpMinitool Execution
id: dee0a7a3-f200-4112-a99b-952196d81e42
status: test
description: Detects the use of "DumpMinitool.exe" a tool that allows the dump of process memory via the use of the "MiniDumpWriteDump"
references:
    - https://twitter.com/mrd0x/status/1511415432888131586
    - https://twitter.com/mrd0x/status/1511489821247684615
    - https://lolbas-project.github.io/lolbas/OtherMSBinaries/DumpMinitool/
    - https://gist.github.com/nasbench/6d58c3c125e2fa1b8f7a09754c1b087f
author: Nasreddine Bencherchali (Nextron Systems), Florian Roth (Nextron Systems)
date: 2022-04-06
modified: 2023-04-12
tags:
    - attack.stealth
    - attack.t1036
    - attack.t1003.001
    - attack.credential-access
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith:
              - '\DumpMinitool.exe'
              - '\DumpMinitool.x86.exe'
              - '\DumpMinitool.arm64.exe'
        - OriginalFileName:
              - 'DumpMinitool.exe'
              - 'DumpMinitool.x86.exe'
              - 'DumpMinitool.arm64.exe'
    selection_cli:
        CommandLine|contains:
            - ' Full'
            - ' Mini'
            - ' WithHeap'
    condition: all of selection_*
falsepositives:
    - Unknown
level: medium

Stages and Predicates

Stage 0: `condition`

all of selection_*

Stage 1: `selection_img`

selection_img:
    - Image|endswith:
          - '\DumpMinitool.exe'
          - '\DumpMinitool.x86.exe'
          - '\DumpMinitool.arm64.exe'
    - OriginalFileName:
          - 'DumpMinitool.exe'
          - 'DumpMinitool.x86.exe'
          - 'DumpMinitool.arm64.exe'

Stage 2: `selection_cli`

selection_cli:
    CommandLine|contains:
        - ' Full'
        - ' Mini'
        - ' WithHeap'

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`CommandLine`	match	`Full` corpus 3 (sigma 3) `Mini` corpus 2 (sigma 2) `WithHeap` corpus 2 (sigma 2)	`field:"CommandLine" kind:match`
`Image`	ends_with	`\DumpMinitool.arm64.exe` corpus 2 (sigma 2) `\DumpMinitool.exe` corpus 2 (sigma 2) `\DumpMinitool.x86.exe` corpus 2 (sigma 2)	`field:"Image" kind:ends_with`
`OriginalFileName`	eq	`DumpMinitool.arm64.exe` corpus 2 (sigma 2) `DumpMinitool.exe` corpus 4 (sigma 2, elastic 2) `DumpMinitool.x86.exe` corpus 2 (sigma 2)	`field:"OriginalFileName" kind:eq`

DumpMinitool Execution

MITRE ATT&CK coverage

Telemetry coverage

Rule body

Stages and Predicates

Stage 0: condition

Stage 1: selection_img

Stage 2: selection_cli

Indicators

Stage 0: `condition`

Stage 1: `selection_img`

Stage 2: `selection_cli`