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Detection rules › Sigma

DumpMinitool Execution

Status
test
Severity
medium
Log source
product windows, category process_creation
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

TacticTechniques
StealthT1036 Masquerading
Credential AccessT1003.001 OS Credential Dumping: LSASS Memory

Event coverage

ProviderEventTitle
SysmonEvent ID 1Process creation

Rule body yaml

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

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

FieldKindValues
CommandLinematch
  • Full corpus 3 (sigma 3)
  • Mini corpus 2 (sigma 2)
  • WithHeap corpus 2 (sigma 2)
Imageends_with
  • \DumpMinitool.arm64.exe corpus 2 (sigma 2)
  • \DumpMinitool.exe corpus 2 (sigma 2)
  • \DumpMinitool.x86.exe corpus 2 (sigma 2)
OriginalFileNameeq
  • DumpMinitool.arm64.exe corpus 2 (sigma 2)
  • DumpMinitool.exe corpus 2 (sigma 2)
  • DumpMinitool.x86.exe corpus 2 (sigma 2)