Renamed Msdt.EXE Execution

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

Detects the execution of a renamed "Msdt.exe" binary

Known false positives

Unlikely

MITRE ATT&CK coverage

Tactic	Techniques
Stealth	`T1036.003` Masquerading: Rename Legitimate Utilities

Telemetry coverage

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

Rule body

title: Renamed Msdt.EXE Execution
id: bd1c6866-65fc-44b2-be51-5588fcff82b9
status: test
description: Detects the execution of a renamed "Msdt.exe" binary
references:
    - https://lolbas-project.github.io/lolbas/Binaries/Msdt/
author: pH-T (Nextron Systems)
date: 2022-06-03
modified: 2023-02-03
tags:
    - attack.stealth
    - attack.t1036.003
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        OriginalFileName: 'msdt.exe'
    filter:
        Image|endswith: '\msdt.exe'
    condition: selection and not filter
falsepositives:
    - Unlikely
level: high
regression_tests_path: regression_data/rules/windows/process_creation/proc_creation_win_renamed_msdt/info.yml

Stages and Predicates

Stage 0: `condition`

selection and not filter

Stage 1: `selection`

selection:
    OriginalFileName: 'msdt.exe'

Stage 2: `not filter`

filter:
    Image|endswith: '\msdt.exe'

Exclusions

The rule actively suppresses these predicates.

Field	Kind	Excluded values	Search
`Image`	ends_with	`\msdt.exe`	`excludes:Image` `field:"Image" value:"\msdt.exe"`

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`OriginalFileName`	eq	`msdt.exe` corpus 10 (sigma 6, elastic 4)	`field:"OriginalFileName" kind:eq value:"msdt.exe"`

Renamed Msdt.EXE Execution

Known false positives

MITRE ATT&CK coverage

Telemetry coverage

Rule body

Stages and Predicates

Stage 0: condition

Stage 1: selection

Stage 2: not filter

Exclusions

Indicators

Stage 0: `condition`

Stage 1: `selection`

Stage 2: `not filter`