Renamed Mavinject.EXE Execution

Status: test
Severity: high
Log source: category process_creation, product windows
Author: frack113, Florian Roth
Source: github.com/SigmaHQ/sigma

Detects the execution of a renamed version of the "Mavinject" process. Which can be abused to perform process injection using the "/INJECTRUNNING" flag

Known false positives

Unlikely

MITRE ATT&CK coverage

Tactic	Techniques
Privilege Escalation	`T1055.001` Process Injection: Dynamic-link Library Injection
Stealth	`T1055.001` Process Injection: Dynamic-link Library Injection `T1218.013` System Binary Proxy Execution: Mavinject

Telemetry coverage

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

Rule body

title: Renamed Mavinject.EXE Execution
id: e6474a1b-5390-49cd-ab41-8d88655f7394
status: test
description: Detects the execution of a renamed version of the "Mavinject" process. Which can be abused to perform process injection using the "/INJECTRUNNING" flag
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1218/T1218.md
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1056.004/T1056.004.md
    - https://posts.specterops.io/mavinject-exe-functionality-deconstructed-c29ab2cf5c0e
    - https://twitter.com/gN3mes1s/status/941315826107510784
    - https://reaqta.com/2017/12/mavinject-microsoft-injector/
    - https://twitter.com/Hexacorn/status/776122138063409152  # Deleted tweet
    - https://github.com/SigmaHQ/sigma/issues/3742
    - https://github.com/keyboardcrunch/SentinelOne-ATTACK-Queries/blob/6a228d23eefe963ca81f2d52f94b815f61ef5ee0/Tactics/DefenseEvasion.md#t1055-process-injection
author: frack113, Florian Roth
date: 2022-12-05
modified: 2023-02-03
tags:
    - attack.privilege-escalation
    - attack.stealth
    - attack.t1055.001
    - attack.t1218.013
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        OriginalFileName:
            - 'mavinject32.exe'
            - 'mavinject64.exe'
    filter:
        Image|endswith:
            - '\mavinject32.exe'
            - '\mavinject64.exe'
    condition: selection and not filter
falsepositives:
    - Unlikely
level: high

Stages and Predicates

Stage 0: `condition`

selection and not filter

Stage 1: `selection`

selection:
    OriginalFileName:
        - 'mavinject32.exe'
        - 'mavinject64.exe'

Stage 2: `not filter`

filter:
    Image|endswith:
        - '\mavinject32.exe'
        - '\mavinject64.exe'

Exclusions

The rule actively suppresses these predicates.

Field	Kind	Excluded values	Search
`Image`	ends_with	`\mavinject32.exe`	`excludes:Image` `field:"Image" value:"\mavinject32.exe"`
`Image`	ends_with	`\mavinject64.exe`	`excludes:Image` `field:"Image" value:"\mavinject64.exe"`

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`OriginalFileName`	eq	`mavinject32.exe` `mavinject64.exe`	`field:"OriginalFileName" kind:eq`