title: Suspect Svchost Memory Asccess
id: 166e9c50-8cd9-44af-815d-d1f0c0e90dde
status: experimental
description: Detects suspect access to svchost process memory such as that used by Invoke-Phantom to kill the winRM windows event logging service.
references:
    - https://github.com/hlldz/Invoke-Phant0m
    - https://twitter.com/timbmsft/status/900724491076214784
author: Tim Burrell
date: 2020/01/02
modified: 2022/11/01
tags:
    - attack.defense_evasion
    - attack.t1562.002
logsource:
    category: process_access
    product: windows
detection:
    selection:
        TargetImage|endswith: '\WINDOWS\System32\svchost.exe'
        GrantedAccess: '0x1F3FFF'
        CallTrace|contains: 'UNKNOWN'
    filter_msbuild:
        SourceImage|startswith: 'C:\Program Files\Microsoft Visual Studio\'
        SourceImage|endswith: '\MSBuild\Current\Bin\MSBuild.exe'
        # Just to make sure it's "really" .NET :)
        CallTrace|contains:
            - 'Microsoft.Build.ni.dll'
            - 'System.ni.dll'
    condition: selection and not 1 of filter_*
falsepositives:
    - Unknown
level: high