Suspicious Svchost Process Access

calendar Aug 12, 2024 · attack.defense-evasion attack.t1562.002  ·
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Detects suspicious access to the "svchost" process such as that used by Invoke-Phantom to kill the thread of the Windows event logging service.

Sigma rule (View on GitHub)

 1title: Suspicious Svchost Process Access
 2id: 166e9c50-8cd9-44af-815d-d1f0c0e90dde
 3status: test
 4description: Detects suspicious access to the "svchost" process such as that used by Invoke-Phantom to kill the thread of the Windows event logging service.
 5references:
 6    - https://github.com/hlldz/Invoke-Phant0m
 7    - https://twitter.com/timbmsft/status/900724491076214784
 8author: Tim Burrell
 9date: 2020-01-02
10modified: 2023-01-30
11tags:
12    - attack.defense-evasion
13    - attack.t1562.002
14logsource:
15    category: process_access
16    product: windows
17detection:
18    selection:
19        TargetImage|endswith: ':\Windows\System32\svchost.exe'
20        GrantedAccess: '0x1F3FFF'
21        CallTrace|contains: 'UNKNOWN'
22    filter_main_msbuild:
23        SourceImage|contains: ':\Program Files\Microsoft Visual Studio\'
24        SourceImage|endswith: '\MSBuild\Current\Bin\MSBuild.exe'
25        # Just to make sure it's "really" .NET :)
26        CallTrace|contains:
27            - 'Microsoft.Build.ni.dll'
28            - 'System.ni.dll'
29    condition: selection and not 1 of filter_main_*
30falsepositives:
31    - Unknown
32level: high

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