Suspect Svchost Activity

 1title: Suspect Svchost Activity
 2id: 16c37b52-b141-42a5-a3ea-bbe098444397
 3status: test
 4description: It is extremely abnormal for svchost.exe to spawn without any CLI arguments and is normally observed when a malicious process spawns the process and injects code into the process memory space.
 5references:
 6    - https://securitybytes.io/blue-team-fundamentals-part-two-windows-processes-759fe15965e2
 7author: David Burkett, @signalblur
 8date: 2019/12/28
 9modified: 2022/06/27
10tags:
11    - attack.defense_evasion
12    - attack.privilege_escalation
13    - attack.t1055
14logsource:
15    category: process_creation
16    product: windows
17detection:
18    selection:
19        CommandLine|endswith: 'svchost.exe'
20        Image|endswith: '\svchost.exe'
21    filter:
22        - ParentImage|endswith:
23              - '\rpcnet.exe'
24              - '\rpcnetp.exe'
25        - CommandLine: null  # no CommandLine value available
26    condition: selection and not filter
27fields:
28    - CommandLine
29    - ParentCommandLine
30falsepositives:
31    - Rpcnet.exe / rpcnetp.exe which is a lojack style software. https://www.blackhat.com/docs/us-14/materials/us-14-Kamlyuk-Kamluk-Computrace-Backdoor-Revisited.pdf
32level: high