Windows svchost.exe Spawned by Uncommon Parent Process

ATT&CK techniques

Defense Evasion

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
- T1036.005Match Legitimate Resource Name or Location
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule flags process creation events where the child process is svchost.exe and the parent process is not among a set of common Windows service-related binaries. Attackers may use svchost as a living-off-the-land style proxy to blend in with normal Windows activity, so deviations in the parent lineage can be a useful stealth indicator. It relies on process creation telemetry that includes Image and ParentImage values, specifically matching svchost.exe by filename and excluding known benign parents.

Reporting behind it

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Windows svchost.exe Spawned by Uncommon Parent Process

Pivot detection · T1036.005 · 9 related

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

windows-svchost-exe-spawned-by-uncommon-parent-process-01d2e2a1

title: Windows svchost.exe Spawned by Uncommon Parent Process
id: 8af42975-a5ce-486c-b5fe-ca1001804f6d
status: test
description: This rule flags process creation events where the child process is svchost.exe and the parent process is not among a set of common Windows service-related binaries. Attackers may use svchost as a living-off-the-land style proxy to blend in with normal Windows activity, so deviations in the parent lineage can be a useful stealth indicator. It relies on process creation telemetry that includes Image and ParentImage values, specifically matching svchost.exe by filename and excluding known benign parents.
references:
  - Internal Research
  - https://github.com/SigmaHQ/sigma/blob/master/rules/windows/process_creation/proc_creation_win_svchost_uncommon_parent_process.yml
author: Florian Roth (Nextron Systems), Huntrule Team
date: 2017-08-15
modified: 2022-06-28
tags:
  - attack.stealth
  - attack.t1036.005
logsource:
  category: process_creation
  product: windows
detection:
  selection:
    Image|endswith: \svchost.exe
  filter_main_generic:
    ParentImage|endswith:
      - \Mrt.exe
      - \MsMpEng.exe
      - \ngen.exe
      - \rpcnet.exe
      - \services.exe
      - \TiWorker.exe
  filter_main_parent_null:
    ParentImage: null
  filter_main_parent_empty:
    ParentImage:
      - "-"
      - ""
  condition: selection and not 1 of filter_main_*
falsepositives:
  - Unknown
level: medium
license: DRL-1.1
related:
  - id: 01d2e2a1-5f09-44f7-9fc1-24faa7479b6d
    type: derived

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