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Suspicious SolarWinds Child Process

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Suspicious SolarWinds Child Process

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A suspicious SolarWinds child process was detected, which may indicate an attempt to execute malicious programs.

Rule type: eql

Rule indices:

winlogbeat-*
logs-endpoint.events.*
logs-windows.*

Severity: medium

Risk score: 47

Runs every: 5 minutes

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

Elastic
Host
Windows
Threat Detection
Execution

Version: 101 (version history)

Added (Elastic Stack release): 7.11.0

Last modified (Elastic Stack release): 8.5.0

Rule authors: Elastic

Rule license: Elastic License v2

Potential false positives

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Trusted SolarWinds child processes, verify process details such as network connections and file writes.

Investigation guide

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Rule query

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process where event.type == "start" and process.parent.name:
("SolarWinds.BusinessLayerHost.exe",
"SolarWinds.BusinessLayerHostx64.exe") and not process.name : (
"APMServiceControl*.exe", "ExportToPDFCmd*.Exe",
"SolarWinds.Credentials.Orion.WebApi*.exe",
"SolarWinds.Orion.Topology.Calculator*.exe", "Database-
Maint.exe", "SolarWinds.Orion.ApiPoller.Service.exe",
"WerFault.exe", "WerMgr.exe",
"SolarWinds.BusinessLayerHost.exe",
"SolarWinds.BusinessLayerHostx64.exe") and not process.executable :
("?:\\Windows\\SysWOW64\\ARP.EXE",
"?:\\Windows\\SysWOW64\\lodctr.exe",
"?:\\Windows\\SysWOW64\\unlodctr.exe")

Threat mapping

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Framework: MITRE ATT&CK^TM

Tactic:
- Name: Execution
- ID: TA0002
- Reference URL: https://attack.mitre.org/tactics/TA0002/
Technique:
- Name: Native API
- ID: T1106
- Reference URL: https://attack.mitre.org/techniques/T1106/
Tactic:
- Name: Initial Access
- ID: TA0001
- Reference URL: https://attack.mitre.org/tactics/TA0001/
Technique:
- Name: Supply Chain Compromise
- ID: T1195
- Reference URL: https://attack.mitre.org/techniques/T1195/

Rule version history

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Version 101 (8.5.0 release)

Updated query, changed from:

process where event.type in ("start", "process_started") and
process.parent.name: ("SolarWinds.BusinessLayerHost.exe",
"SolarWinds.BusinessLayerHostx64.exe") and not process.name : (
"APMServiceControl*.exe", "ExportToPDFCmd*.Exe",
"SolarWinds.Credentials.Orion.WebApi*.exe",
"SolarWinds.Orion.Topology.Calculator*.exe", "Database-
Maint.exe", "SolarWinds.Orion.ApiPoller.Service.exe",
"WerFault.exe", "WerMgr.exe")

Version 7 (8.4.0 release)

Formatting only

Version 5 (8.3.0 release)

Formatting only

Version 4 (8.2.0 release)

Formatting only

Version 3 (7.12.0 release)

Formatting only

Version 2 (7.11.2 release)

Formatting only

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