Suspicious Managed Code Hosting Process

Identifies a suspicious managed code hosting process which could indicate code injection or other form of suspicious code execution.

Rule type: eql

Rule indices:

winlogbeat-*
logs-endpoint.events.file-*
logs-windows.sysmon_operational-*
logs-m365_defender.event-*
logs-sentinel_one_cloud_funnel.*
endgame-*
logs-crowdstrike.fdr*

Severity: high

Risk score: 73

Runs every: 5m

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

Maximum alerts per execution: 100

References:

http://web.archive.org/web/20230329154538/https://blog.menasec.net/2019/07/interesting-difr-traces-of-net-clr.html

Tags:

Domain: Endpoint
OS: Windows
Use Case: Threat Detection
Tactic: Defense Evasion
Data Source: Elastic Defend
Data Source: Sysmon
Data Source: Microsoft Defender for Endpoint
Data Source: SentinelOne
Data Source: Elastic Endgame
Data Source: Crowdstrike

Version: 309

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

edit

file where host.os.type == "windows" and event.type != "deletion" and
  file.name : ("wscript.exe.log",
               "cscript.exe.log",
               "mshta.exe.log",
               "wmic.exe.log",
               "svchost.exe.log",
               "dllhost.exe.log",
               "cmstp.exe.log",
               "regsvr32.exe.log")

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
Technique:
- Name: Process Injection
- ID: T1055
- Reference URL: https://attack.mitre.org/techniques/T1055/

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