Suspicious Managed Code Hosting Process

Elastic Stack Serverless Security

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.*
• logs-windows.*

Severity: high

Risk score: 73

Runs every: 5m

Searches indices from: now-9m (https://www.elastic.co/guide/en/elasticsearch/reference/current/common-options.html#date-math[Date Math format], see also Additional look-back time)

Maximum alerts per execution: 100

References:

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

Tags:

• Elastic
• Host
• Windows
• Threat Detection
• Defense Evasion

Version: 100

Rule authors:

• Elastic

Rule license: Elastic License v2

sequence by process.entity_id with maxspan=5m
 [process where event.type == "start" and
  process.name : ("wscript.exe", "cscript.exe", "mshta.exe", "wmic.exe", "regsvr32.exe", "svchost.exe", "dllhost.exe", "cmstp.exe")]
 [file where event.type != "deletion" and
  file.name : ("wscript.exe.log",
               "cscript.exe",
               "mshta.exe.log",
               "wmic.exe.log",
               "svchost.exe.log",
               "dllhost.exe.log",
               "cmstp.exe.log",
               "regsvr32.exe.log")]

Framework: MITRE ATT&CKTM

• 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/