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Windows Installer with Suspicious Properties

Identifies the execution of an installer from an archive or with suspicious properties. Adversaries may abuse msiexec.exe to launch local or network accessible MSI files in an attempt to bypass application whitelisting.

Rule type: eql
Rule indices:

  • logs-endpoint.events.*

Rule Severity: low
Risk Score: 21
Runs every: 60m
Searches indices from: now-119m
Maximum alerts per execution: ?
References:

Tags:

  • Domain: Endpoint
  • OS: Windows
  • Use Case: Threat Detection
  • Tactic: Defense Evasion
  • Rule Type: BBR
  • Data Source: Elastic Defend

Version: ?
Rule authors:

  • Elastic

Rule license: Elastic License v2

sequence with maxspan=1m
  [registry where host.os.type == "windows" and event.type == "change" and process.name : "msiexec.exe" and
   (
    (registry.value : "InstallSource" and
     registry.data.strings : ("?:\\Users\\*\\Temp\\Temp?_*.zip\\*",
                             "?:\\Users\\*\\*.7z\\*",
                             "?:\\Users\\*\\*.rar\\*")) or

    (registry.value : ("DisplayName", "ProductName") and registry.data.strings : "SetupTest")
    )]
  [process where host.os.type == "windows" and event.action == "start" and
    process.parent.name : "msiexec.exe" and
    not process.name : "msiexec.exe" and
    not (process.executable : ("?:\\Program Files (x86)\\*.exe", "?:\\Program Files\\*.exe") and process.code_signature.trusted == true)]

Framework: MITRE ATT&CK