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Compression DLL Loaded by Unusual Process

Identifies the image load of a compression DLL. Adversaries will often compress and encrypt data in preparation for exfiltration.

Rule type: eql
Rule indices:

  • logs-endpoint.events.library-*

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: Collection
  • Data Source: Elastic Defend
  • Rule Type: BBR

Version: ?
Rule authors:

  • Elastic

Rule license: Elastic License v2

library where host.os.type == "windows" and event.action == "load" and
  dll.name : ("System.IO.Compression.FileSystem.ni.dll", "System.IO.Compression.ni.dll") and
  not
  (
    (
      process.executable : (
        "?:\\Program Files\\*",
        "?:\\Program Files (x86)\\*",
        "?:\\Windows\\Microsoft.NET\\Framework*\\mscorsvw.exe",
        "?:\\Windows\\System32\\sdiagnhost.exe",
        "?:\\Windows\\System32\\inetsrv\\w3wp.exe",
        "?:\\Windows\\SysWOW64\\inetsrv\\w3wp.exe",
        "?:\\ProgramData\\Microsoft\\Windows Defender Advanced Threat Protection\\DataCollection\\*\\OpenHandleCollector.exe"
      ) and process.code_signature.trusted == true
    ) or
    (
      process.name : "NuGet.exe" and process.code_signature.trusted == true and user.id : ("S-1-5-18", "S-1-5-20")
    )
  )

Framework: MITRE ATT&CK