PowerShell Script with Archive Compression Capabilities | Elastic Security Solution [8.13]

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PowerShell Script with Archive Compression Capabilitiesedit

Identifies the use of Cmdlets and methods related to archive compression activities. Adversaries will often compress and encrypt data in preparation for exfiltration.

Rule type: query

Rule indices:

winlogbeat-*
logs-windows.powershell*

Severity: low

Risk score: 21

Runs every: 60m

Searches indices from: now-119m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References: None

Tags:

Domain: Endpoint
OS: Windows
Use Case: Threat Detection
Tactic: Collection
Data Source: PowerShell Logs
Rule Type: BBR

Version: 105

Rule authors:

Elastic

Rule license: Elastic License v2

Setupedit

Setup

The PowerShell Script Block Logging logging policy must be enabled. Steps to implement the logging policy with Advanced Audit Configuration:

Computer Configuration >
Administrative Templates >
Windows PowerShell >
Turn on PowerShell Script Block Logging (Enable)

Steps to implement the logging policy via registry:

reg add "hklm\SOFTWARE\Policies\Microsoft\Windows\PowerShell\ScriptBlockLogging" /v EnableScriptBlockLogging /t REG_DWORD /d 1

Rule queryedit

event.category:process and host.os.type:windows and
(
  powershell.file.script_block_text : (
    "IO.Compression.ZipFile" or
    "IO.Compression.ZipArchive" or
    "ZipFile.CreateFromDirectory" or
    "IO.Compression.BrotliStream" or
    "IO.Compression.DeflateStream" or
    "IO.Compression.GZipStream" or
    "IO.Compression.ZLibStream"
  ) and
  powershell.file.script_block_text : (
    "CompressionLevel" or
    "CompressionMode" or
    "ZipArchiveMode"
  ) or
  powershell.file.script_block_text : "Compress-Archive"
)

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Collection
- ID: TA0009
- Reference URL: https://attack.mitre.org/tactics/TA0009/
Technique:
- Name: Archive Collected Data
- ID: T1560
- Reference URL: https://attack.mitre.org/techniques/T1560/
Tactic:
- Name: Execution
- ID: TA0002
- Reference URL: https://attack.mitre.org/tactics/TA0002/
Technique:
- Name: Command and Scripting Interpreter
- ID: T1059
- Reference URL: https://attack.mitre.org/techniques/T1059/
Sub-technique:
- Name: PowerShell
- ID: T1059.001
- Reference URL: https://attack.mitre.org/techniques/T1059/001/

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