collection_posh_compression.toml

[metadata]
creation_date = "2023/07/06"
integration = ["windows"]
maturity = "production"
min_stack_comments = "New fields added: required_fields, related_integrations, setup"
min_stack_version = "8.3.0"
updated_date = "2023/10/13"


[rule]
author = ["Elastic"]
description = """
Identifies the use of Cmdlets and methods related to archive compression activities. Adversaries will often compress and
encrypt data in preparation for exfiltration.
"""
from = "now-119m"
interval = "60m"
index = ["winlogbeat-*", "logs-windows.*"]
language = "kuery"
license = "Elastic License v2"
name = "PowerShell Script with Archive Compression Capabilities"
risk_score = 21
rule_id = "27071ea3-e806-4697-8abc-e22c92aa4293"
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
```
"""
severity = "low"
tags = ["Domain: Endpoint", "OS: Windows", "Use Case: Threat Detection", "Tactic: Collection", "Data Source: PowerShell Logs", "Rule Type: BBR"]
timestamp_override = "event.ingested"
type = "query"
building_block_type = "default"

query = '''
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"
) and 
  not file.path : (
        ?\:\\\\ProgramData\\\\Microsoft\\\\Windows?Defender?Advanced?Threat?Protection\\\\Downloads\\\\* or
        ?\:\\\\ProgramData\\\\Microsoft\\\\Windows?Defender?Advanced?Threat?Protection\\\\DataCollection\\\\* or
        ?\:\\\\Program?Files\\\\Microsoft?Dependency?Agent\\\\plugins\\\\* or
        ?\:\\\\Program?Files\\\\Azure\\\\StorageSyncAgent\\\\AFSDiag.ps1
      )
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1560"
name = "Archive Collected Data"
reference = "https://attack.mitre.org/techniques/T1560/"

[rule.threat.tactic]
id = "TA0009"
name = "Collection"
reference = "https://attack.mitre.org/tactics/TA0009/"

[[rule.threat]]
framework = "MITRE ATT&CK"

[[rule.threat.technique]]
id = "T1059"
name = "Command and Scripting Interpreter"
reference = "https://attack.mitre.org/techniques/T1059/"

[[rule.threat.technique.subtechnique]]
id = "T1059.001"
name = "PowerShell"
reference = "https://attack.mitre.org/techniques/T1059/001/"


[rule.threat.tactic]
id = "TA0002"
name = "Execution"
reference = "https://attack.mitre.org/tactics/TA0002/"