Invoke-Obfuscation COMPRESS OBFUSCATION - PowerShell

testmedium
Log-Quelle: windows · ps_scriptAutor Timur Zinniatullin, oscd.communityDatum 2020-10-18
01

Beschreibung

Was dies ist, in Kürze.

Detects Obfuscated Powershell via COMPRESS OBFUSCATION

02

Tags

attack.stealthattack.t1027attack.executionattack.t1059.001
03

Regelquelle (YAML)

title: Invoke-Obfuscation COMPRESS OBFUSCATION - PowerShell
id: 20e5497e-331c-4cd5-8d36-935f6e2a9a07
status: test
description: Detects Obfuscated Powershell via COMPRESS OBFUSCATION
references:
    - https://github.com/SigmaHQ/sigma/issues/1009 # (Task 19)
author: Timur Zinniatullin, oscd.community
date: 2020-10-18
modified: 2022-11-29
tags:
    - attack.stealth
    - attack.t1027
    - attack.execution
    - attack.t1059.001
logsource:
    product: windows
    category: ps_script
    definition: 'Requirements: Script Block Logging must be enabled'
detection:
    selection_4104:
        ScriptBlockText|contains|all:
            - 'new-object'
            - 'text.encoding]::ascii'
        ScriptBlockText|contains:
            - 'system.io.compression.deflatestream'
            - 'system.io.streamreader'
        ScriptBlockText|endswith: 'readtoend'
    condition: selection_4104
falsepositives:
    - Unknown
level: medium
04

erkennt Techniken (2)

ATT&CK-Techniken, die dies ermöglicht oder abbildet.

05

Referenzen

Externe Belege — Patches, Meldungen, Analysen.