Detection rules › Sigma
Invoke-Obfuscation COMPRESS OBFUSCATION
Detects Obfuscated Powershell via COMPRESS OBFUSCATION
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Execution | T1059.001 Command and Scripting Interpreter: PowerShell |
| Stealth | T1027 Obfuscated Files or Information |
Event coverage
| Provider | Event | Title |
|---|---|---|
| Sysmon | Event ID 1 | Process creation |
| Security-Auditing | Event ID 4688 | A new process has been created. |
Rule body yaml
title: Invoke-Obfuscation COMPRESS OBFUSCATION
id: 7eedcc9d-9fdb-4d94-9c54-474e8affc0c7
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: 2022-12-29
tags:
- attack.stealth
- attack.t1027
- attack.execution
- attack.t1059.001
logsource:
category: process_creation
product: windows
detection:
selection:
CommandLine|contains|all:
- 'new-object'
- 'text.encoding]::ascii'
CommandLine|contains:
- 'system.io.compression.deflatestream'
- 'system.io.streamreader'
- 'readtoend('
condition: selection
falsepositives:
- Unknown
level: medium
Stages and Predicates
Stage 0: condition
selectionStage 1: selection
selection:
CommandLine|contains|all:
- 'new-object'
- 'text.encoding]::ascii'
CommandLine|contains:
- 'system.io.compression.deflatestream'
- 'system.io.streamreader'
- 'readtoend('
Indicators
Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.
| Field | Kind | Values |
|---|---|---|
CommandLine | match |
|