Nasreddine Bencherchali
598d29f811
chore: change tags, date, modified fields to comply with v2 of the Sigma spec. chore: update the related type from `obsoletes` to `obsolete`. chore: update local json schema to the latest version.
39 lines
1.3 KiB
YAML
39 lines
1.3 KiB
YAML
title: Suspicious Execution of Powershell with Base64
|
|
id: fb843269-508c-4b76-8b8d-88679db22ce7
|
|
status: test
|
|
description: Commandline to launch powershell with a base64 payload
|
|
references:
|
|
- https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1059.001/T1059.001.md#atomic-test-20---powershell-invoke-known-malicious-cmdlets
|
|
- https://unit42.paloaltonetworks.com/unit42-pulling-back-the-curtains-on-encodedcommand-powershell-attacks/
|
|
- https://mikefrobbins.com/2017/06/15/simple-obfuscation-with-powershell-using-base64-encoding/
|
|
author: frack113
|
|
date: 2022-01-02
|
|
modified: 2023-01-05
|
|
tags:
|
|
- attack.execution
|
|
- attack.t1059.001
|
|
logsource:
|
|
category: process_creation
|
|
product: windows
|
|
detection:
|
|
selection:
|
|
Image|endswith:
|
|
- \powershell.exe
|
|
- \pwsh.exe
|
|
CommandLine|contains:
|
|
- ' -e '
|
|
- ' -en '
|
|
- ' -enc '
|
|
- ' -enco'
|
|
- ' -ec '
|
|
filter_encoding:
|
|
CommandLine|contains: ' -Encoding '
|
|
filter_azure:
|
|
ParentImage|contains:
|
|
- 'C:\Packages\Plugins\Microsoft.GuestConfiguration.ConfigurationforWindows\'
|
|
- '\gc_worker.exe'
|
|
condition: selection and not 1 of filter_*
|
|
falsepositives:
|
|
- Unknown
|
|
level: medium
|