github-actions[bot]
a6e7cce606
chore: promote older rules status from `experimental` to `test` --------- Co-authored-by: nasbench <8741929+nasbench@users.noreply.github.com>
39 lines
1.3 KiB
YAML
39 lines
1.3 KiB
YAML
title: Suspicious Execution of Powershell with Base64
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id: fb843269-508c-4b76-8b8d-88679db22ce7
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status: test
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description: Commandline to launch powershell with a base64 payload
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references:
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- https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1059.001/T1059.001.md#atomic-test-20---powershell-invoke-known-malicious-cmdlets
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- https://unit42.paloaltonetworks.com/unit42-pulling-back-the-curtains-on-encodedcommand-powershell-attacks/
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- https://mikefrobbins.com/2017/06/15/simple-obfuscation-with-powershell-using-base64-encoding/
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author: frack113
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date: 2022/01/02
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modified: 2023/01/05
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tags:
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- attack.execution
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- attack.t1059.001
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logsource:
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category: process_creation
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product: windows
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detection:
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selection:
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Image|endswith:
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- \powershell.exe
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- \pwsh.exe
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CommandLine|contains:
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- ' -e '
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- ' -en '
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- ' -enc '
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- ' -enco'
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- ' -ec '
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filter_encoding:
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CommandLine|contains: ' -Encoding '
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filter_azure:
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ParentImage|contains:
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- 'C:\Packages\Plugins\Microsoft.GuestConfiguration.ConfigurationforWindows\'
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- '\gc_worker.exe'
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condition: selection and not 1 of filter_*
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falsepositives:
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- Unknown
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level: medium
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