86 lines
2.5 KiB
YAML
86 lines
2.5 KiB
YAML
title: PowerShell Network Connections
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author: Florian Roth
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date: 2017/03/13
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description: Detects a Powershell process that opens network connections - check for
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suspicious target ports and target systems - adjust to your environment (e.g.
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extend filters with company's ip range')
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detection:
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SELECTION_1:
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EventID: 3
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SELECTION_10:
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DestinationIp: 172.19.*
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SELECTION_11:
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DestinationIp: 172.20.*
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SELECTION_12:
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DestinationIp: 172.21.*
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SELECTION_13:
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DestinationIp: 172.22.*
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SELECTION_14:
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DestinationIp: 172.23.*
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SELECTION_15:
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DestinationIp: 172.24.*
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SELECTION_16:
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DestinationIp: 172.25.*
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SELECTION_17:
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DestinationIp: 172.26.*
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SELECTION_18:
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DestinationIp: 172.27.*
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SELECTION_19:
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DestinationIp: 172.28.*
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SELECTION_2:
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Image: '*\powershell.exe'
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SELECTION_20:
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DestinationIp: 172.29.*
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SELECTION_21:
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DestinationIp: 172.30.*
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SELECTION_22:
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DestinationIp: 172.31.*
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SELECTION_23:
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DestinationIp: 127.0.0.1*
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SELECTION_24:
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DestinationIsIpv6: 'false'
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SELECTION_25:
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User: NT AUTHORITY\SYSTEM
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SELECTION_26:
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User: '*AUT*'
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SELECTION_27:
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User: '* NT*'
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SELECTION_3:
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Initiated: 'true'
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SELECTION_4:
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DestinationIsIpv6: 'false'
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SELECTION_5:
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DestinationIp: 10.*
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SELECTION_6:
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DestinationIp: 192.168.*
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SELECTION_7:
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DestinationIp: 172.16.*
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SELECTION_8:
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DestinationIp: 172.17.*
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SELECTION_9:
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DestinationIp: 172.18.*
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condition: (SELECTION_1 and (SELECTION_2 and SELECTION_3 and SELECTION_4) and not
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((SELECTION_5 or SELECTION_6 or SELECTION_7 or SELECTION_8 or SELECTION_9
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or SELECTION_10 or SELECTION_11 or SELECTION_12 or SELECTION_13 or SELECTION_14
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or SELECTION_15 or SELECTION_16 or SELECTION_17 or SELECTION_18 or SELECTION_19
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or SELECTION_20 or SELECTION_21 or SELECTION_22 or SELECTION_23) and SELECTION_24
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and SELECTION_25 and SELECTION_26 and SELECTION_27))
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falsepositives:
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- Administrative scripts
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id: 1f21ec3f-810d-4b0e-8045-322202e22b4b
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level: low
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logsource:
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category: network_connection
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product: windows
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modified: 2021/06/14
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references:
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- https://www.youtube.com/watch?v=DLtJTxMWZ2o
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status: experimental
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tags:
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- attack.execution
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- attack.t1059.001
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- attack.t1086
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yml_filename: sysmon_powershell_network_connection.yml
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yml_path: /Users/user/Documents/YamatoSecurity/sigma/rules/windows/network_connection
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