42 lines
1.2 KiB
YAML
42 lines
1.2 KiB
YAML
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title: DNSCat2 Powershell Implementation Detection Via Process Creation
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author: Cian Heasley
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date: 2020/08/08
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description: The PowerShell implementation of DNSCat2 calls nslookup to craft queries.
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Counting nslookup processes spawned by PowerShell will show hundreds or thousands
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of instances if PS DNSCat2 is active locally.
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detection:
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SELECTION_1:
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EventID: 1
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SELECTION_2:
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ParentImage: '*\powershell.exe'
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SELECTION_3:
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Image: '*\nslookup.exe'
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SELECTION_4:
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CommandLine: '*\nslookup.exe'
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condition: (SELECTION_1 and SELECTION_2 and SELECTION_3 and SELECTION_4) | count(Image)
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by ParentImage > 100
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falsepositives:
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- Other powershell scripts that call nslookup.exe
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fields:
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- Image
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- CommandLine
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- ParentImage
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id: b11d75d6-d7c1-11ea-87d0-0242ac130003
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level: high
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logsource:
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category: process_creation
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product: windows
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references:
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- https://github.com/lukebaggett/dnscat2-powershell
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- https://blu3-team.blogspot.com/2019/08/powershell-dns-c2-notes.html
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- https://ragged-lab.blogspot.com/2020/06/it-is-always-dns-powershell-edition.html
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status: experimental
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tags:
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- attack.command_and_control
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- attack.t1071
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- attack.t1071.004
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- attack.t1001.003
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- attack.t1041
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ruletype: SIGMA
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