62 lines
1.6 KiB
YAML
62 lines
1.6 KiB
YAML
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title: Suspicious Certutil Command
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author: Florian Roth, juju4, keepwatch
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date: 2019/01/16
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description: Detects a suspicious Microsoft certutil execution with sub commands like
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'decode' sub command, which is sometimes used to decode malicious code with the
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built-in certutil utility
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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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CommandLine:
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- '* -decode *'
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- '* -decodehex *'
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- '* -urlcache *'
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- '* -verifyctl *'
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- '* -encode *'
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- '* /decode *'
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- '* /decodehex *'
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- '* /urlcache *'
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- '* /verifyctl *'
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- '* /encode *'
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SELECTION_3:
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Image: '*\certutil.exe'
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SELECTION_4:
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CommandLine:
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- '*URL*'
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- '*ping*'
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condition: (SELECTION_1 and (SELECTION_2 or (SELECTION_3 and SELECTION_4)))
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falsepositives:
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- False positives depend on scripts and administrative tools used in the monitored
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environment
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fields:
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- CommandLine
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- ParentCommandLine
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id: e011a729-98a6-4139-b5c4-bf6f6dd8239a
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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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modified: 2021/04/23
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references:
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- https://twitter.com/JohnLaTwC/status/835149808817991680
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- https://blogs.technet.microsoft.com/pki/2006/11/30/basic-crl-checking-with-certutil/
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- https://www.trustedsec.com/2017/07/new-tool-release-nps_payload/
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- https://twitter.com/egre55/status/1087685529016193025
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- https://lolbas-project.github.io/lolbas/Binaries/Certutil/
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status: experimental
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tags:
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- attack.defense_evasion
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- attack.t1140
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- attack.command_and_control
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- attack.t1105
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- attack.s0160
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- attack.g0007
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- attack.g0010
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- attack.g0045
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- attack.g0049
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- attack.g0075
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- attack.g0096
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ruletype: SIGMA
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