Nasreddine Bencherchali
54 lines
1.7 KiB
YAML
54 lines
1.7 KiB
YAML
title: Suspicious Certutil Command Usage
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id: e011a729-98a6-4139-b5c4-bf6f6dd8239a
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status: deprecated
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description: Detects a suspicious Microsoft certutil execution with sub commands like 'decode' sub command, which is sometimes used to decode malicious code
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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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author: Florian Roth (Nextron Systems), juju4, keepwatch
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date: 2019/01/16
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modified: 2023/02/15
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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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logsource:
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category: process_creation
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product: windows
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detection:
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selection_img:
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- Image|endswith: '\certutil.exe'
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- OriginalFileName: 'CertUtil.exe'
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selection_cli:
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CommandLine|contains:
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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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- ' -exportPFX '
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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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- ' /exportPFX '
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condition: all of selection_*
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fields:
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- CommandLine
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- ParentCommandLine
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falsepositives:
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- False positives depend on scripts and administrative tools used in the monitored environment
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level: high
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