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35 lines
1.2 KiB
YAML
35 lines
1.2 KiB
YAML
title: Suspicious Certutil Command
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status: experimental
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description: Detetcs a suspicious Microsoft certutil execution with sub commands like 'decode' sub command, which is sometimes used to decode malicious code with the built-in certutil utility
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author:
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- Florian Roth
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- juju4
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reference:
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- https://twitter.com/JohnLaTwC/status/835149808817991680
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- https://twitter.com/subTee/status/888102593838362624
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- https://twitter.com/subTee/status/888071631528235010
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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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logsource:
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product: windows
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service: sysmon
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detection:
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selection:
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EventID: 1
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CommandLine:
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- '*\certutil.exe * -decode *'
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- '*\certutil.exe * -decodehex *'
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- '*\certutil.exe *-urlcache* http*'
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- '*\certutil.exe *-urlcache* ftp*'
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- '*\certutil.exe *-URL*'
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- '*\certutil.exe *-ping*'
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condition: 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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