Nasreddine Bencherchali
598d29f811
chore: change tags, date, modified fields to comply with v2 of the Sigma spec. chore: update the related type from `obsoletes` to `obsolete`. chore: update local json schema to the latest version.
28 lines
1.2 KiB
YAML
28 lines
1.2 KiB
YAML
title: File Encoded To Base64 Via Certutil.EXE
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id: e62a9f0c-ca1e-46b2-85d5-a6da77f86d1a
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status: test
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description: Detects the execution of certutil with the "encode" flag to encode a file to base64. This can be abused by threat actors and attackers for data exfiltration
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references:
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- https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/certutil
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- https://unit42.paloaltonetworks.com/new-babyshark-malware-targets-u-s-national-security-think-tanks/
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- https://lolbas-project.github.io/lolbas/Binaries/Certutil/
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author: Florian Roth (Nextron Systems), Jonhnathan Ribeiro, oscd.community, Nasreddine Bencherchali (Nextron Systems)
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date: 2019-02-24
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modified: 2024-03-05
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tags:
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- attack.defense-evasion
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- attack.t1027
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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|windash: '-encode'
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condition: all of selection_*
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falsepositives:
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- As this is a general purpose rule, legitimate usage of the encode functionality will trigger some false positives. Apply additional filters accordingly
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level: medium
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