Ryan Plas
1d40f1d20b
chore: update Microsoft references link to use the "learn" subdomain instead of "docs". --------- Co-authored-by: nasbench <8741929+nasbench@users.noreply.github.com> Thanks: @ryanplasma
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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