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.
36 lines
1.3 KiB
YAML
36 lines
1.3 KiB
YAML
title: Suspicious Download Via Certutil.EXE
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id: 19b08b1c-861d-4e75-a1ef-ea0c1baf202b
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related:
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- id: 13e6fe51-d478-4c7e-b0f2-6da9b400a829
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type: similar
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status: test
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description: Detects the execution of certutil with certain flags that allow the utility to download files.
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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://forensicitguy.github.io/agenttesla-vba-certutil-download/
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- https://news.sophos.com/en-us/2021/04/13/compromised-exchange-server-hosting-cryptojacker-targeting-other-exchange-servers/
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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), Jonhnathan Ribeiro, oscd.community, Nasreddine Bencherchali (Nextron Systems)
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date: 2023-02-15
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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_flags:
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CommandLine|contains:
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- 'urlcache '
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- 'verifyctl '
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selection_http:
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CommandLine|contains: 'http'
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condition: all of selection_*
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falsepositives:
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- Unknown
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level: medium
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