sigmahighHunting

Suspicious File Encoded To Base64 Via Certutil.EXE

Detects the execution of certutil with the "encode" flag to encode a file to base64 where the extensions of the file is suspicious

MITRE ATT&CK

T1027

defense-evasion

Detection Query

selection_img:
  - Image|endswith: \certutil.exe
  - OriginalFileName: CertUtil.exe
selection_cli:
  CommandLine|contains|windash: -encode
selection_extension:
  CommandLine|contains:
    - .acl
    - .bat
    - .doc
    - .gif
    - .jpeg
    - .jpg
    - .mp3
    - .pdf
    - .png
    - .ppt
    - .tmp
    - .xls
    - .xml
condition: all of selection_*

Author

Nasreddine Bencherchali (Nextron Systems)

Created

2023-05-15

Data Sources

windowsProcess Creation Events

Platforms

windows

References

Tags

attack.defense-evasionattack.t1027

Raw Content

title: Suspicious File Encoded To Base64 Via Certutil.EXE
id: ea0cdc3e-2239-4f26-a947-4e8f8224e464
related:
    - id: e62a9f0c-ca1e-46b2-85d5-a6da77f86d1a
      type: derived
status: test
description: Detects the execution of certutil with the "encode" flag to encode a file to base64 where the extensions of the file is suspicious
references:
    - https://www.virustotal.com/gui/file/35c22725a92d5cb1016b09421c0a6cdbfd860fd4778b3313669b057d4a131cb7/behavior
    - https://www.virustotal.com/gui/file/427616528b7dbc4a6057ac89eb174a3a90f7abcf3f34e5a359b7a910d82f7a72/behavior
    - https://www.virustotal.com/gui/file/34de4c8beded481a4084a1fd77855c3e977e8ac643e5c5842d0f15f7f9b9086f/behavior
    - https://www.virustotal.com/gui/file/4abe1395a09fda06d897a9c4eb247278c1b6cddda5d126ce5b3f4f499e3b8fa2/behavior
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-05-15
modified: 2024-03-05
tags:
    - attack.defense-evasion
    - attack.t1027
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith: '\certutil.exe'
        - OriginalFileName: 'CertUtil.exe'
    selection_cli:
        CommandLine|contains|windash: '-encode'
    selection_extension:
        CommandLine|contains:
            - '.acl'
            - '.bat'
            - '.doc'
            - '.gif'
            - '.jpeg'
            - '.jpg'
            - '.mp3'
            - '.pdf'
            - '.png'
            - '.ppt'
            - '.tmp'
            - '.xls'
            - '.xml'
    condition: all of selection_*
falsepositives:
    - Unknown
level: high
regression_tests_path: regression_data/rules/windows/process_creation/proc_creation_win_certutil_encode_susp_extensions/info.yml