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Uncommon Network Connection Initiated By Certutil.EXE

Detects a network connection initiated by the certutil.exe utility. Attackers can abuse the utility in order to download malware or additional payloads.

MITRE ATT&CK

T1105

command-and-control

Detection Query

selection:
  Image|endswith: \certutil.exe
  Initiated: "true"
  DestinationPort:
    - 80
    - 135
    - 443
    - 445
condition: selection

Author

frack113, Florian Roth (Nextron Systems)

Created

2022-09-02

Data Sources

windowsNetwork Connection Events

Platforms

windows

References

https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/certutil

Tags

attack.command-and-controlattack.t1105

Raw Content

title: Uncommon Network Connection Initiated By Certutil.EXE
id: 0dba975d-a193-4ed1-a067-424df57570d1
status: test
description: |
    Detects a network connection initiated by the certutil.exe utility.
    Attackers can abuse the utility in order to download malware or additional payloads.
references:
    - https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/certutil
author: frack113, Florian Roth (Nextron Systems)
date: 2022-09-02
modified: 2024-05-31
tags:
    - attack.command-and-control
    - attack.t1105
logsource:
    category: network_connection
    product: windows
detection:
    selection:
        Image|endswith: '\certutil.exe'
        Initiated: 'true'
        DestinationPort:
            - 80
            - 135
            - 443
            - 445
    condition: selection
falsepositives:
    - Unknown
level: high