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Indexed Rules
3,707
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Backends
17
Live from sigconverter.io
CLI Versions
10
Newest: 2.0.2
Translation Workspace
Shape the rule before it leaves Phoenix
Tune Translation
Active Rule
Suspicious CertReq Command to Download
Target Profile
Splunk
Splunk SPL & tstats data model queries
Format Mode
Default
Plain SPL queries
Conversion Output
Suspicious CertReq Command to Download
Using Splunk · Default · sigma-cli 2.0.2
Translation controls
Adjust the rule on the left, then regenerate when you want a fresh backend-native query.
BackendSplunkFormatDefaultVersion2.0.2
title: Suspicious CertReq Command to Download
id: 4480827a-9799-4232-b2c4-ccc6c4e9e12b
status: experimental
description: |
Detects a suspicious CertReq execution downloading a file.
This behavior is often used by attackers to download additional payloads or configuration files.
Certreq is a built-in Windows utility used to request and retrieve certificates from a certification authority (CA). However, it can be abused by threat actors for malicious purposes.
references:
- https://lolbas-project.github.io/lolbas/Binaries/Certreq/
author: Christian Burkard (Nextron Systems)
date: 2021-11-24
modified: 2025-10-29
tags:
- attack.command-and-control
- attack.t1105
logsource:
category: process_creation
product: windows
detection:
selection_img:
- Image|endswith: '\certreq.exe'
- OriginalFileName: 'CertReq.exe'
selection_cli_flag_post:
CommandLine|contains|windash: '-Post'
selection_cli_flag_config:
CommandLine|contains|windash: '-config'
selection_cli_http:
CommandLine|contains: 'http'
condition: all of selection_*
falsepositives:
- Unlikely
level: high
CLI command
Copy the exact command to reproduce this translation locally.
sigma convert --without-pipeline -t splunk -f default rules/windows/process_creation/proc_creation_win_certreq_download.yml