Certreq Downloading Malicious Binaries

 1title: Certreq Downloading Malicious Binaries
 2id: da4eca65-03c5-497a-a8f0-d4b0534a5c53
 3status: experimental
 4description: |
 5    Just like certutil, certreq can also be abused by adversaries to download and 
 6    upload data. The following analytic will look for the execution of certreq.exe 
 7    with command options that suggest a file is being downloaded. Part of the 
 8    RedCanary 2024 Threat Detection Report.    
 9references:
10    - https://redcanary.com/threat-detection-report/techniques/ingress-tool-transfer/
11author: RedCanary, Sigma formatting by Micah Babinski
12date: 2024/03/21
13tags:
14    - attack.command_and_control
15    - attack.t1105
16logsource:
17    category: process_creation
18    product: windows
19detection:
20    selection:
21        Image|endswith: '\certreq.exe'
22        CommandLine|contains:
23            - '-post'
24            - '-config'
25            - 'http'
26            - 'get'
27    condition: selection
28falsepositives:
29    - Unknown
30level: low```