Sigma rule: File Download via CertOC.EXE

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-884a4db52bd3, updated 2023-10-18T00:00:00.000Z.

Rule

Title
File Download via CertOC.EXE
Status
test
Level
medium
Author
Nasreddine Bencherchali (Nextron Systems)
Date
2022-05-16
Modified
2023-10-18
File
rules/windows/process_creation/proc_creation_win_certoc_download.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects when a user downloads a file by using CertOC.exe

Log source

product
windows
category
process_creation

Detection

selection_img:
    - Image|endswith: '\certoc.exe'
    - OriginalFileName: 'CertOC.exe'
selection_cli:
    CommandLine|contains|all:
        - '-GetCACAPS'
        - 'http'
condition: all of selection*

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.command-and-control
  • attack.t1105

MITRE ATT&CK ids this rule names

Related rules

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_creation/proc_creation_win_certoc_download.yml

Sources and licences

  • SigmaHQ

    "File Download via CertOC.EXE" by Nasreddine Bencherchali (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_creation/proc_creation_win_certoc_download.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: File Download via CertOC.EXE",
entity page, dataset version ref-884a4db52bd3, updated 2023-10-18T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/70ad0861-d1fe-491c-a45f-fa48148a300d (accessed 2026-11-03).
Underlying source: SigmaHQ rule 70ad0861-d1fe-491c-a45f-fa48148a300d, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.