Detection rules › Sigma
File Download via CertOC.EXE
Detects when a user downloads a file by using CertOC.exe
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Command & Control |
Telemetry coverage
| Provider | Record / event type |
|---|---|
| Sysmon | Event ID 1: Process creation |
Rule body
title: File Download via CertOC.EXE
id: 70ad0861-d1fe-491c-a45f-fa48148a300d
related:
- id: b86f6dea-0b2f-41f5-bdcc-a057bd19cd6a
type: similar
status: test
description: Detects when a user downloads a file by using CertOC.exe
references:
- https://lolbas-project.github.io/lolbas/Binaries/Certoc/
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-05-16
modified: 2023-10-18
tags:
- attack.command-and-control
- attack.t1105
logsource:
category: process_creation
product: windows
detection:
selection_img:
- Image|endswith: '\certoc.exe'
- OriginalFileName: 'CertOC.exe'
selection_cli:
CommandLine|contains|all:
- '-GetCACAPS'
- 'http'
condition: all of selection*
falsepositives:
- Unknown
level: medium
Stages and Predicates
Stage 0: condition
all of selection*Stage 1: selection_img
selection_img:
- Image|endswith: '\certoc.exe'
- OriginalFileName: 'CertOC.exe'
Stage 2: selection_cli
selection_cli:
CommandLine|contains|all:
- '-GetCACAPS'
- 'http'
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
CommandLine | match |
| field:"CommandLine" kind:match |
Image | ends_with |
| field:"Image" kind:ends_with value:"\certoc.exe" |
OriginalFileName | eq |
| field:"OriginalFileName" kind:eq value:"CertOC.exe" |