Dfsvc.EXE Initiated Network Connection Over Uncommon Port
Detects an initiated network connection over uncommon ports from "dfsvc.exe". A utility used to handled ClickOnce applications.
Detection logic
selection
Image|contains: :\Windows\Microsoft.NET\
Image|endswith: \dfsvc.exe
Initiated: "true"filter_main_known_ports
DestinationPort:
- 80
- 443filter_optional_dns_ipv6
DestinationIsIpv6: "true"
DestinationPort: 53Condition
selection and not 1 of filter_main_* and not 1 of filter_optional_*Raw YAML
title: Dfsvc.EXE Initiated Network Connection Over Uncommon Port
id: 4c5fba4a-9ef6-4f16-823d-606246054741
status: test
description: Detects an initiated network connection over uncommon ports from "dfsvc.exe". A utility used to handled ClickOnce applications.
references:
- https://posts.specterops.io/less-smartscreen-more-caffeine-ab-using-clickonce-for-trusted-code-execution-1446ea8051c5
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-06-12
modified: 2024-01-31
tags:
- attack.execution
- attack.t1203
- detection.threat-hunting
logsource:
category: network_connection
product: windows
detection:
selection:
Image|contains: ':\Windows\Microsoft.NET\'
Image|endswith: '\dfsvc.exe'
Initiated: 'true'
filter_main_known_ports:
DestinationPort:
- 80
- 443
filter_optional_dns_ipv6:
# Based on VT. More than 140 binaries made communication over DNS
DestinationIsIpv6: 'true'
DestinationPort: 53
condition: selection and not 1 of filter_main_* and not 1 of filter_optional_*
falsepositives:
- Unknown
level: highFalse positives
- Unknown