Hayabusa high test sigma
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
{
"network_connection": {
"EventID": 3,
"Channel": "Microsoft-Windows-Sysmon/Operational"
},
"selection": {
"Image
| contains": ":\\Windows\\Microsoft.NET\\",
"Image
| endswith": "\\dfsvc.exe",
"Initiated": "true"
},
"filter_main_known_ports": {
"DestinationPort": [
80,
443
]
},
"filter_optional_dns_ipv6": {
"DestinationIsIpv6": "true",
"DestinationPort": 53
},
"condition": "network_connection and (selection and not 1 of filter_main_* and not 1 of filter_optional_*)"
} False Positives
- ⚠ Unknown
Field Validations
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