Microsoft Sync Center Suspicious Network Connections — Sigma Rule

Rule metadata and linked tags

Author: elhoim. Source status: test; severity: medium. Source dates: 2022-04-28 / 2024-03-12.

{
  "product": "windows",
  "category": "network_connection"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: bb72c43389667018c61f395c8209259e001bf0bb14c3a0caa03a01367f0a3c8b

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Microsoft Sync Center Suspicious Network Connections
id: 9f2cc74d-78af-4eb2-bb64-9cd1d292b87b
status: test
description: Detects suspicious connections from Microsoft Sync Center to non-private IPs.
references:
    - https://redcanary.com/blog/intelligence-insights-november-2021/
author: elhoim
date: 2022-04-28
modified: 2024-03-12
tags:
    - attack.privilege-escalation
    - attack.stealth
    - attack.t1055
    - attack.t1218
    - attack.execution
logsource:
    product: windows
    category: network_connection
detection:
    selection:
        Image|endswith: '\mobsync.exe'
    filter_main_local_ranges:
        DestinationIp|cidr:
            - '127.0.0.0/8'
            - '10.0.0.0/8'
            - '172.16.0.0/12'
            - '192.168.0.0/16'
            - '169.254.0.0/16'
            - '::1/128'  # IPv6 loopback
            - 'fe80::/10'  # IPv6 link-local addresses
            - 'fc00::/7'  # IPv6 private addresses
    condition: selection and not 1 of filter_main_*
falsepositives:
    - Unknown
level: medium

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://redcanary.com/blog/intelligence-insights-november-2021/