Created Files by Microsoft Sync Center — Sigma Rule

Rule metadata and linked tags

Author: elhoim. Source status: test; severity: medium. Source dates: 2022-04-28 / 2022-06-02.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 7734664e0059719581ee099fb5d68b21d58478eb16da7197b17f2cdc3be42c90

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: Created Files by Microsoft Sync Center
id: 409f8a98-4496-4aaa-818a-c931c0a8b832
status: test
description: This rule detects suspicious files created by Microsoft Sync Center (mobsync)
references:
    - https://redcanary.com/blog/intelligence-insights-november-2021/
author: elhoim
date: 2022-04-28
modified: 2022-06-02
tags:
    - attack.privilege-escalation
    - attack.stealth
    - attack.t1055
    - attack.t1218
    - attack.execution
logsource:
    product: windows
    category: file_event
detection:
    selection_mobsync:
        Image|endswith: '\mobsync.exe'
    filter_created_file:
        TargetFilename|endswith:
            - '.dll'
            - '.exe'
    condition: selection_mobsync and filter_created_file
falsepositives:
    - Unknown
level: medium

Original YAML and metadata in JSON

False positives

• Unknown

Source references

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