Silenttrinity Stager Msbuild Activity — Sigma Rule

Rule metadata and linked tags

Author: Kiran kumar s, oscd.community. Source status: test; severity: high. Source dates: 2020-10-11 / 2022-10-05.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 55a6f39f043d74ab90330eaf97cf80e7a1ab22e7ecfce5fe7deaf57295d66f5d

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: Silenttrinity Stager Msbuild Activity
id: 50e54b8d-ad73-43f8-96a1-5191685b17a4
status: test
description: Detects a possible remote connections to Silenttrinity c2
references:
    - https://www.blackhillsinfosec.com/my-first-joyride-with-silenttrinity/
author: Kiran kumar s, oscd.community
date: 2020-10-11
modified: 2022-10-05
tags:
    - attack.execution
    - attack.stealth
    - attack.t1127.001
logsource:
    category: network_connection
    product: windows
detection:
    selection:
        Image|endswith: '\msbuild.exe'
    filter:
        DestinationPort:
            - 80
            - 443
        Initiated: 'true'
    condition: selection and filter
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://www.blackhillsinfosec.com/my-first-joyride-with-silenttrinity/