Flash Player Update from Suspicious Location — Sigma Rule

Rule metadata and linked tags

Author: Florian Roth (Nextron Systems). Source status: test; severity: high. Source dates: 2017-10-25 / 2022-08-08.

{
  "category": "proxy"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 1614a83290c213089d9c4e16dd340cb4d1b99b60a407c09f2dc88caf8e258b67

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: Flash Player Update from Suspicious Location
id: 4922a5dd-6743-4fc2-8e81-144374280997
status: test
description: Detects a flashplayer update from an unofficial location
references:
    - https://gist.github.com/roycewilliams/a723aaf8a6ac3ba4f817847610935cfb
author: Florian Roth (Nextron Systems)
date: 2017-10-25
modified: 2022-08-08
tags:
    - attack.initial-access
    - attack.stealth
    - attack.t1189
    - attack.execution
    - attack.t1204.002
    - attack.t1036.005
logsource:
    category: proxy
detection:
    selection:
        - c-uri|contains: '/flash_install.php'
        - c-uri|endswith: '/install_flash_player.exe'
    filter:
        cs-host|endswith: '.adobe.com'
    condition: selection and not filter
falsepositives:
    - Unknown flash download locations
level: high

Original YAML and metadata in JSON

False positives

• Unknown flash download locations

Source references

• https://gist.github.com/roycewilliams/a723aaf8a6ac3ba4f817847610935cfb