Suspicious Teams Application Related ObjectAcess Event

Description

Detects an access to authentication tokens and accounts of Microsoft Teams desktop application.

Query · sigma

selection:
  EventID: 4663
  ObjectName|contains:
  - \Microsoft\Teams\Cookies
  - \Microsoft\Teams\Local Storage\leveldb
filter:
  ProcessName|contains: \Microsoft\Teams\current\Teams.exe
condition: selection and not filter

Known false positives

  • Unknown
Raw source Suspicious Teams Application Related ObjectAcess Event · Sigma
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Published by SigmaHQ/sigma ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
title: Suspicious Teams Application Related ObjectAcess Event
id: 25cde13e-8e20-4c29-b949-4e795b76f16f
status: test
description: Detects an access to authentication tokens and accounts of Microsoft Teams desktop application.
references:
    - https://www.bleepingcomputer.com/news/security/microsoft-teams-stores-auth-tokens-as-cleartext-in-windows-linux-macs/
    - https://www.vectra.ai/blogpost/undermining-microsoft-teams-security-by-mining-tokens
author: '@SerkinValery'
date: 2022-09-16
tags:
    - attack.credential-access
    - attack.t1528
logsource:
    product: windows
    service: security
detection:
    selection:
        EventID: 4663
        ObjectName|contains:
            - '\Microsoft\Teams\Cookies'
            - '\Microsoft\Teams\Local Storage\leveldb'
    filter:
        ProcessName|contains: '\Microsoft\Teams\current\Teams.exe'
    condition: selection and not filter
falsepositives:
    - Unknown
level: high

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