Microsoft Teams Sensitive File Access By Uncommon Applications
Detects file access attempts to sensitive Microsoft teams files (leveldb, cookies) by an uncommon process.
Detection logic
selection
FileName|contains:
- \Microsoft\Teams\Cookies
- \Microsoft\Teams\Local Storage\leveldbfilter_main_legit_location
Image|endswith: \Microsoft\Teams\current\Teams.exeCondition
selection and not 1 of filter_main_*Raw YAML
title: Microsoft Teams Sensitive File Access By Uncommon Applications
id: 65744385-8541-44a6-8630-ffc824d7d4cc
status: test
description: |
Detects file access attempts to sensitive Microsoft teams files (leveldb, cookies) by an uncommon process.
references:
- https://www.bleepingcomputer.com/news/security/microsoft-teams-stores-auth-tokens-as-cleartext-in-windows-linux-macs/
- https://www.vectra.ai/blog/undermining-microsoft-teams-security-by-mining-tokens
author: '@SerkinValery'
date: 2024-07-22
tags:
- attack.credential-access
- attack.t1528
logsource:
product: windows
category: file_access
definition: 'Requirements: Microsoft-Windows-Kernel-File ETW provider'
detection:
selection:
FileName|contains:
- '\Microsoft\Teams\Cookies'
- '\Microsoft\Teams\Local Storage\leveldb'
filter_main_legit_location:
# Note: its best to filter the full path to avoid false negatives
Image|endswith: '\Microsoft\Teams\current\Teams.exe'
condition: selection and not 1 of filter_main_*
falsepositives:
- Unknown
level: mediumFalse positives
- Unknown