Suspicious Teams Application Related ObjectAcess Event

Severity: high
Author: @SerkinValery
Source: upstream

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

MITRE ATT&CK coverage

Tactic	Techniques
Credential Access	`T1528` Steal Application Access Token

Event coverage

Provider	Event ID	Title
Security-Auditing	4663	An attempt was made to access an object.

Stages and Predicates

Stage 1: `selection`

or:
ObjectName|contains: '\Microsoft\Teams\Cookies'
ObjectName|contains: '\Microsoft\Teams\Local Storage\leveldb'

Stage 2: `not filter`

ProcessName|contains: '\Microsoft\Teams\current\Teams.exe'

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

Field	Kind	Values
`ObjectName`	match	`\Microsoft\Teams\Cookies` `\Microsoft\Teams\Local Storage\leveldb`
`ProcessName`	match	`\Microsoft\Teams\current\Teams.exe`