Potentially Suspicious Command Targeting Teams Sensitive Files

Severity: medium
Author: @SerkinValery
Source: upstream

Detects a commandline containing references to the Microsoft Teams database or cookies files from a process other than Teams. The database might contain authentication tokens and other sensitive information about the logged in accounts.

MITRE ATT&CK coverage

Tactic	Techniques
Credential Access	`T1528` Steal Application Access Token

Event coverage

Provider	Event ID	Title
Sysmon	1	Process creation
Security-Auditing	4688	A new process has been created.

Stages and Predicates

Stage 1: `selection`

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

Stage 2: `not 1 of filter_main_legit_locations`

Image|endswith: '\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
`CommandLine`	match	`\Microsoft\Teams\Cookies` `\Microsoft\Teams\Local Storage\leveldb`
`Image`	ends_with	`\Microsoft\Teams\current\Teams.exe` corpus 2 (sigma 2)