Suspicious Where Execution

Status: test
Severity: low
Log source: category process_creation, product windows
Author: frack113, Nasreddine Bencherchali (Nextron Systems)
Source: github.com/SigmaHQ/sigma

Adversaries may enumerate browser bookmarks to learn more about compromised hosts. Browser bookmarks may reveal personal information about users (ex: banking sites, interests, social media, etc.) as well as details about internal network resources such as servers, tools/dashboards, or other related infrastructure.

MITRE ATT&CK coverage

Tactic	Techniques
Discovery	`T1217` Browser Information Discovery

Telemetry coverage

Provider	Record / event type
Sysmon	Event ID 1: Process creation

Rule body

title: Suspicious Where Execution
id: 725a9768-0f5e-4cb3-aec2-bc5719c6831a
status: test
description: |
    Adversaries may enumerate browser bookmarks to learn more about compromised hosts.
    Browser bookmarks may reveal personal information about users (ex: banking sites, interests, social media, etc.) as well as details about
    internal network resources such as servers, tools/dashboards, or other related infrastructure.
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1217/T1217.md
author: frack113, Nasreddine Bencherchali (Nextron Systems)
date: 2021-12-13
modified: 2022-06-29
tags:
    - attack.discovery
    - attack.t1217
logsource:
    category: process_creation
    product: windows
detection:
    where_exe:
        - Image|endswith: '\where.exe'
        - OriginalFileName: 'where.exe'
    where_opt:
        CommandLine|contains:
            # Firefox Data
            - 'places.sqlite'
            - 'cookies.sqlite'
            - 'formhistory.sqlite'
            - 'logins.json'
            - 'key4.db'
            - 'key3.db'
            - 'sessionstore.jsonlz4'
            # Chrome Data
            - 'History'
            - 'Bookmarks'
            - 'Cookies'
            - 'Login Data'
    condition: all of where_*
falsepositives:
    - Unknown
level: low

Stages and Predicates

Stage 0: `condition`

all of where_*

Stage 1: `where_exe`

where_exe:
    - Image|endswith: '\where.exe'
    - OriginalFileName: 'where.exe'

Stage 2: `where_opt`

where_opt:
    CommandLine|contains:
        - 'places.sqlite'
        - 'cookies.sqlite'
        - 'formhistory.sqlite'
        - 'logins.json'
        - 'key4.db'
        - 'key3.db'
        - 'sessionstore.jsonlz4'
        - 'History'
        - 'Bookmarks'
        - 'Cookies'
        - 'Login Data'

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`CommandLine`	match	`Bookmarks` corpus 2 (sigma 2) `Cookies` corpus 2 (sigma 2) `History` corpus 2 (sigma 2) `Login Data` corpus 3 (sigma 2, panther 1) `cookies.sqlite` corpus 3 (sigma 2, panther 1) `formhistory.sqlite` `key3.db` corpus 2 (sigma 1, panther 1) `key4.db` corpus 2 (sigma 1, panther 1) `logins.json` corpus 2 (sigma 1, panther 1) `places.sqlite` corpus 2 (sigma 2) `sessionstore.jsonlz4`	`field:"CommandLine" kind:match`
`Image`	ends_with	`\where.exe`	`field:"Image" kind:ends_with value:"\where.exe"`
`OriginalFileName`	eq	`where.exe`	`field:"OriginalFileName" kind:eq value:"where.exe"`