ATT&CK coverage › Technique

Browser Information Discovery `T1217`

Adversaries may enumerate information about browsers to learn more about compromised environments. Data saved by browsers (such as bookmarks, accounts, and browsing history) may reveal a variety of personal information about users (e.g., banking sites, relationships/interests, social media, etc.) as well as details about internal network resources such as servers, tools/dashboards, or other related infrastructure.

Events covered

3 catalog events are tagged with this technique by at least one rule.

Provider	Event ID	Title
Sysmon	1	Process creation
Security-Auditing	4688	A new process has been created.
PowerShell	4104	Creating Scriptblock text (MessageNumber of MessageTotal).

Authoring guide

Patterns shared across the 4 rules above: which fields they filter on, what specific values they look for, and what they exclude. Field names are normalized across vendors so Sigma's Image, Elastic's process.name, and Splunk's process_name collapse into one row. Each rule contributes at most once per row.

Fields filtered most (4 distinct)

The fields most rules look at when detecting this technique. The How column shows the operators authors use (eq, wildcard, regex_match, match) and how often each appears. Sample values are concrete examples to start from, not an exhaustive list.

Field	Rules	How	Sample values
`Image`	2	`ends_with` 2	`\cmd.exe`, `\where.exe`
`OriginalFileName`	2	`eq` 2	`Cmd.Exe`, `where.exe`
`CommandLine`	2	`match` 2	`dir*-s`, `key3.db`, `logins.json`, `sessionstore.jsonlz4`
`ScriptBlockText`	1	`match` 1	`-Filter Bookmarks`, `-Recurse` , `-ErrorAction SilentlyContinue`

Top indicator values (22 distinct)

Specific (field, operator, value) combinations the rules check for, ranked by how many rules under this technique use each one. The Corpus reach column counts how many rules across the entire catalog (any technique) check the same combination. High numbers point to widely-used indicators that are likely noisy on their own; combine them with another condition for useful signal. Blank means the combination is specific to rules under this technique.

Field	Kind	Value	Rules (here)	Corpus reach
`ScriptBlockText`	`match`	`-Force`	1
`ScriptBlockText`	`match`	`-Filter Bookmarks`	1
`ScriptBlockText`	`match`	`-Path`	1
`ScriptBlockText`	`match`	`-ErrorAction SilentlyContinue`	1
`ScriptBlockText`	`match`	`-Recurse`	1	2
`ScriptBlockText`	`match`	`Get-ChildItem`	1	3
`Image`	`ends_with`	`\cmd.exe`	1	92
`CommandLine`	`match`	`dir*-s`	1
`OriginalFileName`	`eq`	`Cmd.Exe`	1	32
`CommandLine`	`match`	`logins.json`	1
`Image`	`ends_with`	`\where.exe`	1
`CommandLine`	`match`	`places.sqlite`	1	2
`CommandLine`	`match`	`sessionstore.jsonlz4`	1
`CommandLine`	`match`	`Bookmarks`	1	2
`CommandLine`	`match`	`Cookies`	1	2
`CommandLine`	`match`	`Login Data`	1	2
`CommandLine`	`match`	`cookies.sqlite`	1	2
`CommandLine`	`match`	`key4.db`	1
`CommandLine`	`match`	`key3.db`	1
`OriginalFileName`	`eq`	`where.exe`	1

Rules under this technique

Every rule in the catalog tagged with this technique, grouped by vendor. Click a rule title for its full predicates, exclusions, and indicators.

Sigma 3 rules

Automated Collection Bookmarks Using Get-ChildItem PowerShell severity low, 1 event, 6 indicators, 0 exclusions
File And SubFolder Enumeration Via Dir Command severity low, 1 event, 3 indicators, 0 exclusions
Suspicious Where Execution severity low, 1 event, 13 indicators, 0 exclusions

Kusto Query Language 1 rule

Powershell Empire Cmdlets Executed in Command Line 1 event, 0 indicators, 0 exclusions

Browser Information Discovery T1217