Detection rules › Elastic
Web Browser Credential Data Accessed by Osascript
Detects when Osascript is seen accessing sensitive web browser files. Adversaries may steal credentials from web browsers by reading files specific to the target browser.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Credential Access |
Telemetry coverage
| Platform | Record / event type |
|---|---|
| macOS | ESF event open (NOTIFY): Fires after the kernel grants a process access to open a file. |
Rule body
[rule]
description = """
Detects when Osascript is seen accessing sensitive web browser files. Adversaries may steal credentials from web
browsers by reading files specific to the target browser.
"""
id = "9885462e-e551-4d61-91ad-1e76ec67a040"
license = "Elastic License v2"
name = "Web Browser Credential Data Accessed by Osascript"
os_list = ["macos"]
version = "1.0.6"
query = '''
file where event.action == "open" and process.name == "osascript" and
file.name like~ ("cookies.sqlite",
"key?.db",
"logins.json",
"Cookies",
"Cookies.binarycookies",
"Login Data")
'''
min_endpoint_version = "8.10.2"
optional_actions = []
[[actions]]
action = "kill_process"
field = "process.entity_id"
state = 0
[[threat]]
framework = "MITRE ATT&CK"
[[threat.technique]]
id = "T1539"
name = "Steal Web Session Cookie"
reference = "https://attack.mitre.org/techniques/T1539/"
[[threat.technique]]
id = "T1555"
name = "Credentials from Password Stores"
reference = "https://attack.mitre.org/techniques/T1555/"
[[threat.technique.subtechnique]]
id = "T1555.003"
name = "Credentials from Web Browsers"
reference = "https://attack.mitre.org/techniques/T1555/003/"
[threat.tactic]
id = "TA0006"
name = "Credential Access"
reference = "https://attack.mitre.org/tactics/TA0006/"
[internal]
min_endpoint_version = "8.10.2"
Stages and Predicates
Stage 1: file
file where event.action == "open" and process.name == "osascript" and
file.name like~ ("cookies.sqlite",
"key?.db",
"logins.json",
"Cookies",
"Cookies.binarycookies",
"Login Data")
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
event.action | eq |
| field:"EventType" kind:eq value:"open" |
file.name | wildcard |
| field:"file.name" kind:wildcard |
process.name | eq |
| field:"process_name" kind:eq value:"osascript" |