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Suspicious Browser Child Process

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Suspicious Browser Child Process

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Identifies the execution of a suspicious browser child process. Adversaries may gain access to a system through a user visiting a website over the normal course of browsing. With this technique, the user’s web browser is typically targeted for exploitation.

Rule type: eql

Rule indices:

logs-endpoint.events.*

Severity: high

Risk score: 73

Runs every: 5 minutes

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

Elastic
Host
macOS
Threat Detection
Initial Access
Execution

Version: 100 (version history)

Added (Elastic Stack release): 7.12.0

Last modified (Elastic Stack release): 8.5.0

Rule authors: Elastic

Rule license: Elastic License v2

Rule query

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process where event.type in ("start", "process_started") and
process.parent.name : ("Google Chrome", "Google Chrome Helper*",
"firefox", "Opera", "Safari", "com.apple.WebKit.WebContent",
"Microsoft Edge") and process.name : ("sh", "bash", "dash", "ksh",
"tcsh", "zsh", "curl", "wget", "python*", "perl*", "php*",
"osascript", "pwsh") and process.command_line != null and not
process.command_line : "*/Library/Application
Support/Microsoft/MAU*/Microsoft
AutoUpdate.app/Contents/MacOS/msupdate*" and not process.args :
( "hw.model", "IOPlatformExpertDevice",
"/Volumes/Google Chrome/Google
Chrome.app/Contents/Frameworks/*/Resources/install.sh", "--
defaults-torrc", "*Chrome.app", "Framework.framework/Versi
ons/*/Resources/keystone_promote_preflight.sh",
"/Users/*/Library/Application
Support/Google/Chrome/recovery/*/ChromeRecovery", "$DISPLAY",
"*GIO_LAUNCHED_DESKTOP_FILE_PID=$$*", "/opt/homebrew/*",
"/usr/local/*brew*" )

Threat mapping

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Framework: MITRE ATT&CK^TM

Tactic:
- Name: Execution
- ID: TA0002
- Reference URL: https://attack.mitre.org/tactics/TA0002/
Technique:
- Name: Exploitation for Client Execution
- ID: T1203
- Reference URL: https://attack.mitre.org/techniques/T1203/
Tactic:
- Name: Initial Access
- ID: TA0001
- Reference URL: https://attack.mitre.org/tactics/TA0001/
Technique:
- Name: Drive-by Compromise
- ID: T1189
- Reference URL: https://attack.mitre.org/techniques/T1189/

Rule version history

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Version 100 (8.5.0 release)

Updated query, changed from:

process where event.type in ("start", "process_started") and
process.parent.name : ("Google Chrome", "Google Chrome Helper*",
"firefox", "Opera", "Safari", "com.apple.WebKit.WebContent",
"Microsoft Edge") and process.name : ("sh", "bash", "dash", "ksh",
"tcsh", "zsh", "curl", "wget", "python*", "perl*", "php*",
"osascript", "pwsh") and process.command_line != null and not
process.args : ( "/Library/Application
Support/Microsoft/MAU*/Microsoft
AutoUpdate.app/Contents/MacOS/msupdate", "hw.model",
"IOPlatformExpertDevice", "/Volumes/Google Chrome/Google
Chrome.app/Contents/Frameworks/*/Resources/install.sh", "--
defaults-torrc", "Chrome.app", "Framework.framework/Vers
ions/*/Resources/keystone_promote_preflight.sh",
"/Users/*/Library/Application
Support/Google/Chrome/recovery/*/ChromeRecovery", "$DISPLAY",
"GIO_LAUNCHED_DESKTOP_FILE_PID=$$" )

Version 2 (8.4.0 release)

Formatting only

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