MacOS Installer Package Spawns Network Event
editMacOS Installer Package Spawns Network Event
editDetects the execution of a MacOS installer package with an abnormal child process (e.g bash) followed immediately by a network connection via a suspicious process (e.g curl). Threat actors will build and distribute malicious MacOS installer packages, which have a .pkg extension, many times imitating valid software in order to persuade and infect their victims often using the package files (e.g pre/post install scripts etc.) to download additional tools or malicious software. If this rule fires it should indicate the installation of a malicious or suspicious package.
Rule type: eql
Rule indices:
- logs-endpoint.events.*
Severity: medium
Risk score: 47
Runs every: 5m
Searches indices from: now-9m (Date Math format, see also Additional look-back time
)
Maximum alerts per execution: 100
References:
Tags:
- Domain: Endpoint
- OS: macOS
- Use Case: Threat Detection
- Tactic: Execution
- Tactic: Command and Control
- Data Source: Elastic Defend
Version: 105
Rule authors:
- Elastic
Rule license: Elastic License v2
Rule query
editsequence by host.id, user.id with maxspan=30s [process where host.os.type == "macos" and event.type == "start" and event.action == "exec" and process.parent.name : ("installer", "package_script_service") and process.name : ("bash", "sh", "zsh", "python", "osascript", "tclsh*")] [network where host.os.type == "macos" and event.type == "start" and process.name : ("curl", "osascript", "wget", "python")]
Framework: MITRE ATT&CKTM
-
Tactic:
- Name: Execution
- ID: TA0002
- Reference URL: https://attack.mitre.org/tactics/TA0002/
-
Technique:
- Name: Command and Scripting Interpreter
- ID: T1059
- Reference URL: https://attack.mitre.org/techniques/T1059/
-
Sub-technique:
- Name: JavaScript
- ID: T1059.007
- Reference URL: https://attack.mitre.org/techniques/T1059/007/
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Tactic:
- Name: Command and Control
- ID: TA0011
- Reference URL: https://attack.mitre.org/tactics/TA0011/
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Technique:
- Name: Application Layer Protocol
- ID: T1071
- Reference URL: https://attack.mitre.org/techniques/T1071/
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Sub-technique:
- Name: Web Protocols
- ID: T1071.001
- Reference URL: https://attack.mitre.org/techniques/T1071/001/