macOS Installer Spawns Network Event
editmacOS Installer Spawns Network Event
editIdentifies when the built in macOS Installer program generates a network event after attempting to install a .pkg file. This activity has been observed being leveraged by malware.
Rule type: eql
Rule indices:
- logs-endpoint.events.*
Severity: medium
Risk score: 47
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
- Execution
Version: 3 (version history)
Added (Elastic Stack release): 7.12.0
Last modified (Elastic Stack release): 7.15.0
Rule authors: Elastic
Rule license: Elastic License v2
Potential false positives
editCustom organization-specific macOS packages that use .pkg files to run cURL could trigger this rule. If known behavior is causing false positives, it can be excluded from the rule.
Rule query
editsequence by process.entity_id with maxspan=1m [process where
event.type == "start" and host.os.family == "macos" and
process.parent.executable in ("/usr/sbin/installer",
"/System/Library/CoreServices/Installer.app/Contents/MacOS/Installer")
] [network where not cidrmatch(destination.ip, "10.0.0.0/8",
"127.0.0.0/8", "169.254.0.0/16", "172.16.0.0/12", "192.0.0.0/24",
"192.0.0.0/29", "192.0.0.8/32", "192.0.0.9/32", "192.0.0.10/32",
"192.0.0.170/32", "192.0.0.171/32", "192.0.2.0/24", "192.31.196.0/24",
"192.52.193.0/24", "192.168.0.0/16", "192.88.99.0/24", "224.0.0.0/4",
"100.64.0.0/10", "192.175.48.0/24", "198.18.0.0/15",
"198.51.100.0/24", "203.0.113.0/24", "240.0.0.0/4", "::1",
"FE80::/10", "FF00::/8")]
Threat mapping
editFramework: 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/
-
Tactic:
- Name: Command and Control
- ID: TA0011
- Reference URL: https://attack.mitre.org/tactics/TA0011/
-
Technique:
- Name: Application Layer Protocol
- ID: T1071
- Reference URL: https://attack.mitre.org/techniques/T1071/
Rule version history
edit- Version 3 (7.15.0 release)
-
- Formatting only
- Version 2 (7.14.0 release)
-
-
Updated query, changed from:
sequence by process.entity_id with maxspan=1m [ process where event.type == "start" and host.os.family == "macos" and process.parent.executable in ("/usr/sbin/installer", "/System/Library/CoreServices/Installer.app/Contents/MacOS/Installer") ] [ network where not cidrmatch(destination.ip, "192.168.0.0/16", "10.0.0.0/8", "172.16.0.0/12", "224.0.0.0/8", "127.0.0.0/8", "169.254.0.0/16", "::1", "FE80::/10", "FF00::/8") ]
-