BPF filter applied using TCedit
Detects when the tc (transmission control) binary is utilized to set a BPF (Berkeley Packet Filter) on a network interface. Tc is used to configure Traffic Control in the Linux kernel. It can shape, schedule, police and drop traffic. A threat actor can utilize tc to set a bpf filter on an interface for the purpose of manipulating the incoming traffic. This technique is not at all common and should indicate abnormal, suspicious or malicious activity.
Rule type: eql
Rule indices:
- logs-endpoint.events.*
- endgame-*
Severity: high
Risk score: 73
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: Linux
- Use Case: Threat Detection
- Tactic: Execution
- Threat: TripleCross
- Data Source: Elastic Endgame
- Data Source: Elastic Defend
Version: 107
Rule authors:
- Elastic
Rule license: Elastic License v2
Rule queryedit
process where host.os.type == "linux" and event.type != "end" and process.executable : "/usr/sbin/tc" and process.args : "filter" and process.args : "add" and process.args : "bpf" and not process.parent.executable: "/usr/sbin/libvirtd"
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: Unix Shell
- ID: T1059.004
- Reference URL: https://attack.mitre.org/techniques/T1059/004/