BPFtrace Unsafe Option Usage

Status: test
Severity: medium
Log source: category process_creation, product linux
Author: Andreas Hunkeler (@Karneades)
Source: github.com/SigmaHQ/sigma

Detects the usage of the unsafe bpftrace option

Known false positives

Legitimate usage of the unsafe option

MITRE ATT&CK coverage

Tactic	Techniques
Execution	`T1059.004` Command and Scripting Interpreter: Unix Shell

Telemetry coverage

Platform	Record / event type
Linux	Event ID 1: Process Create

Rule body

title: BPFtrace Unsafe Option Usage
id: f8341cb2-ee25-43fa-a975-d8a5a9714b39
status: test
description: Detects the usage of the unsafe bpftrace option
references:
    - https://embracethered.com/blog/posts/2021/offensive-bpf-bpftrace/
    - https://bpftrace.org/
author: Andreas Hunkeler (@Karneades)
date: 2022-02-11
tags:
    - attack.execution
    - attack.t1059.004
logsource:
    category: process_creation
    product: linux
detection:
    selection:
        Image|endswith: 'bpftrace'
        CommandLine|contains: '--unsafe'
    condition: selection
falsepositives:
    - Legitimate usage of the unsafe option
level: medium

Stages and Predicates

Stage 0: `condition`

selection

Stage 1: `selection`

selection:
    Image|endswith: 'bpftrace'
    CommandLine|contains: '--unsafe'

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`CommandLine`	match	`--unsafe`	`field:"CommandLine" kind:match value:"--unsafe"`
`Image`	ends_with	`bpftrace`	`field:"Image" kind:ends_with value:"bpftrace"`

BPFtrace Unsafe Option Usage

Known false positives

MITRE ATT&CK coverage

Telemetry coverage

Rule body

Stages and Predicates

Stage 0: condition

Stage 1: selection

Indicators

Stage 0: `condition`

Stage 1: `selection`