Triple Cross eBPF Rootkit Default Persistence

Status: test
Severity: high
Log source: category file_event, product linux
Author: Nasreddine Bencherchali (Nextron Systems)
Source: github.com/SigmaHQ/sigma

Detects the creation of "ebpfbackdoor" files in both "cron.d" and "sudoers.d" directories. Which both are related to the TripleCross persistence method

Known false positives

Unlikely

MITRE ATT&CK coverage

Tactic	Techniques
Execution	`T1053.003` Scheduled Task/Job: Cron
Persistence	`T1053.003` Scheduled Task/Job: Cron
Privilege Escalation	`T1053.003` Scheduled Task/Job: Cron

Telemetry coverage

Platform	Record / event type
Linux	Event ID 11: File created

Rule body

title: Triple Cross eBPF Rootkit Default Persistence
id: 1a2ea919-d11d-4d1e-8535-06cda13be20f
status: test
description: Detects the creation of "ebpfbackdoor" files in both "cron.d" and "sudoers.d" directories. Which both are related to the TripleCross persistence method
references:
    - https://github.com/h3xduck/TripleCross/blob/12629558b8b0a27a5488a0b98f1ea7042e76f8ab/apps/deployer.sh
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-07-05
modified: 2022-12-31
tags:
    - attack.privilege-escalation
    - attack.execution
    - attack.persistence
    - attack.t1053.003
logsource:
    product: linux
    category: file_event
detection:
    selection:
        TargetFilename|endswith: 'ebpfbackdoor'
    condition: selection
falsepositives:
    - Unlikely
level: high

Stages and Predicates

Stage 0: `condition`

selection

Stage 1: `selection`

selection:
    TargetFilename|endswith: 'ebpfbackdoor'

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`TargetFilename`	ends_with	`ebpfbackdoor`	`field:"TargetFilename" kind:ends_with value:"ebpfbackdoor"`