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Communication To Ngrok Tunneling Service - Linux

Detects an executable accessing an ngrok tunneling endpoint, which could be a sign of forbidden exfiltration of data exfiltration by malicious actors

MITRE ATT&CK

T1567 T1568.002 T1572 T1090 T1102 S0508

exfiltrationcommand-and-control

Detection Query

selection:
  DestinationHostname|contains:
    - tunnel.us.ngrok.com
    - tunnel.eu.ngrok.com
    - tunnel.ap.ngrok.com
    - tunnel.au.ngrok.com
    - tunnel.sa.ngrok.com
    - tunnel.jp.ngrok.com
    - tunnel.in.ngrok.com
condition: selection

Author

Florian Roth (Nextron Systems)

Created

2022-11-03

Data Sources

linuxNetwork Connection Events

Platforms

linux

References

Tags

attack.exfiltrationattack.command-and-controlattack.t1567attack.t1568.002attack.t1572attack.t1090attack.t1102attack.s0508

Raw Content

title: Communication To Ngrok Tunneling Service - Linux
id: 19bf6fdb-7721-4f3d-867f-53467f6a5db6
status: test
description: Detects an executable accessing an ngrok tunneling endpoint, which could be a sign of forbidden exfiltration of data exfiltration by malicious actors
references:
    - https://twitter.com/hakluke/status/1587733971814977537/photo/1
    - https://ngrok.com/docs/secure-tunnels/tunnels/ssh-reverse-tunnel-agent
author: Florian Roth (Nextron Systems)
date: 2022-11-03
tags:
    - attack.exfiltration
    - attack.command-and-control
    - attack.t1567
    - attack.t1568.002
    - attack.t1572
    - attack.t1090
    - attack.t1102
    - attack.s0508
logsource:
    product: linux
    category: network_connection
detection:
    selection:
        DestinationHostname|contains:
            - 'tunnel.us.ngrok.com'
            - 'tunnel.eu.ngrok.com'
            - 'tunnel.ap.ngrok.com'
            - 'tunnel.au.ngrok.com'
            - 'tunnel.sa.ngrok.com'
            - 'tunnel.jp.ngrok.com'
            - 'tunnel.in.ngrok.com'
    condition: selection
falsepositives:
    - Legitimate use of ngrok
level: high