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Detection rules › Sigma

Crypto Miner User Agent

Status
test
Severity
high
Log source
category proxy
Author
Florian Roth (Nextron Systems)
Source
github.com/SigmaHQ/sigma

Detects suspicious user agent strings used by crypto miners in proxy logs

MITRE ATT&CK coverage

TacticTechniques
Command & ControlT1071.001 Application Layer Protocol: Web Protocols

Rule body yaml

title: Crypto Miner User Agent
id: fa935401-513b-467b-81f4-f9e77aa0dd78
status: test
description: Detects suspicious user agent strings used by crypto miners in proxy logs
references:
    - https://github.com/xmrig/xmrig/blob/da22b3e6c45825f3ac1f208255126cb8585cd4fc/src/base/kernel/Platform_win.cpp#L65
    - https://github.com/xmrig/xmrig/blob/427b6516e0550200c17ca28675118f0fffcc323f/src/version.h
author: Florian Roth (Nextron Systems)
date: 2019-10-21
modified: 2021-11-27
tags:
    - attack.command-and-control
    - attack.t1071.001
logsource:
    category: proxy
detection:
    selection:
        c-useragent|startswith:
        # XMRig
            - 'XMRig '
        # CCMiner
            - 'ccminer'
    condition: selection
falsepositives:
    - Unknown
level: high

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    c-useragent|startswith:
        - 'XMRig '
        - 'ccminer'

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

FieldKindValues
c-useragentstarts_with
  • XMRig
  • ccminer