[SignatureBot] Add or update signature dnsreaper_campaign_monitor.yml

[liquidsec]

Add or update signature: dnsreaper_campaign_monitor.yml

This PR adds or updates the follow signature:

identifiers:
  cnames:
  - type: word
    value: campaignmonitor.com
  ips: []
  nameservers: []
  not_cnames: []
matcher_rule:
  matchers:
  - condition: or
    part: body
    type: word
    words:
    - WHOOPS! The page you're looking for does not exist.
  matchers-condition: and
mode: http
service_name: campaignmonitor.com
source: dnsreaper

[liquidsec]

Test results:

Signature Pass: false ❌
Error: No CNAMES passed random subdomain matcher validation

[liquidsec]

Test results:

Signature Pass: true ✔️

Match Table:

Domain	Match
campaignmonitor.com	true