High-Risk Authentication to Laptop-Farm, Freelance, or Recruitment-Adjacent Services (WaterPlum IP-Reuse Feed)
Flags individual authentication events against services WaterPlum/North Korean IT worker operations are known to touch (laptop-farm remote-access tooling, freelance/crowdsourcing platforms, job-application and recruitment portals). This rule matches on a SINGLE qualifying event and does not itself prove IP reuse across contexts -- this Sigma dialect has no native cross-event correlation construct, so confirming that the SAME source IP appears across two or more of these categories (the actual WaterPlum indicator reported by investigators) requires a downstream correlation search, SOAR playbook, or UEBA rule that groups these flagged events by SourceIp over a rolling window.
Sigma
