TA0043 · RECONNAISSANCE
Scanning IP Blocks
Adversaries may scan victim IP blocks to gather information that can be used during targeting. Public IP addresses may be allocated to organizations by block, or a range of sequential addresses.
Detect it with
Monitor for suspicious network traffic that could be indicative of scanning, such as large quantities originating from a single source (especially if the source is known to be associated with an adversary/botnet).
Why it matters on shift
Scanning IP Blocks is one of the concrete ways adversaries achieve reconnaissance. Recognising it in telemetry lets you name the technique in your ticket and pivot to what came before and after.
What to look for next
After reconnaissance, the next tactic is usually Resource Development. Search your telemetry for the transition before closing the ticket.
Kill-chain context