HarfangLab and SentinelOne both send the process that acted to actor.* —
process.username and sourceProcessInfo.user to actor.user.name, the process
itself to actor.process.* — and keep user.name for the person the event
happened to: HarfangLab's top_impacted_users, SentinelOne's login account.
Cortex XDR filled neither slot correctly. XDR labels the acting process
actor_process_* and its account actor_effective_username; the mappers sent
the process to process.* and the account to user.name, which the OCSF
catalogue calls Target User. A rule written on actor.user.name or
actor.process.name matched HarfangLab and SentinelOne and skipped Cortex,
and a rule reading user.name as the victim read the attacker.
process.* is not free-for-all either: in the SentinelOne (targetProcessInfo)
and Carbon Black (childproc_*) mappers it holds the process acted upon, so
Cortex's actor was sitting in the target's seat.
get_incidents_full had the collision in the open: the incident's impacted
users[] and the first alert's user_name both wrote user.name, and last
non-empty wins, so the actor overwrote the impacted user on every incident
carrying both.
Tenants using the shipped templates pick this up on the next sync; a forked
mapper, or a column or rule pointed at the old Cortex paths, needs repointing.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
f3nris
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