Most of the information here is for Warzone 3.1 and above.
sub1_7pl transcript
- Aubergine
Owned by Aubergine
Overview
This mission objective gives some indication as to when NEXUS Intruder Program started infecting post-collapse factions' computer systems.File location
  sequences.wz / sequences / cam1 / sub1_7pl.ogg
Sequence
Commander, we have a new objective for you.
Having analysed the computer systems recovered from the New Paradigm we have detected and isolated an Intruder Program identical to one that infected our systems at Project HQ 3 months ago.
This program has been identified as the NEXUS Intruder Program.
It appears to have entered New Paradigm's systems at the same time it attempted to enter ours.