General

Find the sites

Winter Nexus data-hacking signatures spawn in systems affected by volatile ice storms in HS, LS and NS.
LS sites are assumed to be the most valuable ones, followed by NS and then HS.

Difficulty

HS sites can be upgraded by depositing a Cryostatic Estimator (from Yoiul LADs)LADs) into Sansha's Stormfield Projector, upgrading the site (increased difficulty & better loot)

LS sites can be upgraded with a Cryostatic Nullifier

NS sites can be upgraded with a Cryostatic Suppressor