TA0009 · COLLECTION
Archive via Library
An adversary may compress or encrypt data that is collected prior to exfiltration using 3rd party libraries. Many libraries exist that can archive data, including Python rarfile , libzip , and zlib .
Detect it with
Monitor processes for accesses to known archival libraries. This may yield a significant number of benign events, depending on how systems in the environment are typically used.
Why it matters on shift
Archive via Library is one of the concrete ways adversaries achieve collection. 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 collection, the next tactic is usually Command and Control. Search your telemetry for the transition before closing the ticket.
Kill-chain context