Suspicious activity report

In financial regulation, a suspicious activity report (SAR) or suspicious transaction report (STR) is a report made by a financial institution about suspicious or potentially suspicious activity as required under laws designed to counter money laundering, financing of terrorism and other financial crimes. The criteria for when a report is required vary by country, but in general, a report is made when a financial transaction does not make sense to the financial institution, appears unusual for that particular client, or appears to be hiding or obfuscating a different transaction.

Source: Wikipedia — Suspicious activity report (CC BY-SA 4.0)