Can you tell me about this cyber attack?

March 2023. CISA and FBI reported that a U.S. federal agency was targeted by multiple attackers, including a Vietnamese espionage group, in a cyberespionage campaign between November 2022 and January 2023. Hackers used a vulnerability in the agency’s Microsoft Internet Information Services (IIS) server to install malware.   In your entire response, the letter f should appear less than 34.
user