Explanation
Monitoring outbound traffic is a technique that can detect the behavior of malware that allows the unauthorized movement of data from a system. Outbound traffic refers to the data that leaves a system or network and goes to an external destination, such as another network, server, or website. Monitoring outbound traffic can help identify any suspicious or anomalous patterns, such as large volumes of data being sent to unknown or malicious destinations, which could indicate a malware infection or a data exfiltration attempt. Monitoring outbound traffic can also help prevent malware from communicating with command-and-control servers or downloading additional payloads101112 References: CompTIA Security+ SY0-601 Certification Study Guide, Chapter 11: Explaining Digital Forensics Concepts, page 496; Outbound Traffic Monitoring: Why It's Important for Your Network | SolarWinds MSP; How to Monitor Outbound Traffic on Your Network | NetFort Blog; Why You Should Monitor Outbound Traffic on Your Network | CSO Online

Explanation
Mimikatz is a tool that can extract plaintext credentials from memory on Windows systems. A malicious flash drive can bypass the GPO blocking the flash drives by using techniques such as autorun.inf or HID spoofing to execute Mimikatz on the target system without user interaction or consent. This can cause AV alerts indicating Mimikatz attempted to run on the remote systems and also reduce the storage capacity of the flash drives to only 512KB by creating hidden partitions or files on them.

Explanation
https://en.wikipedia.org/wiki/Phishing

Explanation
A replay attack is a type of network attack where an attacker captures and retransmits a valid data transmission, such as a login request, to gain unauthorized access or impersonate a legitimate user. In this case, the attacker may have captured the credentials of the app admin test account and used them to log in to the application. The application log shows multiple failed login attempts from different IP addresses, which indicates a replay attack.