Backdoor.Andromeda is the generic detection for Trojans of the Andromeda family. There are many variants that all allow remote, unauthorized access to a system. Threat actors have a variety of modules at their disposal that can install other malware or steal information from the affected system.
Common infection method
This backdoor is usually spread by malicious email attachments or by exploit kits.
Malwarebytes can remove Backdoor.Andromeda without further user interaction. In case of active infection, it is imperative to find out if (and what) information have been stolen, so you can take countermeasures, such as changing passwords.