commonly created Web shells on victims' publicly accessible email and web servers which they used to maintain access to a victim network and download additional malicious files.(Citation: US-CERT TA18-074A)
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request. ### Instruction: List the MITRE techniques contained in the text. ### Input: commonly created Web shells on victims' publicly accessible email and web servers which they used to maintain access to a victim network and download additional malicious files.(Citation: US-CERT TA18-074A) ### Response: T1505.003.