has used a modified and obfuscated version of the reGeorg web shell to maintain persistence on a target's Outlook Web Access (OWA) server.
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: has used a modified and obfuscated version of the reGeorg web shell to maintain persistence on a target's Outlook Web Access (OWA) server. ### Response: T1505.003.