has used spearphishing emails with an attachment to deliver files with exploits to initial victims.(Citation: F-Secure The Dukes)(Citation: FireEye APT29 Nov 2018)(Citation: ESET Dukes October 2019)(Citation: MSTIC NOBELIUM May 2021)(Citation: ESET T3 Threat Report 2021)
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 spearphishing emails with an attachment to deliver files with exploits to initial victims.(Citation: F-Secure The Dukes)(Citation: FireEye APT29 Nov 2018)(Citation: ESET Dukes October 2019)(Citation: MSTIC NOBELIUM May 2021)(Citation: ESET T3 Threat Report 2021) ### Response: T1566.001.