<s>[INST] You are a cybersecurity and NLP expert tasked with named entity extraction. You need to provide the named entities for each token in the given sentence. You will be penalized for incorrect predictions. Identify the entities for the following sentence: 'Proofpoint researchers have observed a well-known Russian-speaking APT actor usually referred to as Turla using a new .NET/MSIL dropper for an existing backdoor called JS/KopiLuwak .' [/INST] [Proofpoint:B-SecTeam, researchers:O, have:O, observed:O, a:O, well-known:O, Russian-speaking:B-Area, APT:O, actor:O, usually:O, referred:O, to:O, as:O, Turla:B-HackOrg, using:O, a:O, new:O, .NET/MSIL:O, dropper:B-Tool, for:O, an:O, existing:O, backdoor:O, called:O, JS/KopiLuwak:B-SamFile, .:O] </s>