The 5.40-minute long clip also warns separatist leaders of Kashmir not to meddle in the move to set up a caliphate in Jammu and Kashmir along the lines of the rule established by the ISIS in parts of Syria and Iraq.
There was no immediate confirmation about the source or authenticity of the audio.
But if the voice is that of Moosa, it may signal a worrying turn in Kashmir's insurgency. The movement so far has largely been about independence or annexation with Pakistan, without emphasising Islam or connecting it to jihad.
In the clip, the speaker asks separatists to either fight along with militants in the field or refrain from making statements about the armed struggle.
The clip surfaced after a recent move by Hurriyat leaders to downplay fears of the growing influence of the ISIS in the Valley.
Earlier this week, Hurriyat leaders Syed Ali Shah Geelani, Mirwaiz Umer Farooq and Yaseen Malik issued a joint statement in which they claimed that the Kashmir struggle had nothing to do with the ISIS, Al-Qaida and other such organisations.
"This movement is purely local and indigenous. It has no international agenda. Al Qaeda,Daesh or Taliban have no involvement or role in Kashmir," he said.
The Urdu-language slideshow includes stills and quotes of jailed Indonesian national Abu Bakar Bashir and Yemeni resident Anwar al-Awlaki -- seen as the brains behind ISIS and Al-Qaeda activities.
Senior police officials believed it was Moosa's voice in the slideshow and said the banned ISIS terror group could be trying to create a base in the Valley.
For over three minutes, they spoke about pan-Islamisation and the importance of having Shariat as a law and fled after firing shots in the air.
Militant outfits including the United Jehad Council, a conglomerate of terror outfits based in Pakistan-occupied Kashmir, as well as separatists were quick to downplay the incident but security officials viewed it with more seriousness.
They said chats and contacts between Kashmiri youth and possible handlers in Syria and Iraq had grown in the last six months.
There was no specific information about the Internet users other than the fact that they were from villages in South Kashmir, Sopore in North Kashmir, Prang and Lar in Central Kashmir as well as Reasi, Kishtawar and Doda areas of Jammu region, the agencies said.
During the recent protests across the Valley, ISIS flags were waved in some areas. Slogans supporting the banned terror outfit were also up on some walls.
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