The Institute for the Study of War (ISW) said the radical group was preparing for a global surge of activities before and during the Ramadan, which falls between June 6 and July 5.
"ISIS continued to pursue its regional campaign objectives of establishing affiliates and increasing disorder throughout historically Muslim lands," ISW said.
Earlier, in its online magazine, 'Dabiq', the ISIS said they had found a leader for the Bengal region.
But the Bangladesh government has denied presence of ISIS in the country.
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The group claimed responsibility for the gruesome April 23 murder of English professor Rezaul Karim Siddique, who was hacked to death in northwest Bangladesh.
Since September 2015, the ISIS has claimed responsibility for eight brutal attacks in Bangladesh.
In February, a head priest was killed at a Hindu temple in an area bordering India, the first attack claimed by the ISIS targeting the community.